Iranian Classification Society Rules

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SURVEY PLANNING QUESTIONNAIRE image


The following information will enable the Owner in co-operation with the Society to develop a survey programme complying with the requirements of the Rules. It is essential that the Owner provides, when

completing the present questionnaire, up-to-date information. provide all information and material required by the Rules.

The present questionnaire, when completed, is to


Basic information and particulars


Name of ship :


Class No. :


IMO No. :

Class Notation :


Flag State :


Port of registry :


Gross tonnage :


Deadweight(metric tones) :


Length between perpendiculars(m) :


Shipbuilder :


Hull number :


Date of delivery of the ship :


Date of build / major conversion :


/


Owner :


Thickness measurement company :


Owner's representative :


Signature


Name

( Place / Date )


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Guidance Relating to the Rules for the Classification of Steel Ships 2015 117

Pt 1 Classification and Surveys

Annex 1-3 Example of the Survey Programme and the Survey Planning Questionnaire Pt 1, Annex 1-3

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SURVEY PLANNING QUESTIONNAIRE


1. Information on access provisions for Close-up Surveys and thickness measurement

The Owner is to indicate, in the table below, the means of access to the structures subject to Close-up Survey and thickness measurement. A Close-up Survey is an examination where the details of structural components are within the close visual inspection range of the attending Surveyor, i.e. normally within reach of hand.



Hold/Tank/ Space


Structure*


C(Cargo)/ B(Ballast)


Access provisions

Permanent Means of Access


Temporary staging


Rafts/Boats


Ladders


Direct access

Other means (please specify)

* Each structural components which have different type of access provisions are to be specified.

(e.g. Fore peak/Aft peak/Under deck/Side shell/Bottom transverse/Longitudinal/Transverse/Hatch side coamings/Topside slopping plate/Upper stool plating/Cross deck/Side shell, frames & brackets/Transverse bulkhead/Hopper slopping plating/Lower stool/Tank top/Double bottom structure/Upper stool internal structure/Lower stool internal structure, etc.)


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History of bulk cargoes of a corrosive nature(e.g. high sulphur content) /

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History of cargo with H2S content or heated cargo for the last 3 years together with indication as to whether cargo was heated and, where available, Marine Safety Data Sheets(MSDS)*


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* Refer to resolution MSC.150(70) on Recommendation for material safety data sheets for MARPOL Annex I cargoes and marine fuel oils.


118 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-3 Example of the Survey Programme and the Survey Planning Questionnaire Pt 1, Annex 1-3

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SURVEY PLANNING QUESTIONNAIRE


2. Owner's inspections


Using a format similar to that of the table below (which is given as an example), the Owner is to provide details of the results of their inspections for the last 3 years on all cargo holds/tanks, ballast tanks and void spaces within the cargo (length) area, including peak tanks.


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Hold/Tank/Space Use

Corrosion

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prevention system (1)


Coating extent (2)


Coating condition (3)


Structural deterioration (4)


Hold/tank/space history

(5)


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(1) HC=hard coating,

(2) U=upper part,

(3) G=good,

SC=soft coating, M=middle part, F=fair,

SH=semi-hard coating, L=lower part,

P=poor,

NP=no prevention C=complete

RC=recoated(during the last 3 years)

(4) N=no findings recorded,

Y=findings recorded, description of findings is to be attached to the questionnaire

(5) DR=damage & repair, L=leakages,

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CV=conversion(description is to be attached to the questionnaire)


Owner's representative :


Signature


Name

( Place / Date )


Guidance Relating to the Rules for the Classification of Steel Ships 2015 119

Pt 1 Classification and Surveys

Annex 1-3 Example of the Survey Programme and the Survey Planning Questionnaire Pt 1, Annex 1-3

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SURVEY PLANNING QUESTIONNAIRE


3. Reports of Port State Control inspections


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List the reports of Port State Control inspections containing hull structural related deficiencies and relevant information on rectification of the deficiencies:


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4. Safety Management System


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List non-conformities related to hull maintenance, including the associated corrective actions:


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5. Name and address of the approved thickness measurement company


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Name Address Approved by


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120 Guidance Relating to the Rules for the Classification of Steel Ships 2015

Pt 1 Classification and Surveys

Annex 1-4 Owners Inspection Report Pt 1, Annex 1-4

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Annex 1-4 Owners Inspection Report


The Owner of ships subject to the enhanced survey programme such as bulk carriers, oil tankers and chemical tank-

ers, etc. is to complete the Owner Inspection Report and retain it inside the ship, according

103. of the Rules. An example of the Owner Inspection Report is shown in Table 1.

to requirement Ch 3,


Elements

Cracks

Buckling

Corrosion

Coating Cond.

Pitting

Rep., Mod

Other

Deck

Bottom

Side

Longi. BHD

Trans BHD

Table 1 Example of Owner Inspection Report


Owners Inspection Report(Structural Condition)


image Ship's Name : image Tank No./Hold No. :


image Grade of Steel :


· Deck : Side :


· Bottom : Longi. BHD :


· Trans. BHD :


image Repairs carried out due to :


image Thickness measurements carried out :

· Date :

· Result in General :


image Overdue Survey :


image Outstanding Conditions of Class : image Comments :


Date of Inspection : Inspected by : Signature :


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Guidance Relating to the Rules for the Classification of Steel Ships 2015 121

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Annex 1-5 Thickness Measurement Method for Hull Structural Members


1. General

(1) Purpose of thickness measurement

(A) Corrosion seems to be one of the common denominators in many cases of serious hull cas- ualties resulting in losses of vessels, cargoes and human lives. The purpose of thickness measurement described in the Rules is to prevent vessels from hull casualties. Information provided in the report of hull thickness measurements for a vessel put in service indicates that the vessel is maintaining sufficient local and global strength, if necessary renewal/repair works can be made accordingly. Therefore, thickness measurement reports giving information for the assessment of hull strength(including watertight integrity) as well as for the main- tenance of the hull is to be carefully considered.

(B) Where the ship has been constructed with FRP, aluminum alloy or other anti-corrosion ma- terials, the thickness measurements may be dispensed with.

(2) Extent of thickness measurement

The standard extent of thickness measurements complying with the "Rules for Classification of Steel Ships" is given in Table 4 to Table 13. However, the extent of thickness measurements may be specially considered by the Society, considering the coating and corrosion condition.

(3) Thickness measurement report

(A) The thickness measurement report submitted to the Society shall include the general partic- ulars as shown in Table 19, measuring position, diagram with details of the position to be

measured, original thickness, maximum allowable diminution and present thickness(gauged) and diminution, etc. Reporting form shown in Table 20(or equivalent form) is to be used

for recording measuring position, original thickness, maximum allowable diminution, present

thickness(gauged) and diminution, etc.

(B) The thickness measurement report is to be verified and countersigned by the attending Surveyor, and the record is to be kept in the Society and on board the ship.


2. Wear Limit

(1) General

(A) This annex provides standard of wear limit for decision of repair of main hull structural members. Wear limit or allowable wear quantity means allowable wear limit.

(B) When worn down thickness of hull structural members exceed the wear limit, inspections

are to be carried out in detail and corresponding hull structural members are to be renewed by the date recommended by the Surveyor.

(C) Wear limit provided by this annex is based on the requirements and scantlings during

construction. Therefore, the wear limit for the structural members which have scantlings larger than the required ones and margin in strength may be considered appropriately.

(D) Wear limit on hull structural members not provided by this annex follows what is deemed appropriate by the Surveyor.

(2) Wear limit on hull structural members

(A) Wear limits on structural members are provided in Table 1. However, for vessels built un-

der IACS Common Structural Rules(Pt 11, Pt 12 or Pt 13), Pt 1, Ch 3, 105. 2 of the Rules is to be applied.

(B) Value of wear limit indicates the limit on equally distributed wearing.

(C) When partial corrosion occurs in stress concentrated part, partial replacement or reinforce- ment shall be carried out without reference to Table 1.


122 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 1 Wear limit on members



Local Wear

Limit


Name of member

Wear limit

Class 1)

Class 1)

Class 1)


Strength deck plating, sheer strake and longitudinals to these members,

shell plating, bottom shell plating, bulkhead plating of deep tank4), topside sloping plating,

hopper side sloping plating, inner bottom plating


20 % of original thickness


(20 % of original thickness)

+ 1 mm


1 mm

Floor & girder of double bottom,

web and face of primary supporting member

20 % of original thickness

25 % of original thickness

Effective deck5) plating, superstructure deck plating,

deck plating inside the line of cargo hatch openings,

watertight bulkhead plating other than bulkhead plating of deep tank,

hatch cover(including stiffeners), hatch coaming(including stiffeners),

web, face and brackets of secondary stiffener3)


25 % of original thickness


30 % of original thickness


Web, face and brackets of frames in cargo hold/tank


20 % of original thickness

or 1.5 mm , whichever greater

25 % of original thickness

or 2.5 mm , whichever

greater


Partial corrosion (e.g pitting)

30 % of original thickness

35 % of original thickness


(NOTES)

1) For ships classed through the Classification Survey during Construction : the Class I, II and III are as follow.

(a) Class I : It is applied to ships having one or two of the following characteristics.

(i) Ships, with of length of 90 m and above, which are classed with Classification Survey

during Construction in accordance with the Rules after 1st July 1998.

(ii) Ships carry for liquid cargo, which are classed with Classification Survey during

Construction in accordance with the Rules after 1st July 1998.

(b) Class II : Ships, other than in Class I and III.

(c) Class III : Ships constructed with steel, which is applied to the Rules for

the Classification of High Speed and Light Crafts and the Guidance Relating to the Rules for the Classification of High Speed and Light

Crafts.

2) For ships classed through the Classification Survey after Construction, the separate requirements specified by the Society are to be applied.

3) Secondary stiffener refers to the member which is supported by the primary supporting member

and does not support another reinforcement member.

4) Definition of deep tank is specified in Pt 3, Ch 15, 101. of the Rules.

5) Definition of effective deck is specified in Pt 3, Ch 5, 103. of the Rules.


Wear

relati ng to the Shearing Strength

The shearing strength evaluation is to be carried out in any of the following cases when the thickness measurement for the longitudinal strength evaluation is carried out in accordance with the separate re- quirements specified by the Society.

1) For oil tankers(including chemical tankers), the average corrosion of any stake in side shell or lon- gitudinal bulkhead exceeds the followings,

Class I : 2.0 mm

Class II : 3.0 mm

2) For liquefied gas carriers, the average corrosion of any stake in side shell bulkhead exceeds the

followings, or

Class I : 1.5 mm

Class II : 2.5 mm

3) For bulk carriers(including ore carriers) intended for alternate loading, the average corrosion of any

stake in side shell or longitudinal bulkhead exceeds the followings Class I : 1.5 mm

Class II : 2.5 mm


Guidance Relating to the Rules for the Classification of Steel Ships 2015 123

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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(3) Wear limit of hold hatch cover of bulk carriers which are contracted for construction after 1st July 1998 and before 1st January 2004 and designed by the Rules Pt 7, Ch 3, Sec 9 is to be determined in accordance with the following requirements.

(A) Single skin hatch covers and the pontoon hatch covers

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(a) Steel renewal is required where the gauged thickness is worn more than 1.5 mm (less than mm ). The net image is the thickness obtained by subtracting the corrosion addition from the required thickness.

(b) Where the gauged thickness is worn within the range 1.0 mm and 1.5 mm

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( mm and mm ), coating applied in accordance with coating

manufactur- er's requirements or annual gauging may be adopted as an alterative to steel renewal.

(B) Internal structural members of pontoon hatch covers

previous (a) or when it is deemed necessary, at the discretion of the Society, on the basis

of the plating corrosion or deformation condition. In these cases,

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ternal structures is required where the gauged thickness is worn than

steel renewal for the in-

more than 1.5 mm (less

(4) Wear limit of hold hatch cover and hatch coatings of all bulk carriers, ore carriers and combi-

nation carriers by the Rules requirements.

which are contracted for construction on or after 1st January 2004 and designed

Pt 7, Ch 3, Sec 9 is to be determined in accordance with the following

(A) Single skin hatch covers and double skin hatch covers

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(a) Steel renewal is required where the gauged thickness is worn more than 1.5 mm (less than mm ).

(b) Where the gauged thickness is worn within the range 1.0 mm and 1.5 mm

image

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( mm and mm ), coating applied in accordance with coating

manufactur- er's requirements or annual gauging may be adopted as an alterative to steel renewal. Coating is to be maintained in GOOD condition, as defined in Pt 1, Ch 2, 101. 16 of the Rules

(B) Internal structural members of double skin hatch covers

Thickness gauging is required when plating renewal is to be carried out in accordance with

previous (a) or when it is deemed necessary, at the discretion of the Society, on the basis

of the plating corrosion or deformation condition. In these cases,

ternal structures is required where the gauged thickness is worn than image

(C) Hatch coamings

steel renewal for the in- more than 1.5 mm (less

(a) Steel renewal is required where the gauged thickness is worn more than 1.0 mm (less

than image

(b) Where the gauged thickness is worn within the range 0.5 mm and 1.0 mm

image

image

( mm and mm ), coating applied in accordance with coating

er's requirements or annual gauging may be adopted as an alterative to steel renewal.

Coating is to be maintained in GOOD condition, as defined in Pt 1, Ch 2, 101. 16 of

the Rules

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(5) The renewal thickness( ) of steel hatch covers and coamings in position I and II on

ex- posed decks, subjected to Pt 4, Ch 2, of ships other than bulk carriers which are keel laid on or after 1st January 2005 are to be in accordance with as followings. (Refer to Pt 4, Ch 2,


image

(mm)


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Where,


: as built thickness


image : corrosion addition according to Pt 4, Ch 2, 105. Table 4.2.1 of the Rules

Where the corrosion addition image is 1.0 mm , the renewal thickness may be given by the following formula


image

(mm)


124 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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(6) Wear limit of corrugated transverse watertight bulkheads for bulk carriers, which are contracted for construction after 1st July 1998 and designed by the Rules Pt 7, Ch 3, 1201. is to be de- termined in accordance with the following requirements.

(A) Steel renewal is required where the gauged thickness is worn more than 3.0 mm (less than

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mm ).

(B) Where the gauged thickness is worn within the range 2.5 mm and 3.0 mm (image

mm

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and mm ), coating applied in accordance with coating manufacturer's requirements or

annual gauging may be adopted as an alterative to steel renewal.

(7) Corrosion addition and steel renewal of vertically corrugated transverse watertight bulkheads be-

tween cargo holds No. 1 and 2 for bulk carriers, which are applied to Pt 7, Annex 7-5, 1 (1)

(8) The wastage allowances of supporting hull structures associated with ject to Pt 4, Ch 10 of the Rules, of ships which are keel laid on

towing and mooring, sub- or after 1st January 2007

are not to exceed the corrosion addition as specified in Pt 4, Ch 10, 201. 6 and 202.

the Rules.

6 of


3. Methods of Thickness Measurement

An essential part of most surveys is the determination of the residual thickness of the structure in critical areas. Ultrasonic thickness gauging by pulse echo method is used almost exclusively for this purpose. However, measuring by drilled holes may also be acceptable. As a method of thick- ness measurement, where ultrasonic thickness gauging methods are used, attention is to be paid to the following:

(1) Surface condition

Surfaces upon which the probe makes contact are to be sufficiently free from scale, loose paint, corroded surfaces or other foreign matters to the extent that their presence does not result in in- accurate readings when acoustic couplants such as glycerine or glycerine-water solutions are

used during inspection. In special cases, readings through paint film by a special instrument may be accepted.

(2) Couplants

It is essential that good acoustic contact is achieved between the probe and the surface of the plate being measured. Therefore, acoustic couplants(e.g., coupling fluid; 75 % glycerine-water sol- utions or glycerine) between the probe and surface of material are usually used for better

achievements. Where the direction of contact surfaces is vertical or overhead, a paste or liquid with suitable viscosity may be used to prevent acoustic couplants from dropping.

(3) Calibrations

An instrument is to be calibrated with a reference calibration standard each time it is used, and it is to be recalibrated whenever equipment calibration is suspected of being in error.


4. Location of Thickness Measurement

(1) Thickness measurements for suspect area

At each Special Survey, the thickness gaugings may be required as in suspect areas(i.e., locations showing substantial corrosion and/or

to be prone to rapid wastage). Details are given in Table 2.

(2) Location and number of thickness measuring points

The standard location and number of thickness measuring points


a result of Close-up Survey considered by the Surveyor


and patterns are shown in

Table 3. These figures show typical arrangements of ships such as bulk carriers and oil tank-

ers, etc. and these may be used as guidance for different type of ships other than those illustrated. The location and number of thickness measuring points for other hull structural mem- bers which are not specified in this Annex are to be in accordance with what considered appro-

priate by the Surveyor taking into account of the ship's age and hull structure, etc.

(3) Thickness Measurement at Special Survey

The standard extent of thickness measurements at each Special Survey are given in Table 4 to

Table 13.


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Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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5. Additional Thickness Measurement

The extent of additional thickness measurement at those areas of substantial corrosion of ships sub- ject to the enhanced survey programme such as bulk carriers, oil tankers and chemical tankers, etc. is shown in Table 14 to Table 18.


6. Sampling method of thickness measurements for longitudinal strength evaluation and re- pair methods for oil tankers or double hull oil tankers subject to the enhanced survey programme

(1) Extent of longitudinal strength evaluation

Longitudinal strength should be evaluated within 0.4 imageamidships for the extent of the hull gird- er length that contains tanks therein and within 0.5 imageamidships for adjacent tanks which may

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(2) Sampling method of thickness measurement

(A) Pursuant to the requirements of Ch 3, 304. 4 or 504. 4 of the Rules as applicable, trans-

verse sections should be chosen such that thickness measurements can be taken for as many different tanks in corrosive environments as possible, e.g. ballast tanks sharing a com- mon plane boundary with cargo tanks fitted with heating coils, other ballast tanks, cargo

tanks permitted to be filled with sea water and other cargo tanks. Ballast tanks sharing a common plane boundary with cargo tanks fitted with heating coils and cargo tanks permit- ted to be filled with sea water should be selected where present.

(B)


(C)


(D)


(E)


(F)

The minimum number of transverse sections to be sampled should be in accordance with

Ch 3, Table 1.3.5 or Table 1.3.11 of the Rules as applicable. The transverse sections

should be located where the largest thickness reductions are suspected to occur or are re- vealed from deck and bottom plating measurements prescribed in (C) and should be clear

of areas which have been locally renewed or reinforced.

At least two points should be measured on each deck plate and/or bottom shell plate re- quired to be measured within the cargo area in accordance with the requirements of Ch 3,

Table 1.3.5 or Table 1.3.11 of the Rules as applicable.

Within 0.1 image(where imageis the ship's moulded depth) of the deck and bottom at each trans- verse section to be measured in accordance with the requirements of Ch 3, Table

1.3.5 or

Table 1.3.11 of the Rules as applicable, every longitudinal and girder should be measured on the web and face plate, and every plate should be measured at one point between

longitudinals.

For longitudinal members other than those specified in (D) above to be measured at each transverse section in accordance with the requirements of Ch 3, Table 1.3.5 or Table

1.3.11 of the Rules as applicable, every longitudinal and girder should be measured on the

web and face plate, and every plate should be measured at least in one point per strake. The thickness of each compartment should be determined by averaging all of the measure-

(3) Additional measurements where the longitudinal strength is deficient.

(A) Where one or more of the transverse sections are found to be deficient in respect of the

longitudinal strength requirements, the number of transverse sections for thickness measure- ment should be increased such that each tank within the 0.5 imageamidships region has been sampled. Tank spaces that are partially within, but extend beyond, 0.5 image region,

should be sampled.

(B)

Additional thickness measurements should also be performed on one transverse section for-

ward and one aft of bordering the repaired

each repaired area to the extent necessary to ensure that the areas section also comply with the requirements of the Rules.


126 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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(4) Effective repair methods

(A) The extent of renewal or reinforcement carried out to comply with the Rules should be in accordance with (B) below.

(B)

The minimum continuous length of a renewed or reinforced structural member should be not less than twice the spacing of the primary members in way. In addition, the thickness

diminution in way of the butt joint of each joining member forward and aft of the re-

placed member(plates, stiffeners, girder webs and flanges, etc.) should not be within the


(C)

substantial corrosion range(75% of the allowable webs and flanges,

within the substantial corrosion range(75% of the allowable diminution particular member). Where differences in thickness at the butt joint lower thickness, a transition taper should be provided.

Alternative repair methods involving the fitting of straps or structural

etc.) should not be

associated with each exceed 15% of the


member modification

should be subject to special consideration. In considering the fitting of straps, it should be limited to the following conditions:

(a) to restore and/or increase longitudinal strength;

(b) the thickness diminution of the deck or bottom plating to be reinforced should not be within the substantial corrosion range(75% of the allowable diminution associated with the deck plating):

(c)


(d)

(e)

the alignment and arrangement, including the termination of the straps, is in accordance with the separate requirements specified by the Society;

the straps are continuous over the entire 0.5 imageamidships length; and

continuous fillet welding and full penetration welds are used at butt welding and, de- pending on the width of the strap, slot welds. The welding procedures applied should be

acceptable to the Society.

(D) The existing structure adjacent to replacement areas and in conjunction with the fitted

straps, etc. should buckling resistance

envelope plating.

be capable of withstanding the applied loads, taking into account the

and the condition of welds between the longitudinal members and hull


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Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 2 Suspect areas on which attention is to be paid


Location

Measuring Points


Deck and upper

structures

Special attention is to be given on fore parts (forward of 0.5 imageamidships) of strength deck, areas with standing bilges and members with originally light scantlings in addition to the following:


F'cle, poop and deckhouse

Break bulkheads of superstructures, Lower parts of deckhouse walls, Pipe penetration areas, Areas with drain plugs, Deck platings of superstructures, Deck platings in way of bilge- ways, deck scuppers, deck machinery(winches, windlasses etc.), fair-leaders and bollards etc.


Deck platings inside line of hatch openings and inside superstructures and deckhouses

Deck platings inside line of openings between cargo hatch- ways, and of deck platings inside superstructures and deckhouses.


Hatch coamings and coaming stays

Lower parts attached to upper deck, Parts around steam pipes.


Bulwark platings and bulwark stays

Lower parts attached to upper deck,

End parts connected to superstructures and deckhouses, Platings around freeing ports.

Winch foundation

Special attention is to be given to steam winch foundations

Steel hatch covers

Steel pontoon covers (including cleats, etc.)


Shells


Wind and water strakes

Special attention is to be given to fore and after part outside of 0.5 imageamidships.


Shell platings connected to end brackets

After removal of limber boards and cement chocks, Close-up Survey is required.

Shells attached to hold frames

Special attention is to be given to groovings on shells.

Shells around chain lockers

-


Hard spotted shells

Special attention is to be given to shells (parts or positions) in ballast tanks


Internal members

Special attention is to be given to areas with high humidity, standing bilges and poorly ventilated spaces in addition to the following :

Joint parts between hold frames and frame brackets

After removal of limber board, those parts are to be exam- ined (problem areas in aged ships)

Intersections between transverse W/T Bulkhead and inner bottom

After removal of bottom ceilings, those parts are to be examined.

Tank top platings of double bottom tanks and of deep tanks used as ballast tanks


-

Fillet weld parts between hold frames and side shells

Special attention is to be paid to hold frames in intermittent welds.


Bilge wells

Special attention si to be given to bilge wells in E/R and bilge wells with piping arrangements.

Inner bottom platings under pillars

-

Internal members around sea water pumps in E/R


-

Sea chest boundaries in E/R

-

Joint parts between shaft tunnel and inner bottom


Close-up Survey is required for aged ships

Intersections between tweendeck frames or tweendeck bulkheads and lower deck


-

Lower parts of collision BHD and bottom of chain lockers


-

Intersections between panting/side stringers and frames, and end parts, slot areas in way of panting/side stringers


-


128 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 2 Suspect areas on which attention is to be paid (continued)



Location


Measuring Points


Inside of tanks


Special attention is to be paid to the combined tanks (ballast and fuel oil), prone to rapid wastage, in addition to the following:


All of ballast tanks in front of E/R boundaries


Close-up Survey is required for tank top, bottom and boundary plat- ings of the tanks not forming their boundaries by full envelope (both shells and decks). And special attention is to be paid to connections between frames and brackets, and on docking brackets, lightening holes


Double bottom ballast tanks, side ballast tanks, and shaft tunnels


Special attention is to be paid to inner bottom platings meeting bulk- heads, edge platings reaching to tank side brackets, and on lightening holes/slots in way of girders and on bottom shells around striking pads below sounding pipes.


Bulkheads facing a heated zone


Special attention is to be paid to bulkheads facing E/R space, or fuel oil tanks being heated.


Bottom platings below sound- ing pipes


Special attention is to be paid to bilge tanks in E/R


Chain lockers in fore peak tanks


Special attention is to be paid to bottom platings and side boundaries of chain lockers.


Guidance Relating to the Rules for the Classification of Steel Ships 2015 129

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships

Table 3-1 is to be applied to vessels not built under IACS Common Structural Rules(Pt 11, Pt

(i.e. Non-CSR Ships)


12 or Pt 13)


Items

Location and number of thickness measuring points


Transverse Section

1. For oil tankers, chemical tankers or double hull oil tankers subject to the enhanced survey programme (See Fig 1 and Fig 2)

(1) At each transverse section, every plate within 0.1D(where D is the ship's mould- ed depth) of the deck and bottom is to be measured at one point between lon- gitudinals, and all the other plate is to be measured at least one point per strake.

(2) Where the thickness measurements for a transverse section are to include all longitudinal members, every longitudinal is to be measured at one point on the web and face plate.

2. For single skin bulk carriers, double skin bulk carriers or general dry cargo ships (See Fig 3 and Fig 4)

(1) At each transverse section, every plate of the deck and inner bottom is to be measured at one point between longitudinals, and all the other plate is to be measured at least one point per strake.

(2) Where the thickness measurements for a transverse section are to include all longitudinal members, every longitudinal is to be measured at one point on the web and face plate.

3. For general ships other than 1 and 2 above (See Fig 5)

(1) At each transverse section, every plate is to be measured at least two points per strake.

(2) Where the thickness measurements for a transverse section are to include all longitudinal members, every longitudinal is to be measured at one point on the web and face plate.

4. For transversely framed vessels, a transverse section includes adjacent frames and their end connections in way of transverse sections.

(For oil tankers, chemical tankers or double hull oil tankers subject to the en- hanced survey programme see Fig 1 and Fig 2, for single skin or double skin bulk carriers see Fig 6 and Fig 8, for other ships see Fig 7)

Transverse Section of deck, side shell and bottom plating

At least two points on each plate(either at each 1/4 extremity of plate or at repre- sentative areas of average corrosion) are to be measured in the transverse section concerned.

Selected plates:

Selected plates on deck(including deck inside line of hatch openings), tank top, bottom, inner bottom plates, etc. and wind-and-water strakes

At least two points are to be measured at representative areas of average corrosion. Where the length of the plate exceeds 6 m , two points per 6 m are to be gauged additionally. Where plates cross ballast/cargo tank boundaries separate measurements for the area of plating in way of each type of tank are to be taken. In case of side shell plating, one or two wind and water strakes are to be gauged according to No. of Special Survey. The gauging location of each plate may be selected by the attending Surveyor in consideration of the corrosion pattern.

All plates:

All deck(including deck inside line of hatch openings), tank top, bottom, inner bottom plates, etc. and

wind-and-water strakes


At least two points on each plate(either at each 1/4 extremity of plate or at repre- sentative areas of average corrosion) are to be measured. Where the length of the plate exceeds 6 m , two points per 6 m are to be gauged additionally. Where plates cross ballast/cargo tank boundaries separate measurements for the area of plating in way of each type of tank are to be taken.


Selected internal structures: Selected internal structure such as floors and longitudinals, transverse frames, web frames, deck beams, girders

The internal structural members to be measured in each space internally surveyed are to be

1. at least 10% outside the cargo (length) area,

2. at least 20% within the cargo (length) area.

(For oil tankers, chemical tankers or double hull oil tankers subject to the enhanced survey programme see Fig 1 and Fig 2, for single skin or double skin bulk carriers see Fig 6, for other ships see Fig 7)


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


Items

Location and number of thickness measuring points

Selected side shell frames in cargo holds for single skin bulk carriers or general dry cargo ships


1. 25% of frames: one out of four frames is to be chosen preferably throughout the car- go hold length on each side.

2. "Selected frames" means at least 3 frames on each side of cargo holds.

(For single skin bulk carriers see Fig 6, for general dry cargo ships see Fig 7)

Transverse webs in ballast tanks for single skin bulk carriers, double skin bulk carriers or general dry cargo ships


One of the representative tanks of each type (i.e. topside or hopper or side tank) is to be chosen in the forward part.

(For single skin or double skin bulk carriers see Fig 6, for general dry cargo ships see

Fig 7)

Transverse frames in double skin tanks for double skin bulk carriers


25% of transverse frames: one out of four transverse frames is to be chosen preferably throughout the double skin tank length. (See Fig 8)


Transverse bulkheads

1. For oil tankers, chemical tankers or double hull oil tankers subject to the enhanced survey programme: See Fig 1 and Fig 2

2. For single skin bulk carriers, double skin bulk carriers or general dry cargo ships (See Fig 9 to Fig 11)

(1) Transverse bulkheads in cargo holds

- Includes bulkheads plating, stiffeners and girders, including internal structure of upper and lower stools, where fitted.

- Two selected bulkheads : one is to be the bulkhead between the

two foremost cargo holds and the second may be chosen in other positions

(2) One transverse bulkhead in each cargo hold

- The Close-up Survey and related thickness measurements are to be carried out on one side of the bulkhead; the side is to be chosen based on the outcome of the Overall Survey of both sides. In the event of doubt, the Surveyor may also require (possibly partial) Close-up Survey and related thick- ness measurements on the other side.

(3) Transverse bulkheads in one ballast tank

- The ballast tank is to be chosen based on the history of ballasting among those prone to have the most severe conditions.

Cargo hold hatch covers and coamings


See Fig 12

(NOTES)

1. image mark : means the location to be measured.

2. X mark : means the point to be measured.


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


Fig 1 Locations of measurements of oil tankers and chemical tankers


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


Fig 2 Locations of measurements of double hull oil tankers


Fig 3 Locations of measurements on transverse section of single skin or double skin bulk carriers


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


Fig 4 Locations of measurements on transverse section of general dry cargo ships


(Notes) It may also apply to other type of transverse section.

Fig 5 Locations of measurements on transverse section of general ships


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


(Notes) The gauging pattern for web plating is to be a three point pattern for zones A, C and D, and a two point

pattern for zone B. The gauging report is to reflect the average reading. The average reading

is

to

be

compared with the allowable thickness. If the web plating has general corrosion the this pattern

is

to

be

expanded to a five point pattern.


Fig 6 Locations of measurements on structural members in cargo holds and ballast tanks of single skin or double skin bulk carriers


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


(Notes) It may also apply to other ship types.


Fig 7 Locations of measurements on selected internal structural members


Fig 8 Locations of measurements on transverse frame in double skin tank of double skin bulk carriers


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


Fig 9 Locations of measurements on cargo hold transverse bulkheads of single skin or double skin bulk carriers


(Notes)

1. Cargo hold bulkhead/watertight floor plating to be measured as per main view.

2. One stiffener out of three to be measured as per view A-A.

3. It may also apply to other ship types.

Fig 10 Locations of measurements on transverse bulkheads of general dry cargo ships


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


(Notes) Measurements to be taken in each vertical section as per view A-A.


Fig 11 Locations of measurements on transverse bulkheads in topside, hopper, double hull and double bottom ballast tanks of single skin or double skin bulk carriers


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Table 3-1 Location and number of thickness measuring points - Non-CSR Ships (continued)


(Notes)

For each hatch covers, three sections at L/4, L/2 and 3L/4 of hatch cover length, including:

- one measurement of each hatch cover plate and skirt plate

- measurements of adjacent beams or girder(including stiffeners)

- one measurement of coaming plates and coaming flange, each side

For each hatch covers, one measurement of hatch cover skirt plate, coaming plate and coaming flange on both ends

One measurement of one out of three hatch coaming brackets and bars, on both sides and both ends

One measurement of each hatch coaming end bracket


Fig 12 Locations of measurements on hatch covers and coamings


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Table 3-2 Location and number of thickness measuring points - CSR Ships

Table 3-2 is to be applied to vessels built under IACS Common Structural Rules(Pt 11, Pt 12 or Pt 13)

(i.e. CSR Ships).

1) CSR bulk carriers


Items

location and number of thickness measuring points

Figure reference

Selected plates on deck, tank top, bottom, double bottom and wind-and-water area

"Selected" means at least a single point on one out of three plates, to be chosen on representative areas of average corro- sion

All deck, tank top and bot- tom plates and

wind-and-water strakes

At least two points on each plate to be taken either at each 1/4 extremity of plate or at representative areas of average corrosion

Transverse section

- For single skin bulk carriers :

A transverse section includes all longitudinal members such as plating, longitudinals and girders at the deck, side, bottom, inner bottom and hopper side plating, longitudinal bulkhead and bottom plating in top wing tanks.


- For double skin bulk carriers :

A transverse section includes all longitudinal members such as plating, longitudinals and girders at the deck, side, bottom, inner bottom and hopper sides, inner sides and top wing inner sides.

Fig 1

All cargo hold hatch cov- ers and coamings

Including plates and stiffeners

Locations of points are given in Fig 2

Transverse section of deck plating outside line of car- go hatch openings

Two single points on each deck plate (to be taken either at each 1/4 extremity of plate or at representative areas of aver- age corrosion) between the ship sides and hatch coamings in the transverse section concerned

All deck plating and under deck structure inside line of hatch openings between cargo hold hatches

"All deck plating" means at least two points on each plate to be taken either at each 1/4 extremity of plate or at repre- sentative areas of average corrosion.


"Underdeck structure": at each short longitudinal girder: three points for web plating(fwd/middle/aft), single point for face plate, one point for web plating and one point for face plat- ing of transverse beam in way. At each ends of transverse beams, one point for web plating and one point for face plat- ing

Extent of areas is shown in Annex

1-6, 1 (2) or (6) of

the Guidance


Location of points are given in Fig 6


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


Items

location and number of thickness measuring points

Figure reference

Single skin bulk carriers: Selected side shell frames in cargo holds for single skin bulk carriers

Includes side shell frame, upper and lower end attachments and adjacent shell plating.


25% of frames: one out of four frames should preferably be chosen throughout the cargo hold length on each side.


50% of frames: one out of two frames should preferably be chosen throughout the cargo hold length on each side.


"Selected frames" means at least 3 frames on each side of cargo holds

Extent of areas is shown in Annex

1-6, 1 (2) or (6) of

the Guidance


Locations of points are given in Fig 3

Double skin bulk carriers: Transverse frame in dou- ble skin tank


Fig 1

Transverse bulkheads in cargo holds

Includes bulkhead plating, stiffeners and girders, including in- ternal structure of upper and lower stools, where fitted.


Two selected bulkheads: one is to be the bulkhead between the two foremost cargo holds and the second may be chosen in other positions

Areas of measure- ments are shown in Annex 1-6, 1 (2) or (6) of the Guidance


Locations of points are given in Fig 4

One transverse bulkhead in each cargo hold

This means that the Close-up Survey and related thickness measurements are to be performed on one side of the bulk- head; the side is to be chosen based on the outcome of the overall survey of both sides. In the event of doubt, the Surveyor may also require (possibly partial) Close-up Survey and related thickness measurements on the other side

Areas of measure- ments are shown in Annex 1-6, 1 (2) or (6) of the Guidance


Locations of points are given in Fig 4

Transverse bulkheads in one topside, hopper and double bottom ballast tank

Includes bulkhead and stiffening systems.


The ballast tank is to be chosen based on the history of bal- lasting among those prone to have the most severe conditions

Locations of points are given in Fig 5

Transverse webs in ballast tanks

Includes web plating, face plates, stiffeners and associated plating and longitudinals.


One of the representative tanks of each type (i.e. topside or hopper or side tank) is to be chosen in the forward part

Areas of measure- ments are shown in Annex 1-6, 1 (2) or (6) of the Guidance


Locations of points are given in Fig 3

(NOTES)

1. image mark : means the location to be measured.

2. × mark : means the point to be measured.


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


Single skin bulk carriers


Double skin bulk carriers


(Notes) Measurements are to be taken on both port and starboard sides of the selected transverse section.


Fig 1 Locations of measurements on transverse section of single skin or double skin bulk carriers


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


(Notes)

1. Three sections at L/4, L/2, 3L/4 of hatch cover length, including: one measurement of each hatch cover plate and skirt plate measurements of adjacent beams and stiffeners

one measurement of coaming plates and coaming flange, each side

2. Measurements of both ends of hatch cover skirt plate, coaming plate and coaming flange

3. One measurement(two points for web plate and one point for face plate) of one out of three hatch coam- ing brackets and bars, on both sides and both ends


Fig 2 Locations of measurements on hatch covers and coamings


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


(Notes) The gauging pattern for web plating is to be a three point pattern for zones A, C and D, and a two point pattern for zone B (see figure). The gauging report is to reflect the average reading. The average reading is to be compared with the allowable thickness. If the web plating has general corrosion then this pattern is to be expanded to a five point pattern.


Single skin bulk carriers


Double skin bulk carriers


Fig 3 Locations of measurements on structural members in cargo holds and ballast tanks of single skin bulk carriers and in ballast tanks(topside or hopper or side tank) of double skin bulk carriers


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


(Notes) Measurements to be taken in each shaded area as per views A-A and B-B.

Additional measurements to internal structure of upper and lower stools to be added, e.g. two points in the upper and two points in the lower stools to be indicated in section A-A.


Fig 4 Location of measurements on cargo hold transverse bulkheads of single skin or double skin bulk carriers


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


(Notes) Measurements to be taken in each vertical section as per view A-A

Two additional measurements to internal structure of double bottom tank to be added at midspan.


Fig 5 Locations of measurements on transverse bulkheads of topside, hopper, double hull and double bottom ballast tanks of single skin or double skin bulk carriers


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


Fig 6 Locations of measurements on underdeck structure


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


2) CSR double hull oil tankers


Items

location and number of thickness measuring points

Figure reference

Selected plates

"Selected" means at least a single point on one out of three plates, to be chosen on representative areas of average corro- sion

Deck, bottom plates and wind-and-water strakes

At least two points on each plate to be taken either at each 1/4 extremity of plate or at representative areas of average corrosion

Transverse section

Measurements to be taken on all longitudinal members such as plating, longitudinals and girders at the deck, side, bottom, longitudinal bulkheads, inner bottom and hopper. One point to be taken on each plate. Both web and flange to be measured on longitudinals, if applicable.


For tankers older than 10 years of age:


within 0.1D (where D is the ship’s moulded depth) of the deck and bottom at each transverse section to be measured, every longitudinal and girder is to be measured on the web and face plate, and every plate is to be measured at one point between longitudinals.


Fig 1

Transverse rings3) in cargo and ballast tanks

At least two points on each plate in a staggered pattern and two points on the corresponding flange where applicable. Minimum 4 points on the first plate below deck. Additional points in way of curved parts. At least one point on each of two stiffeners between stringers / longitudinal girders.

Fig 2


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


Items

location and number of thickness measuring points

Figure reference

Transverse bulkheads in cargo tanks

At least two points on each plate. Minimum 4 points on the first plate below main deck.


At least one point on every third stiffener to be taken be- tween each stringer.


At least two points on each plate of stringers and girders, and two points on the corresponding flange. Additional points in way of curved part.


Two points of each diaphragm plate of stools if fitted.

Fig 3

Transverse bulkheads in ballast tanks

At least 4 points on plates between stringers / longitudinal girders, or per plate if stringers / girders not fitted.


At least two points on each plate of stringers and girders, and two points on the corresponding flange. Additional points in way of curved part.


At least one point on two stiffeners between each stringer / longitudinal girder.

Fig 4

Adjacent structural mem- bers

On adjacent structural members one point per plate and one point on every third stiffener / longitudinal.

(NOTES)

1. mark : means the location to be measured.

2. × mark : means the point to be measured.

3. Transverse rings means all transverse material appearing in a cross-section of the ship's hull, in way of a dou- ble bottom floor, vertical web and deck transverse (definition from IACS Common Structural Rules for Double Hull Oil Tankers(Pt 12 or Pt 13 of the Rules).


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


Fig 1 Locations of measurements on transverse section of double hull oil tankers


Fig 2 Locations of measurements on transverse rings in cargo and ballast tanks of double hull oil tankers


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Table 3-2 Location and number of thickness measuring points - CSR Ships (continued)


Fig 3 Locations of measurements on transverse bulkheads in cargo tanks of double hull oil tankers


Fig 4 Locations of measurements on transverse bulkheads in ballast tanks of double hull oil tankers


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Table 4 Extent of thickness measurements at Special Survey - General Ships



No. of Special Survey


Extent and location of measurement


Special Survey No. 1


(1) Suspect areas throughout the vessel


Special Survey No. 2


image


(1) Suspect areas throughout the vessel

(2) One transverse section of deck plating in way of a cargo space within the amidships 0.5 image


Special Survey No. 3


image


(1) Suspect areas throughout the vessel

(2) Two transverse sections within the amidships 0.5 imagein way of two different cargo spaces4), 5), 6), 7)

(3) All cargo hold hatch covers and coamings(plating and stiffeners)

(4) Internals in forepeak and afterpeak tanks

(5) All transverse bulkheads in all cargo tanks8)

(6) All transverse bulkheads in all ballast tanks8)


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Table 4 Extent of thickness measurements at Special Survey - General Ships (continued)


No. of Special Survey


Extent and location of measurement


Special Survey No. 4

and Subsequent


image

(1) Suspect areas throughout the vessel

(2) A minimum of three transverse sections in way of cargo spaces within the amidships 0.5 5), 6), 7)

(3) All cargo hold hatch covers and coamings(plating and stiffeners)

(4) Internals in forepeak and afterpeak tanks

(5) All exposed main deck plating full length

(6) Representative exposed superstructure deck plating(poop, bridge and forecastle deck)

(7) Lowest strake and strakes in way of 'tween decks of all transverse bulkheads in cargo spaces together with internals in way

(8) All wind and water strakes, port and starboard, full length

(9) All keel plates full length. Also, additional bottom plates in way of cofferdams, machi- nery space and aft end of tanks

(10) Plating of seachests. Shell plating in way of overboard discharges as considered nec- essary by the attending Surveyor

(11) All transverse bulkheads and one web frame ring in all cargo tanks8)

(12) All transverse bulkheads and all web frame ring in all ballast tanks8)


(NOTES)

Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)

Thickness gaugings for the transverse section(including longitudinal members, for trans- versely framed vessels including adjacent frames and their end connections in way of transverse sections)

1) In application to this table, General Ships means ships except Other Ships in Table 1.2.4, 2. of the Rules.

2) Thickness measurement locations are to be selected to provide the best representative sampling of areas likely to be most exposed to corrosion, considering cargo and ballast history and arrangement and con- dition of protective coatings.

3) Thickness measurements of internals may be specially considered by the Surveyor if the hard protective coating is in GOOD condition.

4) For ships more than 100 meters in length, at Special Survey No. 3, thickness measurements of exposed deck plating within amidship 0.5 may be required.

5) For ships less than 100 meters in length, the number of transverse sections required at Special Survey No.

3 may be reduced to one (1), and the number of transverse sections required at Special Survey No. 4 and subsequent may be reduced to two (2).

6) For the pure car carrier, the extent of thickness measurement for transverse sections may by considered as follow: Exposed deck plates, side shell plates, bottom shell plates, inner bottom plates and longitudinal members in double bottom spaces.

7) Where the evaluation of longitudinal strength is required, all longitudinal structural members at the corre- sponding sections are to be gauged.

8) This requirement is to be applied only for tankers(including barges) for liquid cargo.


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Table 5 Extent of thickness measurements at Special Survey - Other Ships



No. of Special Survey


Extent and location of measurement


Special Survey No. 1


(1) Suspect areas throughout the vessel


Special Survey No. 2


image


(1) Suspect areas throughout the vessel

(2) One transverse section of deck plating5), side shell plating and bottom plating within the amidships 0.5 image


Special Survey No. 3


image

(1) Suspect areas throughout the vessel

(2) Two transverse sections of deck plating5), side shell plating and bottom plating within the amidships 0.5 image

(3) Internals in forepeak and afterpeak tanks


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Table 5 Extent of thickness measurements at Special Survey - Other Ships (continued)



No. of Special Survey


Extent and location of measurement


Special Survey No. 4

and Subsequent


image

(1) Suspect areas throughout the vessel

(2) Two transverse sections of side shell plating within the amidships 0.5 image

(3) Full length, all exposed main deck plating5)

(4) Full length, representative exposed superstructure deck plating(poop, bridge and forecastle deck)

(5) Full length, selected wind and water strakes

(6) Full length, bottom plating and flat keel plating

(7) Internals in forepeak and afterpeak tanks


(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)


1) In application to this table, Other Ships means the ship specified as follows except Special Purpose Ship

- Waste in Annex 1-1, 1.1 of the Guidance.

- the ship type 12, 13

- the ship less than 500 GT and not engaged on international voyages among ship type 15, 16, 17, 19, 20 and 26 to 30.

2) Thickness measurement locations are to be selected to provide the best representative sampling of area likely to be most exposed to corrosion.

3) Thickness measurements of internals may be specially considered by the Surveyor if the hard protective coating is in GOOD condition.

4) When the evaluation of longitudinal strength is required, all longitudinal structural members at the corre- sponding sections are to be gauged.

5) For fishing vessel, thickness measurement requirements in way of deck(gutter water way part and hatch coaming part) may be modified at the discretion of the Surveyor if the structure remains effectively pro- tected against corrosion by a permanent type special coating.


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Table 6 Extent of thickness measurements at Special Survey - General Dry Cargo Ships



No. of Special Survey


Extent and location of measurement


Special Survey No. 1


(1) Suspect areas


Special Survey No. 2


image


(1) Suspect areas

(2) One transverse section of deck plating in way of a cargo length area within the amidships 0.5 image

(3) Measurement for general assessment and recording of corrosion pattern of those

structural members subject to Close-up Survey


Special Survey No. 3


image


(1) Suspect areas

(2) Two transverse sections within the amidships 0.5 imagein way of two different cargo space2)

(3) Measurement for general assessment and recording of corrosion pattern of those structural members subject to Close-up Survey

(4) Within the cargo length area, each deck plate outside line of cargo hatch openings

(5) All wind and water strakes within the cargo length area

(6) Selected wind and water strakes outside the cargo length area


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Table 6 Extent of thickness measurements at Special Survey - General Dry Cargo Ships (continued)



No. of Special Survey


Extent and location of measurement


Special Survey No. 4

and Subsequent


image

(1) Suspect areas

(2) Within the cargo length area, a minimum of three transverse sections within the amidships 0.5 2)

(3) Within the cargo length area, each deck plate outside line of cargo hatch openings

(4) Within the cargo length area, each bottom plate, including lower turn of bilge

(5) Within the cargo length area, duct keel or pipe tunnel plating and internals

(6) Measurement for general assessment and recording of corrosion pattern of those structural members subject to Close-up Survey

(7) All wind and water strakes full length


(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)

Thickness gaugings for the transverse section(including longitudinal members, for transversely framed vessels including adjacent frames and their end connections in way of transverse sections)


1) Thickness measurement locations are to be selected to provide the best representative sampling of area likely to be most exposed to corrosion, considering cargo and ballast history and arrangement and con- dition of protective coatings.

2) For ships less than 100 meters in length, the number of transverse sections required at Special Survey No. 3 may be reduced to one and the number of transverse sections at Special Survey No. 4 and sub- sequent surveys may be reduced to two.


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Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 7 Extent of thickness measurements at Special Survey - Liquefied Gas Carriers


No. of Special Survey


Extent and location of measurement


Special Survey No. 1


image


(1) Suspect areas

(2) One section of deck plating for the full beam of the ship within 0.5 imageamidships in way of a ballast tank, if any

(3) Measurement for general assessment and recording of corrosion pattern of those structural members subject to Close-up Survey


Special Survey No. 2


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, one transverse section within 0.5 imageamidships in way of a ballast tank, if any

(4) Selected wind and water strakes outside the cargo area

(5) Measurement for general assessment and recording of corrosion pattern of those structural members subject to Close-up Survey


158 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 7 Extent of thickness measurements at Special Survey - Liquefied Gas Carriers (continued)


No. of Special Survey


Extent and location of measurement


Special Survey No. 3


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, two transverse sections1)

(4) Within the cargo area, all wind and water strakes

(5) Selected wind and water strakes outside the cargo area

(6) Measurement for general assessment and recording of corrosion pattern of those structural members subject to Close-up Survey


Special Survey No. 4

and Subsequent


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, three transverse sections1)

(4) Within the cargo area, each bottom plate

(5) Within the cargo area, duct keel plating and internals

(6) All wind and water strakes, full length

(7) Measurement for general assessment and recording of corrosion pattern of those structural members subject to Close-up Survey


Guidance Relating to the Rules for the Classification of Steel Ships 2015 159

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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image

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Table 7 Extent of thickness measurements at Special Survey - Liquefied Gas Carriers (continued)


(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)


Thickness gaugings for the transverse section(including longitudinal members, for transversely framed vessels including adjacent frames and their end connections in way of transverse sec- tions)


1) At least one section is to include a ballast tank within 0.5 amidships, if any.

2) For ships having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of thickness measurements may be increased to include the tank top plating at the discretion of the Surveyor.

3) For areas in spaces where protective coatings are found to be in GOOD condition, the extent of thickness measurements may be specially considered by the Society.

4) The Surveyor may extend the thickness measurements as deemed necessary. Where substantial corrosion is found, the extent of thickness measurements is to be increased to the satisfaction of the Surveyor.


160 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 8 Extent of thickness measurements at Special Survey - Bulk Carriers with ESP notation


No. of

Special Survey Extent and location of measurement


Special Survey

image

No. 1 (1) Suspect areas


Special Survey No. 2


(1) Suspect areas

(2) Within the cargo length, two transverse sections of deck plating outside line of cargo hatch openings

(3) Wind and water strakes in way of transverse sections considered under (2) above

(4) Selected wind and water strakes outside the cargo length area

(5) Measurement for, general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(6) See Ch 3, 201. 1 (4) of the Rules, Pt 7, Ch 3, Sec 17 of the Rules and the separate re- quirements specified by the Society for additional thickness measurement guidelines applicable to the side shell frames and brackets on ships subject to compliance with IACS UR S31


Special Survey image

No. 3 (1) Suspect areas

(2) Within the cargo length, each deck plate outside line of cargo hatch openings

(3) Within the cargo length, two transverse sections, one in the amidship area, outside line of cargo hatch openings

(4) Within the cargo length, all wind and water strakes

(5) Selected wind and water strakes outside the cargo length area

(6) Measurement for, general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(7) See Ch 3, 201. 1 (3) of the Rules and Annex 1-5, Table 9 of the Guidance for additional thickness measurement guidelines applicable to the vertically corrugated transverse watertight bulkhead between cargo hold Nos. 1 and 2 on ships subject to compliance with IACS URs S19 and S23

(8) See Ch 3, 201. 1 (4) of the Rules, Pt 7, Ch 3, Sec 17 of the Rules and the separate re- quirements specified by the Society for additional thickness measurement guidelines applicable to the side shell frames and brackets on ships subject to compliance with IACS UR S31


Guidance Relating to the Rules for the Classification of Steel Ships 2015 161

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 8 Extent of thickness (continued)

measurements at Special Survey - Bulk Carriers with ESP notation



No. of Special Survey


Structural members to be measured


Special Survey No. 4

and Subsequent


image

(1) Suspect areas

(2) Within the cargo length, each deck plate outside line of cargo hatch openings

(3) Within the cargo length, three transverse sections, one in the amid ship area, outside line of cargo hatch openings

(4) Within the cargo length, each bottom plates

(5) All wind and water strakes, full length

(6) Measurement for, general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(7) See Ch 3, 201. 1 (3) of the Rules and Annex 1-5, Table 9 of the Guidance for addi- tional thickness measurement guidelines applicable to the vertically corrugated transverse wa- tertight bulkhead between cargo hold Nos. 1 and 2 on ships subject to compliance with IACS URs S19 and S23

(8) See Ch 3, 201. 1 (4) of the Rules, Pt 7, Ch 3, Sec 17 of the Rules and the separate re- quirements specified by the Society for additional thickness measurement guidelines appli- cable to the side shell frames and brackets on ships subject to compliance with IACS UR S31

(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)

Thickness gaugings for the transverse section(including longitudinal members, for transversely framed vessels including adjacent frames and their end connections in way of transverse sections)


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162 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 9 Additional thickness measurements head between holds Nos. 1 and 2

of the vertically corrugated transverse watertight bulk-


Location

Vertically corrugated transverse watertight bulkhead between holds Nos. 1 and 2


Gauging point


1. The gauging is to be carried out at the levels as described below. To adequately assess the scantlings of each individual vertical corrugation, each corrugation flange, webs, shedder plate and gusset plate within each of the levels given below are to be gauged.

(1) Level (A) : Ships without lower stool (See Fig 1)

(a) The mid-breadth of the corrugation flanges at approximately 200 mm above the line of shedder plates;

(b) The middle of gusset plates between corrugation flanges, where fitted;

(c) The middle of the shedder plates;

(d) The mid-breadth of the corrugation webs at approximately 200 mm above the line of shedder plates.

(2) Level (B) : Ships with lower stool (See Fig 2)

(a) The mid-breadth of the corrugation flanges at approximately 200 mm above the line of shedder plates;

(b) The middle of gusset plates between corrugation flanges, where fitted;

(c) The middle of the shedder plates;

(d) The mid-breadth of the corrugation webs at approximately 200 mm above the line of shedder plates.

(3) Level (C) : Ships with or without lower stool (See Fig 1 or Fig 2)

(a) The mid-breadth of the corrugation flanges and webs at about the mid-height of the corrugation.

2. Where the thickness changes within the horizontal levels, the thinner plate is to be gauged.


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Guidance Relating to the Rules for the Classification of Steel Ships 2015 163

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 10 Extent of thickness measurements at Special Survey - Oil Tankers with ESP notation



No. of Special Survey


Extent and location of measurement


Special Survey No. 1


image

(1) Suspect areas

(2) One transverse section of deck plates for the full beam of the ship within the cargo area (in way of a ballast tank, if any, or a cargo tank used primarily for water ballast)

(3) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey


Special Survey No. 2


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, one transverse section

(4) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(5) Selected wind and water strakes outside the cargo area


164 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 10 Extent of

(continued)

thickness measurements at Special Survey - Oil Tankers with ESP notation


No. of Special Survey


Extent and location of measurement


Special Survey No. 3


image


(1) Suspect area

(2) Within the cargo area, each deck plate

(3) Within the cargo area, two transverse sections1)

(4) Within the cargo area, all wind and water strakes

(5) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(6) Selected wind and water strakes outside the cargo area


Special Survey No. 4

and Subsequent


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, three transverse sections1)

(4) Within the cargo area, each bottom plate

(5) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(6) All wind and water strakes, full length

(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)

Thickness gaugings for the transverse section(including longitudinal members, for transversely framed vessels including adjacent frames and their end connections in way of transverse sections)

Thickness gaugings in way of the ballast tank


1) At least one section is to include a ballast tank within 0.5 imageamidships.


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Guidance Relating to the Rules for the Classification of Steel Ships 2015 165

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 11 Extent of thickness measurements at Special Survey - Chemical Tankers with ESP notation



No. of Special Survey


Extent and location of measurement


Special Survey No. 1


image

(1) Suspect areas

(2) One transverse section of deck plating for the full beam of the ship within the cargo area (in way of a ballast tank, if any, or a cargo tank used primarily for water ballast)

(3) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey


Special Survey No. 2


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, one transverse section

(4) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(5) Selected wind and water strakes outside the cargo area


166 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 11 Extent of thickness measurements at Special Survey - Chemical Tankers with ESP notation (continued)


No. of Special Survey


Extent and location of measurement


Special Survey No. 3


image


(1) Suspect area

(2) Within the cargo area, each deck plate

(3) Within the cargo area, two transverse sections1)

(4) Within the cargo area, all wind and water strakes

(5) Measurements, for general assessment and recording of corrosion pattern, of those struc- tural members subject to Close-up Survey

(6) Selected wind and water strakes outside the cargo area


Special Survey No. 4

and Subsequent


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, three transverse sections1)

(4) Within the cargo area, each bottom plate

(5) Measurements, for general assessment and recording of corrosion pattern, of those struc- tural members subject to Close-up Survey

(6) All wind and water strakes, full length

(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)

Thickness gaugings for the transverse section(including longitudinal members, for transversely framed vessels including adjacent frames and their end connections in way of transverse sections)

Thickness gaugings in way of the ballast tank


1) At least one section is to include a ballast tank within 0.5 imageamidships.


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Guidance Relating to the Rules for the Classification of Steel Ships 2015 167

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 12 Extent of thickness measurements at Special Survey - Double Hull Oil Tankers with ESP notation



No. of Special Survey


Extent and location of measurement


Special Survey No. 1


image


(1) Suspect areas

(2) One section of deck plating for the full beam of the ship within the cargo area

(3) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey


Special Survey No. 2


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, one transverse section

(4) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(5) Selected wind and water strakes outside the cargo area


168 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 12 Extent of thickness measurements at Special Survey - Double Hull Oil Tankers with ESP notation (continued)


No. of Special Survey


Extent and location of measurement


Special Survey No. 3


image

(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, two transverse sections1)

(4) Within the cargo area, all wind and water strakes

(5) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(6) Selected wind and water strakes outside the cargo area


Special Survey No. 4


image


(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, three transverse sections1)

(4) Within the cargo area, each bottom plate

(5) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(6) All wind and water strakes, full length

(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)

Thickness gaugings for the transverse section(including longitudinal members, for transversely framed vessels including adjacent frames and their end connections in way of transverse sections)

Thickness gaugings in way of the ballast tank


1) At least one section is to include a ballast tank within 0.5 imageamidships.


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Guidance Relating to the Rules for the Classification of Steel Ships 2015 169

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 13 Extent of thickness measurements at Special Survey - Double Skin Bulk Carriers with ESP notation



No. of Special Survey


Extent and location of measurement


Special Survey No. 1


(1) Suspect areas


Special Survey No. 2


image


(1) Suspect areas

(2) Within the cargo length, two transverse sections of deck plating outside line of car- go hatch openings

(3) Wind and water strakes in way of the two transverse sections considered (2) above

(4) Selected wind and water strakes outside the cargo length area

(5) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey


Special Survey No. 3


image


(1) Suspect areas

(2) Within the cargo length, each deck plate outside line of cargo hatch openings

(3) Within the cargo length, two transverse sections, one in the amidship area, outside line of cargo hatch openings

(4) Within the cargo length, all wind and water strakes

(5) Selected wind and water strakes outside the cargo length area

(6) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey


170 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 13 Extent of thickness measurements at Special Survey - Double Skin Bulk Carriers with ESP notation (continued)



No. of Special Survey


Extent and location of measurement


Special Survey No. 4


image

(1) Suspect areas

(2) Within the cargo length, each deck plate outside line of cargo hatch openings

(3) Within the cargo length, three transverse sections, one in the amidship area, outside line of cargo hatch openings

(4) Within the cargo length, each bottom plate

(5) All wind and water strakes, full length

(6) Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey

(NOTES)


Thickness gaugings for deck plates Thickness gaugings for side shell plates

Thickness gaugings for the transverse section(applied for plates only)


Thickness gaugings for the transverse section(including longitudinal members, for transversely framed vessels including adjacent frames and their end connections in way of transverse sections)


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Guidance Relating to the Rules for the Classification of Steel Ships 2015 171

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 14 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Bulk Carriers with ESP notation

1) Shell Structures


Structural Member

Extent of Measurement

Pattern of measurement


1. Bottom and Side Shell Plating

1) Suspect plate, plus four adjacent plates


2) See other tables for particulars on gauging in way tanks and cargo holds

1) 5 point pattern for each panel between longitudinals

2. Bottom/Side Shell Longitudinals

Minimum of three longitudinals in way of suspect areas

3 measurement in line across web

3 measurement on flange


2) Transverse Bulkheads in Cargo Holds


Structural member

Extent of Measurement

Pattern of measurement


1. Lower Stool

1) Transverse band within 25 mm of welded connection to inner-bottom

2) Transverse band within 25 mm of welded connection to shelf plate

1) 5 point between stiffeners over

1 metre length

2) 5 point between stiffeners over

1 metre length


2. Transverse Bulkhead

1) Transverse band at approximately mid height

2) Transverse band at part of bulkhead adjacent to upper deck or below upper stool shelf plate (for those ships fitted with upper stools)

1) 5 point pattern over 1 sq. metre of plating

2) 5 point pattern over 1 sq. metre of plating


3) Deck Structure including Cross Strips, Main Cargo Hatchways, Hatch Covers, Coamings and Topside Tanks


Structural Member

Extent of Measurement

Pattern of Measurement

1. Cross Deck Strip Plating


Suspect cross deck strip plating

5 point pattern between underdeck stiffeners over 1 metre length

2. Underdeck Stiffeners

1) Transverse members

2) Longitudinal member

1) 5 point pattern at each end and mid span

2) 5 point pattern on both web and flange


3. Hatch Covers

1) Side and end skirts, each 3 locations

2) 3 longitudinal bands, outboard strakes

(2) and centerline strake (1)

1) 5 point pattern at each location

2) 5 point measurement each band


4. Hatch

Coamings

Each side and end of coaming, one band lower 1/3, one band upper 2/3 of coam- ing


5 point measurement each band i.e. end or side coaming


5. Topside Ballast Tanks

1) Watertight transverse bulkheads

a) lower 1/3 of bulkhead

b) upper 2/3 of bulkhead

c) stiffeners

2) 2 representative swash transverse bulk- heads

a) lower 1/3 of bulkhead

b) upper 2/3 of bulkhead

c) stiffeners

3) 3 representative bays of slop plating

a) lower 1/3 of tank

b) upper 2/3 of tank

4) Longitudinals, suspect and adjacent

1)

a) 5 point pattern over 1 sq. metre of plating

b) 5 point pattern over 1 sq. metre of plating

c) 5 point pattern over 1 metre length 2)

a) 5 point pattern over 1 sq. metre of plating

b) 5 point pattern over 1 sq. metre of plating

c) 5 point pattern over 1 metre length


3)

a) 5 point pattern over 1 sq. metre of plating

b) 5 point pattern over 1 sq. metre of plating

4) 5 point pattern both web and flange over

1 metre length

6. Main Deck Plating


Suspect plates and adjacent (4)


5 point pattern over 1 sq. metre of plating

7. Main Deck Longitudinals

Minimum of 3 longitudinals where plat- ing measured

5 point pattern on both web and flange over 1 metre length


8. Web Frames

/Transverses


Suspect plates


5 point pattern over 1 sq. metre


172 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 14 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Bulk Carriers with ESP notation (continued)

4) Double Bottom and Hopper Structure



Structural Member


Extent of Measurement


Pattern of Measurement


1. Inner/Double Bottom Plating


Suspect plate plus all adjacent plates


5 point pattern for each panel between longitudinals over 1 metre length


2. Inner/Double Bottom Longitudinals


Three longitudinals where plates measured


3 measurements in line across web and

3 measurements on flange


3. Longitudinal Girders or Transverse Floors


Suspect plates


5 point pattern over about 1 square metre


4. Watertight Bulkhead

(W.T Floors)


1) lower 1/3 of tank

2) upper 2/3 of tank


1) 5 point pattern over 1 sq. metre of plating

2) 5 point pattern alternate plates over 1 sq. metre of plating


5. Web Frames


Suspect plating


5 point pattern over 1 sq. metre of plating


6. Bottom/Side Shell Longitudinals


Minimum of three longitudinals in way of suspect areas


3 measurements in line across web

3 measurements on flange


5) Cargo Holds



Structural Member


Extent of Measurement


Pattern of Measurement


1. Side Shell Frames


Suspect adjacent


frame frame


and


each


a) At each end and mid span : 5 point pattern of both web and flange

b) 5 point pattern within 25 mm of welded attachment of both shell and lower slope plate


Guidance Relating to the Rules for the Classification of Steel Ships 2015 173

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 15 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Oil Tankers, Ore/Oil Ships, Etc. with ESP notation

1) Bottom Structure



Structural Member


Extent of Measurement


Pattern of Measurement


1. Bottom Plating


Minimum of 3 bays across tank including aft bay Measurements around and under all bell mouths


5 point pattern for each panel between longitudinals and webs


2. Bottom Longitudinals


Minimum of 3 longitudinals in each bay where bottom plating measured


3 measurements in line across flange and

3 measurements on vertically web


3. Bottom Girders and Brackets


At fore and aft transverse bulkhead bracket toes and in centre of tanks


Vertical line of single measurements on web plating with one measurement between each panel stiffener, or a minimum of three measurements

Two measurements across face flat5 point pattern on girder/bulkhead brackets


4. Bottom Transverse Webs


3 webs in bays where bottom plating measured, with measurements at both ends and middle


5 points pattern over 2 square metre area Single measurements on face flat


5. Panel Stiffening


Where provided


Single measurements


2) Deck Structure



Structural Member


Extent of Measurement


Pattern of Measurement


1. Deck Plating


Two bands across tank


Minimum of three measurements per plate per band


2. Deck Longitudinals


Minimum of 3 longitudinals in each of two bands


3 measurements in line vertically on webs, and

2 measurements on flange (if fitted)


3. Deck Girders and Brackets


At fore and aft transverse bulk- head, bracket toes and in centre of tanks


Vertical line of single measurements on web plating with one measurement between each panel stiffener, or a minimum of three measurements

Two measurements across face flat. 5 point pattern on girder/bulkhead brackets


4. Deck Transverse Webs


Minimum of two webs with measurements at middle and both ends of span


5 points pattern over about 2 square metre areas Single measurements on face flat


5. Panel Stiffening


Where provided


Single measurement


174 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 15 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Oil Tankers, Ore/Oil Ships, Etc. with ESP notation (continued)

3) Side Shell and Longitudinal Bulkheads



Structural Member


Extent of Measurement


Pattern of Measurement


1. Deckhead and Bottom Strakes, and Strakes in way of Stringer Platforms


Plating between each pair of longitudinals in a minimum of 3 bays


Single measurement


2. All Other Strakes


Plating between every 3rd pair of longitudinals in same 3 bays


Single measurement


3. Longitudinals-deckhead and Bottom Strakes


Each longitudinal in same 3 bays


3 measurements across web and

1 measurement on flange


4. Longitudinals - All Others


Every third longitudinal in same

3 bays


3 measurements across web and

1 measurement on flange


5. Longitudinals - Bracket


Minimum of three at top middle and bottom of tank in same 3 bays


5 point pattern over area of bracket


6. Web Frames and Cross Ties


3 webs with minimum of three loca- tions on each web, including in way of cross tie connections


5 point pattern over about 2 square metre area, plus single measurements on web frame and cross tie face flats


4) Transverse Bulkheads and Swash Bulkheads


Structural Member

Extent of Measurement

Pattern of Measurement

1. Deckhead and Bottom Strakes, and Strakes in way of Stringer Platforms

Plating between pair of stiffeners at three locations - approx. 1/4, 1/2 and 3/4 width of tank


5 points pattern between stiffeners over 1 meter length


2. All Other Strakes

Plating between pair of stiffeners at middle location


Single measurement


3. Strakes in Corrugated Bulkheads

Plating for each change of scantling at centre of panel and a flange or fab- ricated connection


5 point pattern over about 1 square metre of plating


4. Stiffeners


Minimum of three typical stiffeners

For web, 5 point pattern over span between bracket connections (2 meas- urements across web at each bracket connection, and one at centre of span)For flange, single measurements at each bracket toe and at centre of span


5. Brackets

Minimum of three at top middle and bottom of tank


5 point pattern over areas of bracket


6. Deep Webs and Girders


measurements at toe of bracket and at centre of span

For web, 5 point pattern over about 1 square metre

3 measurements across face flat


7. Stringer Platforms


All stringers with measurements at both ends and middle

5 point pattern over 1 square metre of area plus single measurements near bracket toes and on face flats


Guidance Relating to the Rules for the Classification of Steel Ships 2015 175

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 16 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Chemical Tankers with ESP notation

1) Bottom, Inner Bottom and Hopper Structure


Structure Member

Extent of Measurement

Pattern of Measurement


1. Bottom, Inner Bottom and Hopper Structure Plating

Minimum of three bays across double bottom tank, including aft bay. Measurements around and under all suction bell mouths


5-point pattern for each panel be- tween longitudinals and floors


2. Bottom, Inner Bottom and Hopper Structure Longitudinals


Minimum of three longitudinals in each bay where bottom plating measured

Three measurements in line across the flange and three measurements on vertical web


3. Bottom Girders, including the watertight ones


At fore and aft watertight floor and in centre of tanks

Vertical line of single measurements on girder plating with one measure- ment between each panel stiffener, or a minimum of three measurements. Two measurements across face flat where fitted.


4. Bottom Floors, including the watertight ones

Three floors in bays where bottom plat- ing measured, with measurements at both ends and middle


5-point pattern over two square me- tre area


5. Hopper Structure Web Frame Ring


Three floors in bays where bottom plat- ing measured

5-point pattern over one square me- tre of plating. Single measurements on flange


6. Hopper Structure Transverse Watertight Bulkhead or Swash Bulkhead

· Lower 1/3 of the bulkhead

· 5-point pattern over one square

meter of plating

· Upper 2/3 of the bulkhead

· 5-point pattern over two square

metre of plating


· Stiffeners(minimum of three)

· For web, 5-point pattern over

span(two measurements across web at each end and one at centre of span)

· For flange, single measurements at

each end and centre of span

7. Panel Stiffening

Where applicable

Single measurements


2) Deck Structure


Structure Member

Extent of Measurement

Pattern of Measurement


1. Deck Plating


Two transverse bands across tank

Minimum of three measurements per plate per band


2. Deck Longitudinals

Every third longitudinal in each two bands with a minimum of one longitudinal

Three measurements in line vertically on webs and two measurements on flange(if fitted)


3. Deck Girders and Brackets


At fore and aft transverse bulk- head, bracket toes and in centre of tanks

Vertical line of single measurements on web plating with one measure- ment between each panel stiffener, or a minimum of three measurements. Two measurements across flange.

5 point pattern on girder/bulkhead brackets


4. Deck Transverse Webs

Minimum of two webs, with measurements at both ends and middle of span

5-point pattern over one square me- tre area. Single measurements on flange

5. Vertical Web and Transverse Bulkhead in Wing Ballast Tank for double hull design(two metres from deck)


Minimum of two webs, and both transverse bulkheads


5-point pattern over one square me- tre area

6. Panel Stiffening

Where applicable

Single measurements


176 Guidance Relating to the Rules for the Classification of Steel Ships 2015

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 16 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Chemical Tankers with ESP notation (continued)

3) Side Shell and Longitudinal Bulkheads


Structure Member

Extent of Measurement

Pattern of Measurement

1. Side Shell and Longitudinal

Bulkhead Plating

· Deckhead and Bottom Strakes, and Strakes in way of Horizontal Girders

· All Other Strakes


· Plating between each pair of longitudinals in a minimum of three bays(along the tank)

· Plating between every third pair of longi-

tudinals in same three bays


· Single measurement


· Single measurement

2. Side Shell and Longitudinal

Bulkhead Longitudinals on:

· Deckhead and Bottom Strakes

· All Other Strakes


· Each longitudinal in same three bays


· Every third longitudinal in same three bays


· 3 measurements across web and

1 measurement on flange

· 3 measurements across web and

1 measurement on flange

3. Longitudinals - Brackets

Minimum of three at top, middle and bottom of tank in same three bays

5-point pattern over area of bracket

4. Vertical Web and Transverse

Bulkheads of Double Side Tanks (excluding deckhead area):

· Strakes in way of Horizontal Girders

· Other Strakes


· Minimum of two webs and both transverse bulkheads

· Minimum of two webs and both transverse

bulkheads


· 5-point pattern over approx. two square metre area

· Two measurements between

each pair of vertical stiffeners


5. Web Frames and Cross Ties for Other Tanks than Double Side Tanks


Three webs with minimum of three locations on each web, including in way of cross tie connections and lower end bracket

5-point pattern over approx-

imately two square metre area of webs, plus single measurements

on flanges of web frame and cross ties


6. Horizontal Girders

Plating on each girder in a minimum of three bays

Two measurements between each

pair of longitudinal girder stiff- eners

7. Panel Stiffening

Where applicable

Single measurements


4) Transverse Watertight and Swash Bulkheads


Structure Member

Extent of Measurement

Pattern of Measurement


1. Upper and Lower Stool, where fitted

· Transverse band within 25 mm of welded connection to inner bottom/deck

plating

· Transverse band within 25 mm of welded connection to shelf plate


9-point pattern between stiffeners over one metre length

2. Deckhead and Bottom

Strakes, and Strakes in way of Horizontal Stringers

Plating between pair of stiffeners at three locations: approximately 1/4, 1/2 and 3/4 width of tank


5-point pattern between stiffeners over one metre length

3. All Other Strakes

Plating between pair of stiffeners at mid-

dle location

Single measurement

4. Strakes in Corrugated Bulkheads

Plating for each change of scantling at

centre of panel and at flange of fab- ricated connection

5-point pattern over about one square metre of plating


5. Stiffeners


Minimum of three typical stiffeners

For web, 5-point pattern over span be-

tween bracket connections (two meas- urements across web at each bracket

connection and one at centre of span). For flange, single measurements at each bracket toe and at centre of span

6. Brackets

Minimum of three at top, middle and bottom of tank

5-point pattern over area of bracket


7. Horizontal Stringers

All stringers with measurements at both ends and middle

5- oint pattern over one square

aremae, treplus single measurements near


8. Deep Webs and Girders

Measurements at toe of bracket and at centre of span

For web, 5-point pattern over about

one square metre. three measurements across face flat


Guidance Relating to the Rules for the Classification of Steel Ships 2015 177

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 17 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Double Hull Oil Tankers with ESP notation

1) Bottom, Inner Bottom and Hopper Structure


Structural Member

Extent of Measurement

Pattern of Measurement


1. Bottom, Inner Bottom and Hopper Structure Plating

Minimum of three bays across double bottom tank, including aft bay. Measurements around and under all suc- tion bell mouths


5-point pattern for each panel between longitudinals and floors

2. Bottom, Inner Bottom and Hopper Structure Longitudinals


Minimum of three longitudinals in each bay where bottom plating measured

Three measurements in line across flange and three measurements on verti- cal web


3. Bottom Girders, including the watertight ones


At fore and aft watertight floors and in centre of tanks

Vertical line of single measurements on girder plating with one measurement be- tween each panel stiffener, or a mini- mum of three measurements


4. Bottom Floors, including the watertight ones

Three floors in bays where bottom plat- ing measured, with measurements at both ends and middle


5-point pattern over two square metre area


5. Hopper Structure Web Frame Ring


Three floors in bays where bottom plat- ing measured

5-point pattern over one square metre of plating. Single measurements on flange


6. Hopper Structure Transverse Watertight Bulkhead or Swash Bulkhead


· Lower 1/3 of bulkhead

5-point pattern over two square metre of plating


· Upper 2/3 of bulkhead

· 5-point pattern over two square metre of plating


Stiffeners (minimum of three)

· For web, 5-point pattern over span (two measurements across web at each end and one at centre of span).

· For flange, single measurements at

each end and centre of span

7. Panel Stiffening

Where applicable

Single measurements


image

2) Deck Structure


Structural Member

Extent of Measurement

Pattern of Measurement


1. Deck Plating


Two transverse bands across tank

Minimum of three measurements per plate per band


2. Deck Longitudinals

Every third longitudinal in each of two bands with a minimum of one longi- tudinal

Three measurements in line vertically on webs and two measurements on flange (if fitted)


3. Deck Girders and Brackets (usually in cargo tanks only)


At fore and aft transverse bulkhead, bracket toes and in centre of tanks

Vertical line of single measurements on web plating with one measurement be- tween each panel stiffener, or a minimum of three measurements.

Two measurements across flange. 5-point pattern on girder/bulkhead brackets


4. Deck Transverse Webs

Minimum of two webs, with measure- ments at both ends and middle of span

5-point pattern over one square metre area. Single measurements on flange

5. Vertical Web and Transverse Bulkhead in Wing Ballast Tank (two metres from deck)


Minimum of two webs, and both trans- verse bulkheads


5-point pattern over one square metre area

6. Panel Stiffening

Where applicable

Single measurements


178 Guidance Relating to the Rules for the Classification of Steel Ships 2015

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 17 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Double Hull Oil Tankers with ESP notation (continued)

3) Structure in Wing Ballast Tanks


Structural Member

Extent of Measurement

Pattern of Measurement

1. Side Shell and Longitudinal Bulkhead Plating :

· Upper Strake and Strakes in

way of Horizontal Girders

· All Other Strakes


· Plating between each pair of longi- tudinals in a minimum of three bays (along the tank)

· Plating between every third pair of

longitudinals in same three bays


· Single measurement


· Single measurement

2. Side Shell and Longitudinal Bulkhead Longitudinals on :

· Upper Strake


· All Other Strakes


· Each longitudinal in same three bays


· Every third longitudinal in same three bays


· 3 measurements across web and 1 measurement on flange

· 3 measurements across web and 1 measurement on flange


3. Longitudinals - Brackets

Minimum of three at top, middle and bottom of tank in same three bays


5-point pattern over area of bracket

4. Vertical Web and Transverse Bulkheads (excluding deck- head area) :

· Strakes in way of Horizontal Girders

· Other Strakes


· Minimum of two webs and both transverse bulkheads

· Minimum of two webs and both transverse bulkheads


· 5-point pattern over approx. two square metre area

· two measurement between each pair of vertical stiffeners


5. Horizontal Girders

Plating on each girder in a minimum of three bays

Two measurements between each pair of longitudinal girder stiffeners

6. Panel Stiffening

Where applicable

Single measurements


4) Longitudinal Bulkheads in Cargo Tanks


Structural Member

Extent of Measurement

Pattern of Measurement

1. Deckhead and Bottom Strakes, and Strakes in way of the Horizontal Stringers of Transverse Bulkheads


Plating between each pair of longi- tudinal in a minimum of three bays


Single measurement


2. All Other Strakes

Plating between every third pair of lon- gitudinals in same three bays


Single measurement

3. Longitudinals on Deckhead and Bottom Strakes


Each longitudinal in same three bays

Three measurements across web and one measurement on flange


4. All Other Longitudinals

Every third longitudinal in same three bays

Three measurements across web and one measurement on flange


5. Longitudinals - Brackets

Minimum of three at top, middle and bottom of tank in same three bays


5-point pattern over area of bracket


6. Web Frames and Cross Ties


Three webs with minimum of three lo- cations on each web, including in way of cross tie connections

5-point pattern over approximately two square metre area of webs, plus single measurements on flanges of web frame and cross ties


7. Lower End Brackets (opposite side of web frame)


Minimum of three brackets

5-point pattern over approximately two square metre area of brackets, plus single measurements on bracket flang- es


Guidance Relating to the Rules for the Classification of Steel Ships 2015 179

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 17 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Double Hull Oil Tankers with ESP notation (continued)

5) Transverse Watertight and Swash Bulkheads in Cargo Tanks



Structural Member


Extent of Measurement


Pattern of Measurement


1.


Upper and Lower Stool, where fitted

· Transverse band within 25 mm of welded connection to inner bottom/deck plating

· Transverse band within 25 mm

of welded connection to shelf plate


5-point pattern between stiffeners over metre length


2.


Deckhead and Bottom Strakes, and Strakes in way of Horizontal Stringers


Plating between pair of stiffeners at three locations : approximately 1/4, 1/2 and 3/4 width of tank


5-point pattern between stiffeners over one metre length


3.


All Other Strakes


Plating between pair of stiffeners at middle location


Single measurement


4.


Strakes in Corrugated Bulkheads


Plating for each change of scantling at centre of panel and at flange of fabricated connection


5-point pattern over about one square metre of plating


5.


Stiffeners


Minimum of three typical stiffeners


For web, 5-point pattern over span be- tween bracket connections (two meas- urements across web at each bracket connection and one at centre of span). For flange, single measurements at each bracket toe and at centre of span


6.


Brackets


Minimum of three at top, middle and bottom of tank


5-point pattern over area of bracket


7.


Horizontal Stringers


All stringers with measurements at both ends and middle


5-point pattern over one square metre area, plus single measurements mear bracket toes and on flanges


180 Guidance Relating to the Rules for the Classification of Steel Ships 2015

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Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

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Table 18 Requirements for extent of thickness measurements

- Double Skin Bulk Carriers with ESP notation

1) Bottom, Inner Bottom and Hopper Structure

at those areas of substantial corrosion



Structural Member


Extent of Measurement


Pattern of Measurement


1. Bottom, Inner Bottom and Hopper Structure Plating


Minimum of three bays across dou- ble bottom tank, including aft bay. Measurements around and under all suction bell mouths


5-point pattern for each panel be- tween longitudinals and floors


2. Bottom, Inner Bottom and Hopper Structure Longitudinals


Minimum of three longitudinals in each bay where bottom plating measured


Three measurements in line across flange and three measurements on the vertical web


3. Bottom Girders, including the watertight ones


At fore and aft watertight floors and in centre of tanks


Vertical line of single measurements on girder plating with one measure- ment between each panel stiffener, or a minimum of three measure- ments


4. Bottom Floors, including the wa- tertight ones


Three floors in the bays where bot- tom plating measured, with measure- ments at both ends and middle


5-point pattern over two square me- tre area


5. Hopper Structure Web Frame Ring


Three floors in bays where bottom plating measured


5-point pattern over one square me- tre of plating. Single measurements on flange


6. Hopper Structure Transverse Watertight Bulkhead or Swash Bulkhead


· Lower 1/3 of bulkhead


· 5-point pattern over one square metre of plating


· Upper 2/3 of bulkhead


· 5-point pattern over two square metre of plating


· Stiffeners(minimum of three)


· For web, 5-point pattern over span(two measurements across web at each end and one at cen- tre of span).

· For flange, single measurements

at each end and centre of span


7. Panel Stiffening


Where applicable


Single measurement


Guidance Relating to the Rules for the Classification of Steel Ships 2015 181

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 18 Requirements for extent of thickness measurements at those areas of substantial corrosion

- Double Skin Bulk Carriers with ESP notation (continued)

2) Deck Structure including Cross Strips, Main Cargo Hatchways, Hatch Covers, Coamings and Topside Tanks



Structural Member


Extent of Measurement


Pattern of Measurement


1. Cross Deck Strip Plating


Suspect cross deck strip plating


5-point pattern between underdeck stiffeners over 1 metre length


2. Underdeck Stiffeners


1) Transverse members

2) Longitudinal members


1) 5-point pattern at each end and mid span

2) 5-point pattern on both web and flange


3. Hatch Covers


1) Side and end skirts, each three locations

2) Three longitudinal bands, outboard strakes(2) and centerline strake(1)


1) 5-point pattern at each location

2) 5-point measurement each band


4. Hatch Coamings


Each side and end of coaming, one band lower 1/3, one band upper 2/3 of coaming


5-point measurement each band i.e. end or sid coaming


5. Topside Ballast Tanks


1) Watertight transverse bulkhead

a) Lower 1/3 of bulkhead

b) Upper 2/3 of bulkhead

c) Stiffeners

2) Two representative swash transverse bulkheads

a) Lower 1/3 of bulkhead

b) Upper 2/3 of bulkhead

c) Stiffeners

3) Three representative bays of slope plating

a) Lower 1/3 of tank

b) Upper 2/3 of tank

4) Longitudinals, suspect and adjacent


1)

a) 5-point pattern over 1 sq. metre of plating

b) 5-point pattern over 1 sq. metre of plating

c) 5-point pattern over 1 metre length 2)


a) 5-point pattern over 1 sq. metre of plating

b) 5-point pattern over 1 sq. metre of plating

c) 5-point pattern over 1 metre length 3)

a) 5-point pattern over 1 sq. metre of plating

b) 5-point pattern over 1 sq. metre of plating

4) 5-point pattern on both web and flange over

1 metre length


6. Main Deck Plating


Suspect plates and adjacent(4)


5-point pattern over 1 sq. metre of plating


7. Main Deck Longitudinals


Suspect plates


5-point pattern on both web and flange over 1 metre length


8. Web Frames/ Transverse


Suspect plates


5-oint pattern over 1 sq. metre of plating


182 Guidance Relating to the Rules for the Classification of Steel Ships 2015

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 18 Requirements for extent of thickness measurements at those

- Double Skin Bulk Carriers with ESP notation (continued)

3) Structure in Double Side Spaces(including Wing Void Spaces of Ore Carriers)

areas of substantial corrosion



Structural Member


Extent of Measurement


Pattern of Measurement


1. Side Shell and Inner Plating :

· Upper strake and strakes

in way of horizontal girders


· All other strakes


· Plating between each pair of trans- verse frames/longitudinals in a mini- mum of three bays(along the tank)

· Plating between every third pair of longitudinals in same three bays


· Single measurements


· Single measurements


2. Side Shell and Inner Side Transverse Frames/ Longitudinals on :

· Upper strake


· All other strakes


· Each transverse frame/longitudinal in same three bays

· Every third transverse frame/longi- tudinal in same three bays


· Three measurements across web and 1 measurement on flange

· Three measurements across web and 1 measurement on flange


3. Transverse Frames/Longitudinals Brackets


Minimum of three at top, middle and bottom of tank in same three bays


5-point pattern over area of bracket


4. Vertical Web and Transverse Bulkheads :

· Strakes in way of horizontal girders

· Other strakes


· Minimum of two webs and both transverse bulkheads

· Minimum of two webs and both transverse bulkheads


· 5-point patterns over approx. two square metre area

· Two measurements between each pair of vertical stiffeners


5. Horizontal Girders


Plating on each girder in a minimum of three bays


Two measurements between each pair of longitudinal girder stiffeners


6. Panel Stiffening


Where applicable


Single measurements


4) Transverse Bulkheads in Cargo Holds



Structural Member


Extent of Measurement


Pattern of Measurement


1. Lower Stool, where fitted




Transverse band within 25 mm of welded connection to inner bottom

Transverse band within 25 mm of welded connection to shelf plate


· 5-point pattern between stiff- eners over one metre length

· 5-point pattern between stiff- eners over one metre length


2. Transverse Bulkheads




Transverse band at approximately mid height


Transverse band at part of bulkhead adjacent to upper deck of below upper stool shelf plate(for those ships fitted with upper stools)


· 5-point pattern over one square metre of plating

· 5-point pattern over one square metre of plating


Guidance Relating to the Rules for the Classification of Steel Ships 2015 183

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 19 General Particulars


GENERAL PARTICULARS


Ship’s name : IMO Number :

Class Identification number : Port of registry :

Gross tons : Deadweight : Date of build :

Classification society :


image


Name of Company performing thickness measurement : Thickness measurement company certified by : Certificate No. :

Certificate valid from to

Place of measurement : First date of measurement : Last date of measurement :

Special survey/intermediate survey due :* Details of measurement equipment : Qualification of operator :

image


Report Number : consisting of Sheets


image


Name of operator : Signature of operator : Company official stamp :

Name of surveyor : Signature of surveyor : Classification Society Official Stamp :


* Delete as appropriate


184 Guidance Relating to the Rules for the Classification of Steel Ships 2015

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 20-1 Thickness measurements reports - Non-CSR Ships

Table 20-1 is to be used to vessels not built under IACS Common Structural Rules(Pt 11, Ships)


Pt 12 or Pt 13)(i.e. Non-CSR


TM1-T/DHT/BC/DSBC/GE*

Report on THICKNESS MEASUREMENT of ALL DECK PLATING / ALL BOTTOM SHELL PLATING / ALL SIDE SHELL PLATING*

STRAKE POSITION

PLATE POSITION


No. or Letter

Org. Thk. mm

Forward Reading

Aft Reading

Mean Diminution

%

M.A.D

Gauged

Diminution P

Diminution S

Gauged

Diminution P

Diminution S

P

S

mm

%

mm

%

P

S

mm

%

mm

%

P

S

mm

15th forward

14th

13th

12th

11th

10th

9th

8th

7th

6th

5th

4th

3rd

2nd

1st

Amidships

1st aft

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

13th

14th

15th

Ship's Name : Class Identity No. : Report No. :


Operators Signature : (NOTES)

1. This report form is to be used for recording the thickness measurement of : All strength deck plating within the cargo (length) area

All keel, bottom shell plating and bilge plating within the cargo (length) area

Side shell plating including selected wind and water strakes outside cargo (length) area

All wind and water strakes within cargo (length) area

2. The strake position is to be clearly indicated as follow :

2.1 For strength deck indicate the number of the strake of plating inboard from the stringer plate.

2.2 For bottom plating indicate the number of the strake of plating outboard from the keel plate.

2.3 For side shell plating give number of the strake of plating below sheerstrake and letter as shown on shell expansion.

3. For the ships which have no wide cargo openings i.e oil tankers all deck plating strakes are to be recorded, for the

ships which have wide cargo openings i.e ore/oil ships and bulk carriers only the deck plating strakes outside line of

openings are to be recorded.

4. Measurements are to be taken at the forward and aft areas of all plates and where plates cross ballast and cargo

tank/hold boundaries separate measurements for the area of plating in way of each type of tank/hold are to be recorded.

5. The single measurements recorded are to represent the average of multiple measurements.

6. The maximum allowable diminution could be stated in an attached document.


* T

DHT BC DSBC GE M.A.D

: delete as appropriate

: Oil Tankers and Chemical Tankers with ESP notation

: Double Hull Oil Tankers with ESP notation

: Bulk Carriers with ESP notation

: Double Skin Bulk Carriers with ESP notation

: Others

: Maximum Allowable Diminution


Guidance Relating to the Rules for the Classification of Steel Ships 2015 185

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 20-1 Thickness measurements reports - Non-CSR Ships

TM2-T/DHT/BC/DSBC/GE(i)*

(continued)

Report on THICKNESS MEASUREMENT OF SHEERSTRAKE AND DECK PLATING AT TRANSVERSE SECTIONS

(one, two or three transverse sections)

Ship's Name : Class Identity No. : Report No. :

STRENGTH DECK AND SHEERSTRAKE PLATING

FIRST TRANSVERSE SECTION AT FRAME NUMBER :

SECOND TRANSVERSE SECTION AT FRAME NUMBER :

THIRD TRANSVERSE SECTION AT FRAME NUMBER :


STRAKE POSITION


No. or Letter

Org. Thk.


M.A.D


Gauged

Diminution P

Diminution S


No. or Letter

Org. Thk.


M.A.D


Gauged

Diminution

P

Diminution

S


No. or Letter

Org. Thk.


M.A.D


Gauged

Diminution

P

Diminution

S

mm

mm

P

S

mm

%

mm

%

mm

mm

P

S

mm

%

mm

%

mm

mm

P

S

mm

%

mm

%

Stringer Plate

1st strake inboard

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

13th

14th

centre strake

sheer strake

TOPSIDE TOTAL


Operators Signature :


(NOTES)

1. This report form is to be used for recording the thickness measurements of :

- Strength deck plating and sheerstrake plating transverse sections :

One, two or three sections within the cargo (length) area comprising of the following structural items :


(1) Strength deck plating

(2) Stringer plate

(3) Sheerstrake


2. For the ships which have no wide cargo openings i.e oil tankers all deck plating strakes are to be recorded, for the ships which have wide cargo openings i.e ore/oil ships and bulk carriers only the deck plating strakes outside line of openings are to be recorded.

3. The topside area comprises deck plating, stringer plate and sheerstrake (including rounded gunwales)

4. The exact frame station of measurement is to be stated.

5. The single measurements recorded are to represent the average of multiple measurements.

6. The maximum allowable diminution could be stated in an attached document.


* : delete as appropriate


186 Guidance Relating to the Rules for the Classification of Steel Ships 2015

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 20-1 Thickness measurements reports - Non-CSR Ships

TM2-T/DHT/BC/DSBC/GE(ii)*

Report on THICKNESS MEASUREMENT OF SHELL AND BOTTOM PLATING

(one, two or three transverse sections)

(continued)


AT TRANSVERSE SECTIONS

Ship's Name : Class Identity No. : Report No. :

SHELL AND BOTTOM PLATING

FIRST TRANSVERSE SECTION AT FRAME NUMBER :

SECOND TRANSVERSE SECTION AT FRAME NUMBER :

THIRD TRANSVERSE SECTION AT FRAME NUMBER :


STRAKE POSITION


No. or Letter

Org. Thk.


M.A.D


Gauged

Diminution P

Diminution S


No. or Letter

Org. Thk.


M.A.D


Gauged

Diminution

P

Diminution

S


No. or Letter

Org. Thk.


M.A.D


Gauged

Diminution

P

Diminution

S

mm

mm

P

S

mm

%

mm

%

mm

mm

P

S

mm

%

mm

%

mm

mm

P

S

mm

%

mm

%

1st below sheer strake

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

13th

14th

15th

16th

17th

18th

19th

20th

keel strake

BOTTOM TOTAL


Operators Signature :


(NOTES)

1. This report form is to be used for recording the thickness measurements of :

- Shell and bottom plating transverse sections :

One, two or three sections within the cargo (length) area comprising of the following structural items :


(1) Side shell plating

(2) Bilge plating

(3) Bottom shell plating

(4) Keel plate


2. The bottom area comprises keel, bottom and bilge plating.

3. The exact frame station of measurement is to be stated.

4. The single measurements recorded are to represent the average of multiple measurements.

5. The maximum allowable diminution could be stated in an attached document.


* : delete as appropriate


Guidance Relating to the Rules for the Classification of Steel Ships 2015 187

image

Pt 1 Classification and Surveys

Annex 1-5 Thickness Measurement Method for Hull Structural Member Pt 1, Annex 1-5

image


Table 20-1 Thickness measurements reports - Non-CSR Ships

TM3-T/DHT/BC/DSBC/GE*

(continued)

Report on THICKNESS MEASUREMENT OF LONGITUDINAL MEMBERS AT TRANSVERSE SECTIONS

(one, two or three transverse sections)

Ship's Name : Class Identity No. : Report No. :

FIRST TRANSVERSE SECTION AT FRAME NUMBER :

SECOND TRANSVERSE SECTION AT FRAME NUMBER :

THIRD TRANSVERSE SECTION AT FRAME NUMBER :

STRUCTURE MEMBER

Item No.

Org. Thk.

M.A.D

Gauged

Diminution P

Diminution S

Item No.

Org. Thk.

M.A.D

Gauged

Diminution P

Diminution S

Item No.

Org. Thk.

M.A.D

Gauged

Diminution P

Diminution S

mm

mm

P

S

mm

%

mm

%

mm

mm

P

S

mm

%

mm

%

mm

mm

P

S

mm

%

mm

%