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 :

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)

Elements

Cracks

Buckling

Corrosion

Coating Cond.

Pitting

Rep., Mod

Other

Deck

Bottom

Side

Longi. BHD

Trans BHD

Owners Inspection Report(Structural Condition)

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

Grade of Steel :

· Deck : ․ Side :

· Bottom : ․ Longi. BHD :

· Trans. BHD :

Repairs carried out due to :

Thickness measurements carried out :

· Date :

· Result in General :

Overdue Survey :

Outstanding Conditions of Class : Comments :

Date of Inspection : Inspected by : Signature :

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

Location

Measuring Points

Deck and upper

structures

Special attention is to be given on fore parts (forward of 0.5 amidships) 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 amidships.

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

-

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.

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)

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. mark : means the location to be measured.

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

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.

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

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. mark : means the location to be measured.

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

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

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).

No. of Special Survey

Extent and location of measurement

Special Survey No. 1

(1) Suspect areas throughout the vessel

Special Survey No. 2

(1) Suspect areas throughout the vessel

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

Special Survey No. 3

(1) Suspect areas throughout the vessel

(2) Two transverse sections within the amidships 0.5 in 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)

No. of Special Survey

Extent and location of measurement

Special Survey No. 4

and Subsequent

(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.

No. of Special Survey

Extent and location of measurement

Special Survey No. 1

(1) Suspect areas throughout the vessel

Special Survey No. 2

(1) Suspect areas throughout the vessel

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

Special Survey No. 3

(1) Suspect areas throughout the vessel

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

(3) Internals in forepeak and afterpeak tanks

No. of Special Survey

Extent and location of measurement

Special Survey No. 4

and Subsequent

(1) Suspect areas throughout the vessel

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

(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.

No. of Special Survey

Extent and location of measurement

Special Survey No. 1

(1) Suspect areas

Special Survey No. 2

(1) Suspect areas

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

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

structural members subject to Close-up Survey

Special Survey No. 3

(1) Suspect areas

(2) Two transverse sections within the amidships 0.5 in 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

No. of Special Survey

Extent and location of measurement

Special Survey No. 4

and Subsequent

(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.

No. of Special Survey

Extent and location of measurement

Special Survey No. 1

(1) Suspect areas

(2) One section of deck plating for the full beam of the ship within 0.5 amidships 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

(1) Suspect areas

(2) Within the cargo area, each deck plate

(3) Within the cargo area, one transverse section within 0.5 amidships 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

No. of Special Survey

Extent and location of measurement

Special Survey No. 3

(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

(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

No. of Special Survey

Structural members to be measured

Special Survey No. 4

and Subsequent

(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)

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.

No. of Special Survey

Extent and location of measurement

Special Survey No. 1

(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

(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

No. of Special Survey

Extent and location of measurement

Special Survey No. 3

(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

(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 amidships.

No. of Special Survey

Extent and location of measurement

Special Survey No. 1

(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

(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

No. of Special Survey

Extent and location of measurement

Special Survey No. 3

(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

(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 amidships.

No. of Special Survey

Extent and location of measurement

Special Survey No. 1

(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

(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

No. of Special Survey

Extent and location of measurement

Special Survey No. 3

(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

(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 amidships.

No. of Special Survey

Extent and location of measurement

Special Survey 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 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

(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

No. of Special Survey

Extent and location of measurement

Special Survey No. 4

(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)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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