CHAPTER 2 CLASSIFICATION SURVEYS

2100. Classification Surveys during Construction 2101. General

1. In the Classification Survey during Construction, the hull structures, hull equipment, machinery, fire protection and detection, fire extinction, electrical installation, stability and load lines are to be ex- amined in order to ascertain that they meet the relevant requirements of the Rules.

2. New installation of materials which contain asbestos is to be prohibited.

2102. Plans and documents

When a floating dock is intended to be classed with the Society, plans and documents showing the scantlings, arrangements and details of the principal parts of the structure, and relevant data are to be submitted for review or approval. Plans for approval are generally to be submitted in triplicate. In general, these plans and documents are to include the following (1) and (2) where applicable.

(1) Plans for approval

(a)

General arrangement plan

(b) Transverse section scantlings at mid-length of dock

(c)

Structural plans of the wing walls and pontoons

(d) Structural plans of the decks and bulkheads

(e)

(f)

Pumping arrangements

Machinery and electrical plans

(g) Piping systems (diagram)

(h) Fire extinguishing arrangements

(i)

(j)

Particulars of indicator systems for tank water level and drafts Particulars of deflection indicating system

(2) Information

(a)

Specifications

(b) Stability calculations and hydrostatic curves

(c)

Calculations and data for longitudinal, transverse and local strength

(d) Operating manual including ballasting manual

(e)

(f)

Tank arrangements showing also maximum service heads and heights of overflows and air pipes and where used in design, data showing the maxi-mum differential service head

Data relating to overall load due to crane including hook load and arrangement if cranes are installed

(g) Coating specifications

(h) Testing schemes

2103. Survey of the work

From the commencement of the work until the completion of the dock, the Surveys during con- struction are to examine the materials, workmanship and arrangements.

2104. Testing

In the classification surveys during construction, the following tests are to be carried out.

(1) Tank testing

All tanks including those used for void tanks and cofferdams are to be separately tested by a head of water to the highest point to which the liquid will rise in service. Where the scantlings of a tank boundary are based on the maximum differential head in service, care is to be taken

to ensure test heads do not exceed the design differential head. On submission of a1l detail, air testing or hose testing may be considered as an alternative to the foregoing.

(2) Completion trials

necessary

On the completion of the dock, trials are to be carried out

(a) The freeboard to top deck with the dock flooded.

(b) The light displacement and the lifting capacity of the

to ascertain following :

dock corresponding to the minimum

(c)

freeboard.

The position of the centre of gravity by an inclining test. Where it is difficult to calculate an accurate centre of gravity by inclining test, the lightweight displacement shall be obtained through lightweight survey and centre of gravity shall be determined by calculation.

(d) Any built-in permanent deflection in the initial condition. The initial condition is a condition that all tanks for consumables (fresh water, fuel oil etc.) are completely filled, but all other tanks are empty, only rest ballast water remaining in the ballast tanks. The travelling cranes may be parked in positions giving equal draughts forward and aft.

(e)

Correct calibration of deflection meters by simulating the most severe intended loading con-

dition as far as practicable.

(3) General systems

The machinery pumps, piping remote control/automatic control, instrumentation and fire-ex- tinguishing system are to be tested at the makers in accordance with the Rules for Classification

of Steel Ships as applicable. The Society may, however, omit the surveys or inspection in the presence of the Surveyor at the makers, subject to submission of the maker's certificate and sat-

isfactory performance witnessed by the Surveyor after installation. All machinery and systems re- lating to the classification of the dock are to be functionally tested after installation in the pres- ence of the Surveyor.

(4) Electrical equipment

The following tests and inspections are to be carried out for electrical equipment after in- stallation on the docks.

(a)

Insulation resistance test

(b) Operation test of the essential electrical equipment

(c)

Other tests and inspections as considered necessary by the Society.

2200. Classification Survey after construction

2201. Submission of plans and documents

Plans showing the main scantlings and arrangements of the actual dock and documents specified in 2101. are to be submitted for approval. Records and reports relating to the construction of the dock should be submitted as may be required by the Society.

2202. Survey

In all cases the full requirements of 2303. are to be carried out. During the survey, the Surveyors are to satisfy themselves regarding the workmanship and verify the approved scantlings and arrangements. For this purpose, and in order to ascertain the amount of any deterioration, parts of the structure will be required to be drilled as necessary, or alternatively to be measured by using appropriate methods to determine the actual thickness. However, docks of recent construction wi1l receive special consideration.

2300. Periodical Survey and Occasional Survey 2301. General

1. To retain its class with the Society, a dock in normal service is to be subjected to periodical sur- veys and survey of alternations, damages and repairs in accordance with the provisions in the fol- lowing 2302. to 2304.

2. The requirements of the Rules for the classification of Steel Ships also apply as may be relevant to docks, unless otherwise specified in 2300. of this chapter.

2302. Intermediate surveys

1. Intermediate Surveys are to be carried out within 3 months before or after the second or the third anniversary date from the completion date of the initial classification Survey or of the previous Special Survey.

2. At each Intermediate Survey the following parts are to be examined and placed in good condition.

(1) Pontoon, safety and top decks, wing wall plating above the light waterline, keel and side blocks and their foundations.

(2) Vents and overflow pipes, air pipes extending below decks to form air cushions and overboard

scuppers.

(3) Companionways, ladders, and handrails and other means of protection that might be provided for access to all spaces.

(4) Deflection indicating system

(5) Arrangement of fire protection and extinguishing.

(6) Machinery, pumps and other equipment.

3. The boilers(if any) are to be examined at each intermediate Survey in accordance with the relevant of the Rules for the classification of Steel Ships.

2303. Special survey

1. The first Special Survey is to be completed within 5 years from the date of initial classification Survey and thereafter within 5 years from the credited date of the previous Special Survey.

2. At each Special Survey, the compliance with all Intermediate Survey requirements and the follow- ing requirements are to be examined.

(1) Condition of means of protection to openings.

(2) Pontoon and wing wall thanks are to be cleaned examined internally, and water tested to the satisfaction of the Surveyor. At the discretion of the Surveyor, fuel oil tanks forming part of the main structure need not be examined internally until the dock is more than 15 years old.

(3) Spaces above safety deck are to be examined internally, removing linings, etc. where necessary for inspection. Air pipes extending below deck to form air cushions are also to be examined.

(4) Where the surface of plating is covered with cement, composition, or wood sheathing, the cov-

ering is to be removed as may be required for examination of the plating.

(5) The thickness of any part of the structure where wastage is evident may be required by the Surveyor to be determined by an approved method. Where necessary the structure is to be renewed.

(6) The shell plating below the light waterline is to be examined.

3. At the Special Survey after the dock is 20 years old, and at 10 years intervals thereafter, in addi- tion to the requirements of the preceeding 2, the thicknesses of the structure are to be determined

by an approved method to assess the general condition. within the 0.4 Ã mid-length of the dock.

Two belts of gauging are to be made

4. Survey of the outer bottom below the light waterline is may be carried out by some combination of :

(1) Ultrasonic measurement of plate thickness.

(2) Heeling of the dock for partial examination of the bottom.

(3) Underwater photography.

(4) Underwater television.

(5) Examination by diver.

5. For the extension of intervals of the examination below the waterline, special consideration may be given by the Society taking into account the condition of the dock, painting method and corrosion protection.

6. Surveys of boilers are to be in accordance with the requirements of Pt 1, Ch 2, Sec 8 of the Rules for the Classification of Steel Ships.

Surveys of machinery, piping systems relevant requirements of Pt 1, Ch 2, far as applicable.

and electrical equipment are to be in accordance with the

Sec 5 of the Rules for the Classification of Steel Ships as

2304. Damage and lteration

Damage or alteration to structure, machinery or equipment, which affects or may

affect classi-

fication, is to be submitted by the owners or their representatives for examination by the Surveyor. This examination is to be requested by the owners or their representatives.

2400. Cooperation for the survey

All such preparations as required for the survey to be carried out as well as those which may be required by the Surveyor as necessary in accordance with the requirements in the Rules are to be made by the applicant of the survey.

The survey may be suspended where necessary preparations have not been made or any appropriate

attendant is not present.