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英国船级社检测规范2017

Thickness measurement and close-up survey guidance

Part 3, Special survey requirements

Bulk carriers

NOVEMBER 2016 Ver.7.3

Working together for a safer world

Contents Part 3 Part 3 – Special Survey Requirements

Chapter 1 Thickness Measurement Requirements (3.1)

Section 1 Single and Double Skin Bulk Carriers (3.1.1) Chapter 2 Close-Up Survey Requirements (3.2)

Section 1 Single Skin Bulk Carriers (3.2.1)

2 Double Skin Bulk Carriers (3.2.2)

3 Ore Carriers (3.2.3) Chapter 3 Substantial Corrosion (3.3)

Section 1 Single Skin Bulk Carriers – Shell Plating and Stiffening (3.3.1)

with Substantial Corrosion

2Single Skin Bulk Carriers – Double Bottom and Hopper (3.3.2)

Structure with Substantial Corrosion

3Single and Double Skin Bulk Carriers – Transverse (3.3.3)

Bulkheads in Cargo Holds with Substantial Corrosion

4Single and Double Skin Bulk Carriers – Deck Structure (3.3.4)

including Cross Strips, Main Cargo Hatchways, Hatch Covers,

Coamings and Topside Tanks with Substantial Corrosion

5Double Skin Bulk Carriers – Bottom, Inner Bottom and (3.3.5)

Hopper Structure with Substantial Corrosion

6Double Skin Bulk Carriers – Double Side Space (3.3.6)

Structure, (including Wing Void spaces of Ore Carriers)

with Substantial Corrosion

3.1 Thickness Measurement Requirements

Table 3.1.1 Minimum requirements for thickness measurement - Single skin and Double Skin Bulk Carriers (Including Ore Carriers)

Requirements based on Pt 1, Ch 3,6 TABLE 3.6.4 of the Rules and Regulations for the Classification of Ships

SPECIAL SURVEY I (Ships 5 Years Old)

(1) Suspect areas, as required by the Surveyor. See Note 5.

SPECIAL SURVEY II (Ships 10 Years Old)

(1) Within Cargo Length Area:

(a) two transverse sections of deck plating outside line of cargo hatch openings. See Note 7.

(2) Measurement for general assessment and recording of corrosion pattern, of those structural members subject to Close-up Survey in accordance with Table 3.6.1 Minimum requirements for Close-up Survey - Single skin bulk carriers, Table 3.6.2 Minimum requirements for Close-up Survey - Double skin bulk carriers (excluding ore carriers) or Table 3.6.3 Minimum requirements for Close-up Survey - Ore carriers. See Notes 3 and 4.

(3) Wind and water strakes in way of the transverse sections considered in (1).

(5) Suspect areas, as required by the Surveyor. See Note 5.

SPECIAL SURVEY III (Ships 15 Years Old)

(1) Within the cargo length area:

(a) Each deck plate outside line of cargo hatch openings

(1) Within the cargo length area:

(b) 2 transverse sections, outside line of cargo hatch openings. (A minimum of 1 of the above transverse sections is to be within 0.5L amidships). See Notes 2 and 6.

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

(5) Suspect areas, as required by the Surveyor. See Note 5.

SPECIAL SURVEY IV (Ships 20 Years Old)

(1) Within the cargo length area:

(a) each deck plate outside line of cargo hatch openings.

(1) Within the cargo area:

(b) 3 transverse sections, outside line of cargo hatch openings. (A minimum of 2 of the above transverse sections is to be within 0,5L amidships.) See Notes 2 and 6.

(1) Within the cargo length area:

(3) All wind and water strakes over the full length of the ship, port and starboard. (Wind and Water Strake: the strakes of a ship’s side shell plating between the ballast and the deepest load waterline).

(4) Remaining exposed main deck plates not considered in item (1) and representative exposed superstructure deck plating (i.e. poop, bridge and forecastle deck).

(5) All keel plates outside the cargo length area. Also additional bottom plates in way of cofferdams. Machinery space and aft end of tanks.

(6) Plating of sea chests. Also side shell plating in way of overboard discharges, as considered necessary by the Surveyor.

(7) Suspect areas, as required by the Surveyor. See Note 5.

Note The requirements in this table apply to both single skin and double skin ships unless stated otherwise.

Note 1. For areas in spaces (cargo holds and water ballast tanks) where coatings are found to be in GOOD condition, as defined in Pt 1, Ch 3, 1.5 Definitions, the extent of thickness measurement may be specially considered, but not dispensed with in its entirety.

Note 2. Transverse sections should be chosen where the largest scantling diminution is likely to occur, or as revealed by deck or bottom plating measurement.

Note 3. For ships assigned the notations ESN-Hold 1 and ESN All Holds, the corrugated part of the aft transverse bulkhead of the forward cargo hold is to be subject to thickness measurement. This is to include each vertical corrugation at its lower and middle level including shedder plates and gusset plates, where applicable.

Note 4. Single skin bulk carriers contracted for construction prior to 1 July 1998 are to undergo a re-assessment of their cargo hold shell frames in accordance with the Provisional Rules for Existing Ships. The number of shell frames to be measured is equivalent to the number of shell frames subject to Close-up Survey (see Pt 1, Ch 3, Table 3.6.1 Minimum requirements for Close-up Survey – Single skin bulk carriers), with representative measurements to be taken at specific areas for each frame.

Note 5. Suspect Areas are locations showing substantial corrosion and/or are considered by the surveyor to be prone to rapid wastage.

Note 6. A transverse section includes all continuous longitudinal members such as plating, longitudinals and girders at the deck, sides, bottom, inner bottom, hopper sides, longitudinal bulkheads, inner sides, top wing inner sides and bottom of top wing tanks. For transversely framed vessels, a transverse section includes adjacent frames and their end connections in way of transverse sections.

Note 7. Deck Plating outside line of cargo hatch openings is deck plating between the ship sides and hatch coamings in the transverse section concerned.

3.2 Close-Up Survey Requirements

Table 3.2.1 Minimum requirements for Close-up Survey - Single Skin Bulk Carriers Requirements based on Pt 1, Ch 3,6 TABLE 3.6.1 of the Rules and Regulations for the Classification of Ships

SPECIAL SURVEY I (Ships 5 Years Old)

(1) 25% of shell frames and their end attachments in

the forward cargo hold at representative positions.

(2) Selected shell frames and their end attachments in

remaining cargo holds.

(3) 1 transverse web with associated plating

and longitudinals in 2 representative water

ballast tanks of each type (i.e. topside, peak,

double bottom and hopper side tank).

(4) 2 selected cargo hold transverse bulkheads,

including internal structure of upper and lower

stools, where fitted. This is to include the aft

bulkhead of the forward hold. See Note 1.

(5) All cargo hatch covers and coamings (plating and stiffeners). See Note 2.

SPECIAL SURVEY II (Ships 10 Years Old)

(1) a – For bulk carriers with a deadweight less

than 100,000 tonnes, all shell frames in the

forward cargo hold and 25% of frames in each of

the remaining cargo holds, including their upper

and lower end attachments and adjacent shell

plating.

(1) b – For bulk carriers with a deadweight equal

to or greater than 100,000 tonnes, all shell

frames in the forward cargo hold and 50 % of

frames in each remaining cargo hold, including

their upper and lower end attachments and

adjacent shell plating.

(2) 1 transverse web with associated plating

and longitudinals in each water ballast tank

(3) Forward and aft transverse bulkhead

in 1 side ballast tank, including stiffening

system

(4) All cargo hold transverse bulkheads including

internal structure of upper and lower stools, where

fitted. See Note 1.

(5) All cargo hatch covers and coamings (plating and stiffeners). See Note 2.

hatches

SPECIAL SURVEY III (Ships 15 Years Old)

(1) All shell frames in the forward and one other

selected cargo hold and 50% of frames in each of

the remaining cargo holds, including their upper

and lower end attachments and adjacent shell

plating.

(2) All transverse webs with associated

plating and longitudinals in each water

ballast tank.

(3) All transverse bulkheads in ballast

tanks, including stiffening system.

(4) All cargo hold transverse bulkheads including

internal structure of upper and lower stools, where

fitted. See Note 1.

(5) All cargo hatch covers and coamings (plating and stiffeners). See Note 2.

hatches.

SPECIAL SURVEY IV (Ships 20 Years Old)

(1) All shell frames in all cargo holds, including

their end attachments and adjacent shell plating.

(2) All transverse webs with associated plating

and longitudinals in each water ballast tank.

(3) All transverse bulkheads in ballast tanks,

including stiffening system

(4) All cargo hold transverse bulkheads including

internal structure of upper and lower stools, where

fitted. See Note 1.

(5) All cargo hatch covers and coamings (plating and stiffeners). See Note 2.

hatches

Note 1. Close-up Survey of transverse bulkheads to be carried out at four levels:

Level (a) Immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships without lower stool.

Level (b) Immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately above the line of the shedder plates.

Level (c) About mid-height of the bulkhead.

Level (d) Immediately below the upper deck plating and immediately adjacent to the upper wing tank and immediately below the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks.

Note 2. Subject to cargo hold hatch covers of approved design (which structurally have no access to the internals), close-up survey/thickness measurement shall be done of accessible parts of hatch covers structures.