Onderwerp: Bezoek-historie

336 The design concept of the "COULOMBI EGG" tanker
Geldigheid:13-11-1997 t/m Status: Geldig vandaag

Dit onderwerp bevat de volgende rubrieken.

The design concept of the "COULOMBI EGG" tanker

(Link: MARPOL I/13F)

  1. The Marine Environment Protection Committee, at its fortieth session (18 to 23 and 25 September 1997), approved in principle the design concept of the "Coulombi Egg" tanker in accordance with MARPOL 73/78 regulation I/13F(5) as an equivalent to the basic double hull requirement (MEPC 40/21, paragraph 3.28).

  2. The description of the "Coulombi Egg" tanker design concept is set out at annex to this circular.
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Annex

  1. A "Coulombi Egg" tanker is similar to a MARPOL regulation I/13F(4) tanker except for the arrangement in cargo side tanks (see midship section shown in the figure below). The fore peak, pump-room, engine-room, aft peak and accommodation should be of regulatory type and the centre cargo tank inside the longitudinal bulkhead located not less than B/5 from the side should be arranged with a MARPOL regulation I/13F(4) horizontal partition located not more than 0.55 D above baseline. The length of each centre tank should not exceed 0.2 L. The upper deck inside the longitudinal bulkhead may be raised to form a trunk. Cargo should only be carried in the lower cargo tanks, when the operating draught exceeds the minimum draught required by MARPOL regulation I/13F(4). The slop tanks should be located inside an upper centre tank. 80% of the total cargo capacity should be located inboard of the longitudinal bulkhead B/5 from the side.

  2. The entire cargo block should be arranged as follows:
  1. the side tank should be not less than B/5 wide (B = ship's beam);
  2. a horizontal partition (mid-deck) should be fitted not more than 0.45 D above baseline in the side tanks (D = ship's depth). The partition should be sloping 45¿ at the side and should be connected to a horizontal side cofferdam located between 0.25 D and 0.35 D above baseline. The minimum width of the side cofferdam should be 0.03B;

  • above the mid-deck and the cofferdam in the side tank should be segregated ballast tanks, the capacity of which, together with the fore and aft peaks, should meet all relevant MARPOL regulations;

  • below the mid-deck should be side cargo tanks. Each lower side cargo tank should forward and aft have an access trunk from the main deck. Cargo tank access trunks should be treated as part of the cargo tank when assessing oil outflow;

  • a partial oiltight transverse bulkhead should be fitted at half length of each lower side tank from the mid-deck to the lower edge of the side cofferdam. The purpose of the bulkhead should be to reduce outflow when side damage occurs which breaches the tank but does not extend beyond the partial bulkhead;

  • a tanker using above side tank concept should have cargo tanks generally subdivided as follows: length of tank body 0.78-0.8L between a 0.05L fore peak and a 0.15-0.17L aft end section with four or five lower centre cargo tanks, four of five upper centre tanks with slop tanks incorporated in the aftermost tank and four or five pairs of lower side tanks with a partial division as per .5 above at mid-length. For concept approval it was shown that the 5,000 tdw and 150,000 tdw tanker needed four groups of cargo tanks maximum 0.2L long and 60,000 tdw and 283,000 tdw tanker needed five groups of cargo tanks maximum 0.16L long ; and

  • the lower cargo centre tanks should be arranged as per MARPOL regulation I/13F(4).

Figure - Midship section

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