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(ii) the building contract is placed after 1 January 1974, or in cases where 
no building contract has previously been placed, the keel is laid or the tanker 
is at a similar stage of construction after 30 June 1974. 
(2) Cargo tanks of oil tankers shall be of such size and arrangements that the 
hypothetical outlow O, and O, calculated in accordance with the provisions of 
Regulation 23 of this Annex anywhere in the length of the ship does not exceed 
30,000 cubic metres or 400°/DW, which ever is the greater, but subject to a 
maximum of 40,000 cubic metres. 
(3) The volume of any one wing cargo oil tank of an oil tanker shall not ex- 
ceed seventy-five per cent of the limits of the hypothetical oil outflow referred to 
in paragraph (2) of this Regulation. The volume of any one centre cargo oil 
tank shall not exceed 50,000 cubic metres. However in segregated ballast oil 
tankers as defined in Regulation 13 of this Annex, the permitted volume of a 
wing cargo oil tank situated between two segregated ballast tanks, each exceed- 
ing 7. in length, may be increased to the maximum limit of hypothetical oil out- 
flow provided that the width of the wing tanks exceeds tc. 
(4) The length of each cargo tank shall not exceed 10 metres or one of the 
following values, whichever is the greater: 
(a) where no longitudinal bulkhead is provided : 
0.1L 
(b) where a longitudinal bulkhead is provided at the centreline only: 
0.15L 
(c) where two or more longitudinal bulkheads are provided : 
(i) for wing tanks: 
0.2L 
(ii) for centre tanks: 
(1) if 6:/B is equal to or greater than &%: 
0.2L 
(2) if b1/B is less than 4%: 
where no centreline longitudinal bulkhead is provided : 
vr (0.5 b:/B+0.1)L 
where a centreline longitudinal bulkhead is provided : 
(0.25 6,/B-++-0.15) L 
(5) In order not to exceed the volume limits established by paragraphs (2), 
(3) and (4) of this Regulation and irrespective of the accepted type of cargo 
transfer system installed, when such system interconnects two or more cargo 
tanks, valves or other similar closing devices shall be provided for separating 
the tanks from each other. These valves or devices shall be closed when the 
tanker is at sea. 
(6) Lines of piping which run through cargo tanks in a position less than ?¢. 
from the ship’s side or less than v. from the ship’s bottom shall be fitted with 
valves or similar closing devices at the point at which they open into any cargo 
tank. These valves shall be kept closed at sea at any time when the tanks contain 
cargo oil, except that they may be opened only for cargo transfer needed for the 
purpose of trimming of the ship. 
Regulation 25 
SUBDIVISION AND STABILITY 
(1) Every new oil tanker shall comply with the subdivision and damage 
stability criteria as specified in paragraph (3) of this Regulation, after the 
assumed side or bottom damage as specified in paragraph (3) of this Regulation, 
for any operating draught reflecting actual partial or full load conditions con- 
sistent with trim and strength of the ship as well as specific gravities of the 
cargo. Such damage shall be applied to all conceivable locations along the length 
of the ship as follows: ; 
(a) in tankers of more than 225 metres in length, anywhere in the ship’s 
length ; 
(bd) in tankers of more than 150 metres, but not exceeding 225 metres in length. 
anywhere in the ship’s length except involving either after or forward bulkhead 
