Marine Pollution (Prevention of Pollution from Ships) Act, 1986 (Act No. 2 of 1986)

Schedule

International Convention for the Prevention of Pollution from Ships, 1973

Protocol of 1978

Relating to the International Convention for the Prevention of Pollution from Ships, 1973

Annexes : Regulations

Annex I : Regulations for the Prevention of Pollution by Oil

Chapter III : Requirements for Minimizing Oil Pollution from Oil Tankers due to Side and Bottom Damages

Regulation 24 : Limitation of Size and Arrangements of Cargo Tanks
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(1)Every new oil tanker shall comply with the provision of this Regulation. Every existing oil tanker shall be required, within two years after the date of entry into force of the present Convention, to comply with the provisions of this Regulation if such a tanker falls into either of the following categories:

(a)        a tanker, the delivery of which is after 1 January 1977; or

(b)        a tanker to which both the following conditions apply:

(i)        delivery is not later than 1 January 1977; and

(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 outflow Oc or Os 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 4003, whichever 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 exceed 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 exceeding c in length, may be increased to the maximum limit of hypothetical oil outflow 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 inside the cargo tanks:

 

but not exceed 0.2L

(b)where a centreline longitudinal bulkhead is provided inside the cargo tanks:

 

(c)where two or more longitudinal bulkheads are provided inside the cargo tanks:
(i)for wing tanks: 0.2L
(ii)for centre tanks:
(1)if is equal to or greater than : 0.2L
(2)if is less than :

- where no centreline longitudinal bulkhead is provided:

- where a centreline longitudinal bulkhead is provided:

(d)bi is the minimum distance from the ship's side to the outer longitudinal bulkhead of the tank in question measured inboard at right angles to the centreline at the level corresponding to the assigned summer freeboard.

 

(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 values 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 tc from the ship's side or less than vc 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.