1 Except as provided
in paragraph 7 below:
-
.1 every oil tanker of 150 gross tonnage and above
delivered after 31 December 1979, as defined in regulation 1.28.2, and
-
.2 every oil tanker of 150 gross tonnage and above
delivered on or before 31 December 1979, as defined in regulation 1.28.1, which falls
into either of the following categories :
-
.2.1 a tanker, the delivery of which is after
1 January 1977, or
-
.2.2 a tanker to which both the following conditions
apply:
-
.2.2.1 delivery is not later than 1 January 1977;
and
-
.2.2.2 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
shall comply with the provisions of this regulation.
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
25 of this Annex anywhere in the length of the ship does not
exceed 30,000 cubic metres or , 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 75 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
18 of this Annex, the permitted volume of a wing cargo oil
tank situated between two segregated ballast tanks, each exceeding l
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 m or one of the following values, whichever
is the greater:
-
.1 where no longitudinal bulkhead is provided
inside the cargo tanks:
but not to exceed 0.2L
-
.2 where a centreline longitudinal bulkhead is
provided inside the cargo tanks:
-
.3 where two or more longitudinal bulkheads are
provided inside the cargo tanks:
b
i 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 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 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.
7 This
regulation does not apply to oil tankers delivered on or after 1 January
2010, as defined in regulation
1.28.8.