95 
(17) “Segregated ballast” means the ballast water introduced into a tank 
which is completely separated from the cargo oil and oil fuel system and which 
is permanently allocated to the carriage of ballast or to the carriage of ballast 
or cargoes other than oil or noxious substances as variously defined in the 
Annexes of the present Convention. 
(18) “Length” (J.) means 96 per cent of the total length on a waterline at 
85 per cent of the least moulded depth measured from the top of the keel, or the 
length from the fore side of the stem to the axis of the rudder stock on that 
waterline, if that be greater. In ships designed with a rake of keel the waterline 
on which this length is measured shall be parallel to the designed waterline. The 
length (1) shall be measured in metres. 
(19) “Korward and after perpendiculars” shall be taken at the forward and 
after ends of the length (I.). The forward perpendicular shall coincide with the 
foreside of the stem on the waterline on which the length is measured. 
(20) “Amidships” is at the middle of the length (1). 
(21) “Breadth” (13) means the maximum breadth of the ship, measured amid- 
ships to the moulded line of the frame in a ship with a metal shell and to the 
outer surface of the hull in a ship with a shell of any other material. The breadth 
(B) shall be measured in metres. 
(22) “Deadweight” (DW) means the difference in metric tons between the dis- 
placement of a ship in water of a specitic gravity of 1.025 at the load water line 
corresponding to the assigned summer freeboard and the lightweight of the 
ship. 
(23) “Lightweight” means the displacement of a ship in metric tons without 
cargo, oil fuel, lubricating oil, ballast water, fresh water and feedwater in tanks, 
consumable stores, passengers and their effects. 
(24) “Permeability” of a space means the ratio of the volume within that 
space which is assumed to be occupied by water to the total volume of that space. 
(25) “Volumes” and “areas” in a ship shall be calculated in all cases to 
moulded lines. 
Regulation 2 
APPLICATION 
(1) Unless expressly provided otherwise, the provisions of this Annex shall 
apply to all ships. 
(2) In ships other than oil tankers fitted with cargo spaces which are con- 
structed and utilized to carry oil in bulk of an aggregate capacity of 200 cubic 
metres or more, the requirements of Regulations 9, 10, 14, 15(1), (2) and (3), 
18, 20 and 24(4) of this Annex for oil tankers shall also apply to the construc- 
tion and operation of those spaces, except that where such aggregate capacity 
is less than 1,000 cubic metres the requirements of Regulation 15(4) of this 
Annex may apply in lieu of Regulation 15(1), (2) and (8). 
(8) Where a cargo subject to the provisions of Annex II of the present Con- 
vention is carried in a cargo space of an oil tanker, the appropriate requirements 
of Annex II of the present Convention shall also apply. 
(4) (a) Any hydrofoil, air-cushion vehicle and other new type of vessel (near 
surface craft, submarine craft, etc.) whose constructional features are such as 
to render the application of any of the provisions of Chapters II and III of this 
Annex relating to construction and equipment unreasonable or impracticable 
may be exempted by the Administration from such provisions, provided that the 
construction and equipment of that ship provides equivalent protection against 
pollution by oil, having regard to the service for which it is intended. . 
(b) Particulars of any such exemption granted by the Administration shall 
be indicated in the Certificate referred to in Regulation 5 of this Annex. 
(c) The Administration which allows any such exemption shall, as soon 
as possible, but not more than ninety days thereafter, communicate to the Orga- 
nization particulars of same and the reasons therefor, which the Organization 
shall circulate to the Parties to the Convention for their information and appro- 
priate action, if any. 
Regulation 3 
EQUIVALENTS 
(1) The Administration may allow any fitting, material, appliance or appara- 
tus to be fitted in a ship as an alternative to that required by this Annex if such 
