102 
oil tanks for water ballast except as provided for in paragraph (38) of this Reg- 
ulation. In all cases, however, the capacity of segregated ballast tanks shall be at 
least such that in any ballast condition at any part of the voyage, including the 
conditions consisting of lightweight plus segregated ballast only, the ship's 
draugh.s and trim can meet each of the following requirements: 
(a) The moulded draught amidships (dm) in metres (without taking into 
account any ship’s deformation) shall not be less than: dm=2.0+0.02 L. 
(b) The draughts at the forward and after perpendiculars shall correspond to 
those determined by the draught amidships (dm), as specified in sub-paragraph 
(a) of this paragraph, in association with the trim by the stern of not greater 
than 0.015 L, and 
(c) In any case the draught at the after perpendicular shall not be less than 
that which is necessary to obtain full immersion of the propeller(s). 
(3) In no case shall ballast water be carried in oil tanks except in weather 
conditions so severe that, in the opinion of the Master, it is necessary to carry 
additional ballast water in oil tanks for the safety of the ship. Such additional 
ballast water shall be processed and discharged in compliance with Regulation 
9 and in accordance with the requirements of Regulation 15 of this Annex, and 
tat shall be made in the Oil Record Book referred to in Regulation 20 of this 
nnex. 
(4) Any oil tanker which is not required to be provided with segregated bal- 
last tanks in accordance with paragraph (1) of this Regulation may, however, be 
qualified as a segregated ballast tanker, provided that in the case of an oil tanker 
of 150 metres in length and above it fully complies with the requirements of 
paragraphs (2) and (8) of this Regulation and in the case of an oil tanker of 
less than 150 metres in length the segregated ballast conditions shall be to the 
satisfaction of the Administration. 
Regulation 14 
SEGREGATION OF OIL AND WATER BALLAST 
(1) Except as provided in paragraph (2) of this Regulation, in new ships 
of 4,000 tons gross tonnage and above other than oil tankers, and in new oil 
tankers of 150 tons gross tonnage and above, no ballast water shall be carried 
in any oil fuel tank. 
(2) Where abnormal conditions or the need to carry large quantities of oil 
fuel render it necessary to carry ballast water which is not a clean ballast in 
any oil fuel tank, such ballast water shall be discharged to reception favilities 
or into the sea in compliance with Regulation 9 using the equipment specified 
in Reeulation 16(2) of this Annex, and an entry shall be made in the Oil 
Record Book to this effect. 
(3) All other ships shall comply with the requirements of paragraph (1) of 
this Regulation as far as reasonable and practicable. 
Regulation 15 
RETENTION OF OIL ON BOARD 
(1) Subject to the provisions of paragraphs (5) and (8) of this Regulation, oil 
tankers of 150 tons gross tonnage and above shall be provided with arrangements 
in accordance with the requirements of paragraphs (2) and (3) of this Regula- 
tion, provided that in the case of existing tankers the requirements for oil 
discharge monitoring and control systems and slop tank arrangements shall 
apply three years after the date of entry into force of the present Convention. 
(2) (a) Adequate means shall be provided for cleaning the cargo tanks and 
transferring the dirty ballast residue and tank washings from the cargo tanks 
info 2 slop tank approved by the Administration. In existing oil fankers, any 
cargo tank may be designated as a slop tank. 
()) In this system arrangements shall be provided to transfer the oily waste 
into a slop tank or combination of slop tanks in such a way that any effluent 
discharged into the sea will be such as to comply with the provisions of Regula- 
tion 9 of this Annex. 
(c) The arrangements of the slop tank or combination of slop tanks shall have 
a capacity necessary to retain the slops generated by tank washing, oil residues 
and dirty ballast résidues but the total shall be not less than 3 per cent of the 
oil carrying capacity of the ship, except that, where segregated ballast tank~ 
