278 



REGULATION 15. — RETENTION OF OIL ON BOABD 



(1 ) Where it is intended that the control of discharge of oil under Regulation 

 11 of this Annex shall he effected by the retention of slops and tank washings on 

 board, oil tankers of [150] tons gross tonnage and above shall be provided with 

 arrangements in accordance with the requirements of this Regulation. 



(2) The sliip sliall be provided with adequate means for cleaning the cargo 

 tanks and with means for the transference of the dirty oil ballast residue and 

 washings from the cargo tanks into a sloj) tank or reception tank approved by 

 the Administration. 



(3) (a) 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 the oil 

 content of any effluent is such as to comply with the provisions of Regulation 9 

 of this Annex. 



(b) The arrangements of the slop tank or combination of slop tanks shall 

 have a capacity necessary to retain the slops generated by the tank washings 

 and dii-ty oil ballast residue but the total shall be not less than [8] per cent 

 of the oil carrying capacity of tlie ship, except that, where arrangements involv- 

 ing the use of additional water, such as eductors, are not fitted the Administra- 

 tion may accept [2] per cent. Oil tanks over [100,000] tons deadweight shall be 

 provided with at least two slop tanks. 



(c) Slop tanks shall be so designed particularly in respect of the position of 

 inlets, outlets, baffles or weirs where fitted, so as to avoid excessive turbulence 

 and entrainment of oil or emulsion with tlie water. 



(d) The tanker shall be fitted with an [automatic] oil content monitoring 

 arrangement " approved by the Administration to check the quality of any 

 effluent discharged to the sea in the "once tlirough system" or decanted from any 

 cargo tank, slop tank or reception tank in which ballast water or tank washings 

 are allowed to settle either when the recirculatory system is used or when the 

 discharge of residue ashore is intended. [The meter shall be fitted with a re- 

 cording device to provide a permanent record of the oil content of the discharge.] 



(e) An efiicient and effective oil/water interface detector approved by the 

 Administration shall be provided for a rapid and accurate determination of the 

 oil/water interface. 



(f) The operation of this system shall be in accordance with an operational 

 manual approved by the Administration and intended to ensure that at no time 

 shall oil be discharged except in compliance with the conditions specified in 

 Regulation 9 of this Annex. 



(4) Where it is intended that the control of discharge of oil under Regulation 

 11 of this Annex shall be effected by the retention of oil on board with sul)sequent 

 discharge to shore of all contaminated washings, the total quantity of oil and 

 water used for washing and returned to a storage tank shall be recorded in the Oil 

 Record Book. This total quantity shall be discharged to the shore unless ade- 

 quate arrangements are made to ensure that any settled water which is allowed 

 to run to the sea is effectively monitored to ensure that the provisions of Regu- 

 lation 9 of this Annex are complied with. 



REGULATION IG. OIL DISCHARGE MONITORING SYSTEM AND OILY WATER SEPARATING 



EQUIPMENT IN SHIPS OTHER THAN OIL TANKERS 



(1) Any ship of [10,000] ^ tons gross tonnage and above shall be fitted with 

 an oil discharge monitoring system to comply with the provisions of paragraph 

 (5) of this Regulation.'' 



(2) Any ship of [400] tons gross tonnage and above shall be fitted with an 

 oily water separating or filtering system complying with the provisions of para- 

 graph (4) of this Regulation. 



(3) The Administration sliall ensure that ships of less than [400] tons gross 

 tonnage are equipped with installations, as far as practicable, in order to retain 

 on board or discharge oil or oily mixture an in accordance with the requirements 

 of Regulaiton 9(1) (b) of this Annex.*" 



(4) An oily water separating system shall be of a design approved by the 

 Administration and shall be such as will ensure that any oily mixture discharged 



''^ Ono dologation suggested that a visual indicator sliould additionally be required. 

 *s Views on the size limitations were widely divided. 



^» Some delefjations expressed doubts on the need to include this paragraph. 

 *" Some delegations pointed out this paragraph would need improvement as the require- 

 ments do not appear fully compatible w-ith Regulation 9(1) (b). 



