554 



device to provide a contiiiiioiis record of the discharge iii litres 

 per nautical mile and total quantity discharged, or the oil content 

 and rate of discharge. This record shall be identifiable as to time 

 and date and shall be kept for at least three years. The oil dis- 

 charge monitor and control system shall come into operation ^vhen 

 there is any discharge of effluent into the sea and shall be such as 

 will ensure that any discharge of oily mixture is automatically 

 stopped when the instantaneous rate of discharge of oil exceeds 

 that permitted by Eegulation 9(1) (a) of this Aniiex. Any failure 

 of this monitormg and control system shall stop the discharge and 

 be noted in the Oil Eecord Book. A manually operated alternative 

 method shall be provided and may be used in the event of such 

 failure, but the defective unit shall be made operable before the 

 oil tanker commences its next ballast voyage unless it is proceeding 

 to a repair port. Existing oil tankers shall comply with all of the 

 provisions specified above except that the stopping of the dis- 

 charge may be performed manually and the rate of discharge may 

 be estimated from the piunp characteristic. 



(b) Effective oil water interface detectors approved by the 

 Ad min istration shall be provided for a rapid and accurate deter- 

 mination of the oil water interface in slop tanks and shall be 

 available for use in other tanks where the separation of oil and 

 water is effected and from which it is intended to discharge ef- 

 fluent direct to the sea. 



( c) Tustructions as to the operation of the system shall be in 

 accordance with an operational manual approved by the Admin- 

 istration. They shall cover manual as well as automatic operations 

 and shall be intended to ensure that at no time shall oil be dis- 

 charged except in compliance with the conditions specified in 

 Regulation 9 of tliis Annex. [-] 



(4) The recjuirements of paragraphs (1). (2) and (3) of this Regu- 

 lation shall not apply to oil tankers of less than 150 tons gross tonnage, 

 for which the control of discharge of oil under Regulation 9 of this 

 Annex shall be effected by the retention of oil on board with subse- 

 quent discharge of all contaminated washings to reception facilities. 

 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 quan- 

 tity shall be discharged to reception facilities unless adequate arrange- 

 ments are made to ensure that any effluent which is allowed to be 

 discharged into the sea is effectively monitored to ensure that the 

 provisions of Reo:ulation 9 of this Annex are complied with. 



(5) The Administration may waive the requirements of paragraphs 

 (1). (2) and (3) of this Regulation for any oil tanker which engages 

 exclusively on voyages both of 72 hours or less in duration and within 

 50 miles from the nearest land, provided that the oil tanker is not 

 required to hold and does not hold an International Oil Pollution 

 Prevention Certificate (1973). Any such waiver shall be subject to the 

 requirement that the oil tanker shall retain on board all oily mixtures 

 for subsequent discharge to reception facilities and to the determina- 



2 Reference is made to "Clean Seas Guide for Oil Tankers." published by the International 

 Chamber of Shipping and the Oil Companies International Marine Fomm. 



