8 Size of oily waste tanks
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC/Circular.235 – Guidelines for Systems for Handling Oily Wastes In Machinery Spaces of Ships – (Adopted on 13 December 1990) - Appendix - Guidelines for Systems for Handling Oily Wastes In Machinery Spaces of Ships - 8 Size of oily waste tanks

8 Size of oily waste tanks

  8.1 Tanks for collection of oily waste from various functions in the engine-room should have adequate capacity, having regard to the intended type of service of the ship. The information given below will provide guidance in this respect, but all other aspects applicable to the specific vessel trading pattern and time in port should additionally be taken into account.

  8.2 The recommended capacity for oil residue (sludge) tanks is specified in the interpretations to regulation 17

  8.3 If an exhausted oil tank is installed, in addition to the requirement under regulation 17, it should be of sufficient capacity to receive lubricating oil or other oils and hydrocarbon-based liquids from engine-room systems being exhausted due to deterioration, contamination or due to maintenance activities. The oil being discharged from the 15 ppm and 100 ppm equipment may also be discharged to this tank. For main and auxiliary engines, which require a complete change of the lubricating oil at sea, the capacity of the tank should be determined

  8.4 If a drain and leakage oil tank is installed, in addition to the requirement under regulation 17 it may be arranged at several locations in the engine-room. The oil being discharged from the 15 ppm and 100 ppm equipment may also be discharged to this tank. The recommended capacity should be as follows:

Main engine rating kW Capacity m3
up to 10,000 20 x D x P/106
above 10,000 D x (0.2 + (7 x (P-10,000)/106)

  • D = days; the same length of the voyage as used in the interpretation to regulation 17.

  • P = main engine rating in kW.

  8.5 Bilge-water holding tanks, if fitted, should have a capacity that provides to the ship the flexibility of operation in ports, coastal waters and special areas, without the need to discharge deoiled water overboard. The operational merit of not having to operate the 15 ppm and 100 ppm equipment frequently should also be considered. The capacity of bilge-water holding tanks should be as follows:

Main engine rating (kW) Capacity m3
Up to 1,000 1.5
Above 1,000 up to 20,000 1.5 + (P-1,000)/1,500
Above 20,000 14.2 + 0.2 (P-20,000)/1,500
   
P = main engine rating in kW
Parent topic: Appendix - Guidelines for Systems for Handling Oily Wastes In Machinery Spaces of Ships
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.