1.1.1 In 2003, the Marine Environment Protection
Committee adopted the Revised guidelines and specifications for pollution
prevention equipment for machinery space bilges of ships (resolution MEPC.107(49)). The main purpose
of this revision of the specifications of oil filtering equipment
was to improve their capability of treating emulsified oil.
1.1.2 The present Guidelines have been developed
to provide further assistance for upgrading systems installed on board
ships prior to 1 January 2005, and of which oil filtering equipment
was approved under resolution MEPC.60(33).
1.1.3 It has been recognized that the best measure
to prevent pollution resulting from oily bilge water is installation
of Integrated Bilge Water Treatment System (IBTS) in accordance with MEPC.1/Circ.642 as may be amended. IBTS
prevents generation of oily bilge water. Although it may not be easy
or practicable to fit complete IBTS on existing ships, pre-cleaning
of oily bilge water, e.g., provision of a primary tank between bilge
wells and bilge tank, should be seriously considered in order to remove
impurities in bilge through surfacing or sedimentation, which is an
effective way of preventing clogging of bilge separators.