5.7 Oil Pollution Prevention Measures
5.7.1 General
For vessels of 400 gross tons and above means are to be provided to process oil contaminated water from machinery space bilges prior to discharging it overboard. In general, the discharge criteria of MARPOL ANNEX 1, Regulation 15 are to be complied with.
5.7.2 Oily Water Filtering or Separating Equipment
Oily water filtering equipment capable of processing oily mixtures to produce an effluent with oil content not exceeding 15 parts per millions (PPM) and complying with IMO Resolution MEPC.107(49) is to be provided to allow oily water from the bilges to be processed prior to discharging overboard. For vessels of 10,000 tons gross tonnage and above, the equipment is to be fitted with an alarm and an arrangement to automatically stop the discharge when 15 PPM cannot be maintained.
5.7.3 Sludge Tank (1 July 2012)
A tank or tanks of adequate capacity is to be provided to receive oily residues such as those resulting from the oily water filtering or separating equipment and from the purification of fuel and lubricating oils. The minimum sludge tank capacity V1 is to be calculated by the following formula: