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 12.
8.3 Oily 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 de-oiled water overboard. The operational merit
of not having to operate the 15 ppm bilge separator frequently should
also be considered. The recommended capacity of oily bilge water holding
tanks should be as follows:
| Main engine rating (kW)
|
capacity (m³)
|
| up to 1,000
|
4
|
| Above 1,000 up to 20,000
|
P/250
|
| Above 20,000
|
40+P/500
|
Where: P = main engine rating in kW.
For ships adopting IBTS, the capacity oily bilge water holding
tanks may be reduced.