3.1 “Clean drains” mean internal drains
such as those resulting from the leakage of and condensate from equipment
used for seawater, fresh water, steam, air conditioning, etc., which
are not normally contaminated by oil.
3.2 “Oily drains” mean drains such
as those resulting from the leakage of equipment used for oil and
drains from equipment which under normal circumstances may contain
oil.
3.3 “Oily bilge water” means water
collected in the bilge wells or the tank top such as those resulting
from the unexpected leakage from piping or the maintenance work in
machinery spaces, which may be contaminated by oil.
3.4 “Oil residue (sludge)”: refer
to paragraph 5.2 of the revised Guidelines; includes oily drains.
3.5 “Bilge primary tank” means a pre-treatment
unit for separation of oily bilge water.
3.6 "Clean water holding tank” means tanks
which hold processed water from the oil filtering equipment.