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1 Subject to the provisions
of paragraph 4 of regulation 3 of this Annex,
oil tankers of 150 gross tonnage and above shall be provided with
slop tank arrangements in accordance with the requirements of paragraphs
2.1 to 2.3 of this regulation. In oil tankers delivered on or before
31 December 1979, as defined in regulation 1.28.1,
any cargo tank may be as a slop tank.
2.1 Adequate
means shall be provided for cleaning the cargo tanks and transferring
the dirty ballast residue and tank washings from the cargo tanks
into a slop tank approved by the Administration.
2.2 In this system arrangements
shall be provided to transfer the oily waste into a slop tank or
combination of slop tanks in such a way that any effluent discharged
into the sea will be such as to comply with the provisions of regulation
34 of this Annex.
2.3 The arrangements of the
slop tank or combination of slop tanks shall have a capacity necessary
to retain the slop generated by tank washings, oil residues and
dirty ballast residues. The total capacity of the slop tank or tanks
shall not be less than 3 per cent of the oil-carrying capacity of
the ship, except that the Administration may accept:
| .1 |
2% for such oil tankers where the tank washing
arrangements are such that once the slop tank or tanks are charged
with washing water, this water is sufficient for tank washing
and, where applicable, for providing the driving fluid for eductors,
without the introduction of additional water into the system; |
| .2 |
2% where segregated ballast tanks or dedicated
clean ballast tanks are provided in accordance with regulation
18 of this Annex, or where a cargo tank
cleaning system using crude oil washing is fitted in accordance
with regulation 33 of this Annex. This
capacity may be further reduced to 1.5% for such oil tankers
where the tank washing arrangements are such that once the slop
tank or tanks are charged with washing water, this water is
sufficient for tank washing and, where applicable, for providing
the driving fluid for eductors, without the introduction of
additional water into the system; and |
| .3 |
1% for combination carriers where oil cargo
is only carried in tanks with smooth walls. This capacity may
be further reduced to 0.8% where the tank washing arrangements
are such that once the slop tank or tanks are charged with washing
water, this water is sufficient for tank washing and, where
applicable, for providing the driving fluid for eductors, without
the introduction of additional water into the system. |
SEE INTERPRETATION 48
2.4 Slop tanks shall be so
designed, particularly in respect of the position of inlets, outlets,
baffles or weirs where fitted, so as to avoid excessive turbulence
and entrainment of oil or emulsion with the water.
3 Oil tankers
of 70,000 tonnes deadweight and above delivered after 31 December
1979, as defined in regulation 1.28.2, shall
be provided with at least two slop tanks.
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