§155.370. Oily mixture (bilge slops)/fuel oil tank ballast water discharges on oceangoing ships of 10,000 gross tons and above and oceangoing ships of 400 gross tons and above that carry ballast water in their fuel oil tanks. — Inbound Citations

(2) Complies with the oily-water separating equipment requirements for oceangoing ships of 400 gross tons and above as set forth in either § 155.360 or § 155.370; or

(b) Where abnormal conditions or the need to carry large quantities of fuel oil render it necessary to carry ballast water that is not a clean ballast in any fuel oil tank, that ballast water must be discharged to reception facilities or into the sea in compliance with part 151 of this chapter using the equipment specified in § 155.370, and an entry shall be made in the Oil Record Book to this effect.

When water ballasting of fuel tanks is necessary, such oily ballast shall not be subsequently discharged overboard within any of the prohibited zones as defined by the Oil Pollution Act, 1961 (33 U.S.C. 1011), except through oily water separators which meet the requirements in 33 CFR 155.330 through 155.380, or directly into sludge barges or shore facilities, or other approved means.