USCG Exam Practice · MARPOL and discharge regulations
Under 33 CFR §151.13, a ship of 400 gross tons or over is transiting a MARPOL Annex I special area. Under which condition may processed bilge water from machinery space bilges be discharged within that special area?
- AWhen the ship is at anchor and the oil content does not exceed 15 ppm
- BWhen the ship is proceeding en route, the oil content does not exceed 15 ppm, and approved oily-water separating equipment with an automatic shutoff is in operation✓ correct
- CWhen the bilge water originates from cargo pump room bilges and is processed through approved equipment
- DWhen the ship has segregated ballast tanks and the oil content does not exceed 100 ppm
Why B is correct
33 CFR §151.13(d) provides a specific exception to the special area prohibition for processed bilge water from machinery space bilges, requiring among other conditions that the ship be proceeding en route, the oil content not exceed 15 ppm, and that approved oily-water separating equipment equipped with an automatic shutoff device be in operation. Bilge water originating from cargo pump room bilges is explicitly excluded from this exception.
Cited:33 CFR §151.13
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