USCG Exam Practice · MARPOL and discharge regulations
Under 33 CFR §151.13, a vessel of 400 gross tons or more is transiting a MARPOL Annex I special area. Under which condition may processed bilge water from machinery space bilges be discharged within the special area?
- AWhen the vessel is at anchor and the oil content does not exceed 15 ppm
- BWhen the vessel 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 oil content does not exceed 15 ppm and the bilge water originates from cargo pump room bilges
- DWhen the vessel is proceeding en route and the oil content does not exceed 100 ppm
Why B is correct
33 CFR §151.13(d) permits discharge of processed bilge water from machinery space bilges within a special area only when: the bilge water does not originate from cargo pump room bilges, is not mixed with oil cargo residues, the ship is proceeding en route, oil content does not exceed 15 ppm without dilution, approved oily-water separating equipment is in operation, and that equipment has an automatic shutoff device triggered at 15 ppm.
Cited:33 CFR §151.13
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