MARPOL Annex I is the section of the MARPOL Convention specifically governing the prevention of oil pollution from ships — one of the most heavily enforced and heavily inspected annexes given oil pollution’s severe environmental impact.
Core Requirements
- Oil Record Book — mandatory log of every oil transfer, bilge discharge, and related operation, a document Port State Control inspectors scrutinize closely, since falsified entries are a serious, career-ending violation
- Oily Water Separator (OWS) — required equipment treating bilge water to below the permitted oil content (15 ppm) before any discharge, with continuous monitoring
- Special Areas — designated zones (Mediterranean, Baltic, Red Sea, and others) where oil discharge is completely prohibited, regardless of treatment level
- Segregated Ballast Tanks — required on larger tankers, keeping ballast water entirely separate from cargo oil tanks to prevent oil contamination during ballasting
Why This Is Heavily Enforced
Oil Record Book falsification has been the specific basis for serious criminal prosecutions of ship operators and officers in multiple countries — this isn’t a theoretical risk. PSC inspectors specifically cross-check OWS operating logs against Oil Record Book entries and bunker/consumption records looking for inconsistencies.
Exam Relevance
MARPOL Annex I requirements — Oil Record Book, OWS operation, and Special Area restrictions — are core, heavily-tested topics across deck and engineering officer competency exams.