Marine Environment Protection and Pollution Prevention
What the exam tests
Marine Environment Protection and Pollution Prevention tests MARPOL controls, oil-spill response, garbage and sewage management, air emissions, ballast water, anti-fouling and ship recycling. The exam expects operational limits, record books and the difference between prevention and response.
Core rules
- MARPOL Annex I regulates oil; Annex IV sewage; Annex V garbage; Annex VI air pollution. Special areas and discharge distances differ by annex, so never transfer a rule from one to another.
- Annex VI: the global sulphur limit is 0.50% m/m; emission control areas generally apply 0.10%. NOx limits depend on engine tier and construction date. EEDI, EEXI and CII address carbon intensity.
- Ballast water management follows the BWM Convention; D-2 is the performance standard. The AFS Convention controls harmful anti-fouling systems. The Hong Kong Convention covers safe and environmentally sound ship recycling.
- Shipboard pollution prevention includes SOPEP, oil record books, garbage record books, segregated ballast, 15 ppm oily-water separators and enclosed drainage controls.
- Spill response follows notification, containment, recovery and disposal; the priority is safety of people before clean-up.
Worked example
A vessel burns 10 tonnes of fuel containing 0.10% sulphur in an ECA. Sulphur mass = 10 × 0.0010 = 0.010 t. When sulphur burns to sulphur dioxide, the mass roughly doubles because oxygen is added: SO2 ≈ 0.020 t. This is a screening calculation; actual emission depends on combustion and sulphur content. To comply, the ship may use compliant fuel, a scrubber approved for the area, or another accepted method.
Traps
Do not apply the 15 ppm oil rule to sewage or garbage. Do not assume a scrubber is automatically acceptable in every port or sea area. Do not confuse D-1 exchange with D-2 treatment. Record-book entries are legal evidence, so omissions are serious.