International Oil Pollution Prevention Certificate

The International Oil Pollution Prevention Certificate (IOPP) is the statutory certificate that shows a ship complies with MARPOL Annex I on oil pollution prevention. It is issued under Annex I Regulation 7 to every oil tanker of 150 GT and above and every other ship of 400 GT and above on international voyages, after an initial survey, and is valid for up to five years subject to annual and intermediate surveys. The Supplement (Form A for non-tankers, Form B for tankers) lists the ship’s oil-pollution equipment: the oily-water separator, the 15 ppm bilge alarm, sludge tanks, and on tankers the crude oil washing and inert gas arrangements. Port state control checks it first.