IMO regulations

New tankers
Transporting refined products, deadweight of 30,000 tonnes or more.		Segregated ballast tanks in defensive position (situated in such a way as to contribute to the protection of cargo tanks in the event of collision or grounding).
Transporting crude oil, deadweight of 20,000 tonnes or more.		Segregated ballast tanks in defensive position, crude oil washing.

Existing tankers
Transporting crude oil, deadweight of 40-70,000 tonnes.		Segregated ballast tanks, crude oil washing or dedicated clean ballast tanks.
Transporting refined products, deadweight of 40,000 tonnes or more.		Segregated ballast tanks or dedicated clean ballast tanks.