Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.157.162 Crude oil washing during a voyage

(a) Remains empty so that the tank may be inspected upon arrival at the next discharge port;  and

(b) If it is to be used as a ballast tank when leaving the discharge port, is ballasted before the vessel departs from that discharge port so that the tank may be inspected under § 157.140(a)(2).