The Coast Guard waives the requirement for the letter under § 157.116(b) , if a U.S. tank vessel engages in a voyage, or under § 157.118(b)(2)(ii) , if a foreign tank vessel enters the navigable waters of the United States or transfers cargo at a port or place subject to the jurisdiction of the United States, for the purpose of being inspected under § 157.140 .
33 C.F.R. §157.120