46 C.F.R. § 13.109

(a) Each tank vessel endorsement described in § 13.107 will expressly limit the holder's service under it to transfers involving one or both of the following cargo classifications:

(1) Dangerous liquid (DL).

(2) Liquefied gas (LG).

(b) No tank vessel endorsement is necessary to transfer the liquid cargoes in bulk listed in table 2 of part 153 of this subchapter when those cargoes are carried on barges not certified for ocean service.