46 C.F.R. § 98.30-7 Smoking.
Title 46 - Shipping
No person may smoke within 50 feet of a portable tank on the deck on which the tank is stowed.
Title 46: Shipping
PART 98—SPECIAL CONSTRUCTION, ARRANGEMENT, AND OTHER PROVISIONS FOR CERTAIN DANGEROUS CARGOES IN BULK
Subpart 98.30—Portable Tanks
§ 98.30-7 Smoking.