Section 147.1 - Purpose and applicability(a) This part prescribes regulations designating what hazardous materials may be on board vessels as ships' stores and prescribes requirements for the labeling, stowage, and use of those materials.(b) This part applies to all vessels listed in 46 U.S.C. 3301 as subject to inspection under part B of 46 U.S.C. Subtitle II. On foreign vessels in the navigable waters of the United States, the Captain of the Port or District Commander may prohibit the unsafe use or stowage of hazardous ships' stores under 33 CFR 160.109 .(c) All certifications previously issued by the Coast Guard under this part permitting the use of particular materials or products as ships' stores are null and void.(d) The regulations in this subchapter (46 CFR parts 147, 147A, and 148) have preemptive effect over State or local regulations in the same field.CGD 84-044, 53 FR 7749, Mar. 10, 1988, as amended by USCG-2006-24797, 77 FR 33885 , June 7, 2012; USCG-2012-0196, 81 FR 48272 , July 22, 2016