The rules and regulations in this subchapter are prescribed for all tank vessels in accordance with the intent of the various statutes administered by the Coast Guard and to provide for a correct and uniform administration of the vessel inspection requirements applicable to tank vessels. The regulations in this subchapter (parts 30, 31, 32, 34, 35, 36, 38 and 39) have preemptive effect over state or local regulations in the same fields.
46 C.F.R. §30.01-1