46 C.F.R. § 197.336 Pressure piping.
Title 46 - Shipping
Piping systems that are not an integral part of the vessel or facility, carrying fluids under pressures exceeding 15 psig must— (a) Meet the ANSI Code; (b) Have the point of connection to the integral piping system of the vessel or facility clearly marked; and (c) Be tested after every repair, modification, or alteration to the pressure boundaries as set forth in §197.462.
Title 46: Shipping
PART 197—GENERAL PROVISIONS
Subpart B—Commercial Diving Operations
equipment
§ 197.336 Pressure piping.

