§ 197.336 - Pressure piping.
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.