46 CFR §50.30-1

1. (a)The manufacturer must notify the Officer in Charge, Marine Inspection, of the intended fabrication of pressure vessels that will require Coast Guard inspection.
2. (b)For exemption of certain pressure vessels from shop inspection see § 54.01-15 of this subchapter.
3. (c)For a classification delineation of boilers and pressure vessels refer to tables 1 and 2 to § 54.01-5 of this subchapter.