(a) Regarding the geometry of pressure-containing parts, the scope includes the following:
(1) for connections to the vessel, such as external piping, other pressure vessels, and mechanical devices such as pumps, mixers, or compressors
(-a) the welding end connection for the first circumferential joint for welded connections
(-b) the first threaded joint for screwed connections
(-c) the face of the first flange for bolted, flanged connections
(-d) the first sealing surface for proprietary connections or fittings
