Different weld methods: radiographic inspection is not allowed for flat welded welds, but for butt welded welds. The welding method of flat welded flange pipe and flange is fillet weld, while the welding method of butt welded flange and pipe is circumferential weld.
The nominal pressure is different: the nominal pressure of the neck flat welding flange is 0.6 ~ 4.0Mpa, while the nominal pressure of the neck butt welding flange is 1.0 ~ 25MPa. Obviously, the applicable pressure grade of the flat welding flange is lower.
Generally, the flat welding flange with neck can only be connected with the pipe, not directly with the butt welded pipe; Butt welding flanges can generally be directly connected with all butt welding pipe parts (including elbows, tees, reducers, etc.) and, of course, pipes.
Contact Person: Miss. Rachel Zhang
Tel: 13679287344
