The difference between flat welding flange and butt welding flange:

1. Different forms of welds: flat welding welds can not be X-ray detection, but butt welding welds can; Flat welding is two angular girth welds and butt welding is one butt girth weld.

2, nominal pressure is different: with neck flat welding flange nominal pressure is: 0.6-- 4.0MPa, and with neck butt welding flange nominal pressure is: 1--25MPa grade, obviously, with neck flat welding flange to adapt to the pressure grade is lower.

3. Different connection modes: generally, flat welding flange can only be connected with the pipe, but not directly connected with the butt welding pipe fitting; Butt welded flanges can generally be directly connected to all butt welded pipe fittings (including elbows, tees, reducers, etc.), including pipes, of course.

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