wn butt weld joints and PL butt weld joints are the common joints in pipe fitting, and now there is another appearance of collared butt weld joints. Many people can't tell what the difference is between collared butt weld joints and collared butt weld joints. Today I will present their differences.
wn butt weld joints and PL butt weld joints are the commonly used joints in pipe installation, and now there is another appearance of collared butt weld joints. Many people can't tell what the difference is between collared butt weld joints and collared butt weld joints. Today I will present their differences. ① The welding method is different: flat welding cannot be detected by rays, while butt welding can. The welding method of flat neck weld pipe and flange is corner welding, while the welding method of neck butt weld flange and pipe is ring welding; The flat weld is a two-corner joining ring weld, and the butt weld is a mating ring weld. The difference between a flat welding capsule with neck and a flat welding capsule without neck is that the flat welding capsule with neck is one more place on the welding part of the pipe than the one without flat welding capsule with neck, it is that is, the flat capsule, and the boss without capsule is also a flat corner weld. The welding between the collared butt weld flange and the receiving connection belongs to class B seam, and the welding between the collared flat weld flange and the receiving connection belongs to class C seam. testing non-destructive after welding are different.
2) The nominal pressure is different: the nominal pressure of the flat necked weld flange is: 0,6 - 4,0 mpa, while the nominal pressure of the welding flange butt with neck is: 1 - 25 mpa, obviously, the matching pressure level of flat weld flange with neck is lower.
③ The connection method is different: The biggest structural difference between collared butt weld flange and collared butt weld flange lies in the different connection methods between the receiving and the flange. The collared butt weld flange usually receives and connects with the angle of the flange, while the collared butt weld flange is the coupling between the flange and the receiver.
The flat weld neck flange can only be connected with the pipe, not directly with the weld pipe; The butt weld flange generally can be directly connected with all butt weld pipe parts (including elbows, three-way, reducer pipes, etc.), and of course also includes pipes. The rigidity of collared butt welding is greater than the rigidity of collared butt welding, and the strength of butt welding is greater than butt welding, so it is not easy to miss. Neck butt weld flange and collar butt weld flange cannot be replaced casually. In terms of production point of view, the internal length of the collared butt weld flange (SO is the abbreviation of slip on) is large, which means the weight is small and the cost is low. Other butt weld neck flanges with a nominal diameter greater than 250 mm (wn is the abbreviation of Welding neck) should be tested. The SO flange does not need to be tested, so the cost is relatively low. Neck flat weld is an introduced petroleum installation that is used more, similar to the American S0 standard, and neck butt weld flange is used for highly damaged media.
