ANSI B16.5 and ANSI B 16.47 with neck flange

Neck flange is a proper term, divided into neck flat welded flange and neck butt welded flange. The international standard for pipe flanges can be summarized as two different and non-interchangeable pipe flanges systems.

There are two main international pipe flange standards, namely, the European pipe flange system represented by the German DIN (including the former Soviet Union) and the American pipe flange system represented by the American ANSI pipe flange. In addition, there are Japanese JIS pipe flanges, but they are generally only used for public works in petrochemical installations, and have less impact internationally. The pipe flanges of various countries are introduced below:

1, the European system pipe flange represented by Germany and the former Soviet Union

2, the American system pipe flange standard, represented by ANSI B16.5 and ANSI B 16.47

3, British and French pipe flange standards, the two countries each have two casing flange standards.

To sum up, the international standard of pipe flanges can be summarized as two different, and not interchangeable pipe flanges system: a European pipe flanges system represented by Germany; The other is the American pipe flange system represented by the United States.

IOS7005-1 is a standard issued by the International Organization for Standardization in 1992, the standard is actually the United States and Germany two series of pipe flanges merged into the pipe flanges standard.

1, according to the chemical industry standard (HG) : integral flange (IF), threaded flange (Th), plate flat welded flange (PL), neck flange, socket welded flange (SW), butt welded ring loose sleeve flange (PJ/SE), flat welded ring loose sleeve flange (PJ/RJ), lining flange cover (BL (S)), flange cover (BL).

2, according to petrochemical (SH) industry standards: threaded flange (PT), butt welded flange (WN), flat welded flange (SO), socket welded flange (SW), loose sleeve flange (LJ), flange cover (not note).

3, according to mechanical (JB) industry standards: whole flange, butt welded flange, plate flat welded flange, butt welded ring plate loose sleeve flange, flat welded ring plate loose sleeve flange, flanging ring plate loose sleeve flange, flange cover.

4, according to the national (GB) standard: whole flange, threaded flange, butt welded flange, neck flange, plate flat welded flange, butt welded ring plate loose sleeve flange, flat welded ring plate loose sleeve flange, flanging ring plate loose sleeve flange, flange cover.