Because American standard PN=Class 150ib is the minimum standard, all American standards converted below PN=2.5MPa are PN=Class 150ib, so they cannot be directly converted into American standards.

Extended data

Classification of flanges

1, according to chemical industry standard (HG): integral flange (IF), Threaded flange (th), flat flat welding flange (PL), neck welding flange (WN), neck flat welding flange (SO), socket welding flange (SW), butt welding ring loose sleeve flange (PJ/SE) and flat welding ring loose sleeve. ?

2. According to the industry standard of petrochemical industry (SH), it is divided into threaded flange (PT), welded flange (WN), flat welded flange (SO), socket welded flange (SW), loose sleeve flange (LJ) and flange cover (not shown). ?

3. According to JB industry standards: integral flange, welding flange, flat flat welding flange, loose sleeve flange for butt welding ring plate, loose sleeve flange for flat welding ring plate, loose sleeve flange for flanging ring plate and flange cover. ?

4. According to national (GB) standards: integral flange, threaded flange, welding flange, neck flat welding flange, neck socket welding flange, butt-welded ring neck loose sleeve flange, flat flat welding flange, butt-welded ring plate loose sleeve flange, flat welding ring plate loose sleeve flange, flanging ring plate loose sleeve flange and flange cover.

Flange standard system

There are two main standards for pipeline flanges in the world, namely, the European pipeline flange system represented by DIN in Germany (including the former Soviet Union) and the American pipeline flange system represented by ANSI pipeline flange in the United States. In addition, there are Japanese JIS pipe flanges, but they are generally only used for public works in petrochemical plants and have little international influence. The pipeline flanges in various countries are briefly introduced as follows:

1, pipe flanges of European systems represented by Germany and the former Soviet Union.

2. American system pipe flange standards, represented by ANSI B 16.5 and ANSI B 16.47.

3. British and French pipeline flange standards, each country has two casing flange standards.

To sum up, the international common pipeline flange standards can be summarized as two different and interchangeable pipeline flange systems: the European pipeline flange 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, which is actually a pipeline flange standard combining two series of pipeline flanges in the United States and Germany.

References:

Baidu encyclopedia-flange