How to classify flanges?

2019-01-30 14:03:53

The flange is a flanged part. The flanges can be separate, called flanges, or they can be combined, such as flanges at the ends of the valve for easy bolting. This article will introduce the material of the flange, the sealing surface form of the flange and the flange classification according to national standards and chemical, petrochemical and mechanical standards.

Material

20#A105Q235A12Cr1MoV

16MnR15CrMo18-8321

304304L316316L

Sealing surface form

Plane (FF) convex surface (RF) convex surface (M) concave surface (F)

Concave surface (MF) surface (T) groove surface (G) groove surface (TG)

Ring connection surface (RJ)

Divided according to national standards

Overall flange thread flange butt weld flange with neck flat weld flange

Neck socket socket welding flange butt welding ring with neck loose flange plate flat welding flange butt welding ring plate loose flange

Flat welding ring plate loose flange flange flange ring loose flange flange cover

Divided into chemical industry standards

Integral flange (IF) threaded flange (Th) plate flat welding flange (PL) with butt weld flange (WN)

Neck weld flat flange (SO) socket weld flange (SW) butt weld ring loose flange (PJ/SE) flat weld ring loose flange (PJ/RJ)

Lining flange cover (BL(S)) flange cover (BL)

Divided into petrochemical industry standards

Threaded flange (PT) butt weld flange (WN) flat weld flange (SO) socket weld flange (SW)

Loose flange (LJ) flange cover (not shown)

Divided into mechanical industry standards

Integral flange butt welding flange plate flat welding flange butt welding ring plate loose flange

Flat welding ring plate loose flange flange flange ring loose flange flange cover

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