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Home » News » How to Correctly Select Flange

How to Correctly Select Flange

author: Jeawin   time: 2015-01-22 17:10   hits: 7261

Flanges can be chosen according to the following aspects:
(1) The nature of the medium: ordinary medium, special medium, poisonous medium and flammable and explosive medium.

(2) The parameters of the medium, working pressure, working temperature. Under the condition of the medium which is determined, determine PN, which is the nominal pressure of flanges according to the working temperature and working pressure of medium.


At the same time, there are four flange standards of China. They are respectively listed as follows:
(1) National standard of flange GB/T9112 ~ 9124-9124,
(2) Chemical industry standard of flange HG20592 ~ 20635-1997
(3) Machinery industry standard of flange JB/T74-86.2-1994,
(4) Petrochemical industry standard of flange SH3406-1996.

Now, take national standard as example, we explain the selection of flange. National standard flange are divided into two major systems: Europe system of and America system. The flange nominal pressures of Europe system are: PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0, PN6.3, PN10.0 and PN16.0 MPa. The flange nominal pressures of America system are: PN2.0, PN5.0, PN11.0, PN15.0, PN26.0 and PN42.0 MPa.


The basis of choosing flanges
(1) The nature of the transmission medium: ordinary medium, special medium, poisonous medium and flammable and explosive medium.
(2) The parameters of the medium, working pressure, working temperature. Under the condition of the medium that is determined, confirm the nominal pressure of the flange PN according to the temperature and pressure of the medium.
(3) According to the operation place and connection condition, the flange and pipe connection ways and sealing surface forms can be determined.

(4) According to the connection object, the flange specifications can be determined.