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How to choose a flange

发布时间：

2022-02-27

Flange is also called flange or flange

I.What is a flange

Flange is also called flange or flange

Flanges are the parts that connect pipes to each other and connect them to the pipe ends There are eyelet bolts on the flange to make the two flanges connect tightly Seal between flanges with gasket Flanges are divided into threaded (wire) flanges and welded flanges Flange is a kind of disk-shaped part. In pipeline engineering, flanges are commonly used in pairs In pipeline engineering, flanges are mainly used for pipeline connection Install a flange in all kinds of pipes to be connected. Low-pressure pipes can use wire flanges. Welded flanges with pressure above 4 kg can be used Add a sealing point between the two flanges and fasten them with bolts Flanges with different pressures have different thicknesses and use different bolts When pumps and valves are connected with pipes, the parts of these equipment are also made into corresponding flange shapes, also known as flange connections Connecting parts that are bolted at the periphery of two planes and closed at the same time are generally called "flanges". Such as the connection of ventilation pipes, this kind of parts can be called "flange parts" But this kind of connection is only a part of the equipment, such as the connection between flange and water pump, which is not good. The water pump is called "flange parts" Smaller ones such as valves can be called "flange parts"

II.How to choose flange

At present, there are four flange standards in China:

(1) National Flange Standard GB/T9112 ~ 9124-2000;

(2) Flange standards for chemical industry HG20592 ~ 20635-1997

(3) Flange standard for machinery industry JB/T74 ~ 86.2-1994; (See: Machinery Flange Standard)

(4) Flange Standard SH3406-1996 for Petrochemical Industry. The selection of flange is explained by taking the national standard as an example

The national standard flange is divided into two systems: European system and American system The nominal pressures of European system flanges are: PN 0. 25PN 0. 6PN 1. 0PN 1. 6PN 2. 5PN 4. 0PN 6. 3PN 10. 0 and PN 16. 0MPa; Nominal pressures for flanges in the American system are: PN2.0 PN5. 0PN11. 0PN15. 0PN26. 0 and PN42. 0MPA

2 basis for selecting flange

(1) the nature of conveying medium general medium, special medium, toxic medium, flammable and explosive medium;

(2) The nominal pressure PN of the flange is determined according to the parameters of the medium, the working pressure and the working temperature of the medium when the medium is determined. (2) The nominal pressure PN of the flange is determined according to the working temperature and the working pressure of the medium

(3) Determine the connection mode between flange and pipe and the form of sealing surface according to the connection conditions of using place

(4) Determine the flange specification according to the connection object

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