Shanghai yousufu stainless steel flange

  Flange connection is a detachable joint in which two pipes, pipe fittings or equipment are fixed on a flange first, then a flange pad is added between the two flanges, and finally the two flanges are tightened with bolts to make them closely combined
Flange connection can generally be divided into five types: flat welding, butt welding, socket welding, loose sleeve and thread

The first four are described in detail below:
1
Flat welding: only the outer layer needs to be welded, and the inner layer does not need to be welded; It is generally used in medium and low pressure pipelines, and the nominal pressure of the pipeline shall be less than 2
5MPa
There are three kinds of sealing surfaces of flat welding flange, namely smooth type, concave convex type and tenon groove type
Among them, smooth type is the most widely used, with affordable price and high cost performance

2
Butt welding: the inner and outer layers of the flange shall be welded, which is generally used in medium and high pressure pipelines
The nominal pressure of the pipeline is between 0
25 ~ 2
5MPa
The sealing surface of butt welding flange connection is concave convex, and the installation is complex, so the labor cost, installation method and auxiliary material cost are relatively high

3
Socket welding: generally used in pipes with nominal pressure less than or equal to 10
0MPa and nominal diameter less than or equal to 40mm

4
Loose sleeve: it is generally used in pipes with low pressure but corrosive medium, so this kind of flange has strong corrosion resistance and is mainly made of stainless steel

This connection is mainly used for the connection of cast iron pipe, non-ferrous metal pipe and flange valve
The connection between process equipment and flange also adopts flange connection

The main features of flange connection are convenient disassembly, high strength and good sealing performance
When installing the flange, the two flanges shall be kept parallel, and the sealing surface of the flange shall not be damaged and shall be cleaned
Flange gasket shall be selected according to design regulations