What is flange installation?

Flange installation is flange connection, that is, two pipes, pipe fittings or equipment are fixed on one flange respectively, then a flange gasket is added between the two flanges, and finally the two flanges are tightened with bolts to make them closely combined.

The main characteristics of flange connection are convenient disassembly, high strength and good sealing performance. When installing flanges, the two flanges should be kept parallel, and the sealing surfaces of the flanges should not be bruised and cleaned. Flange gasket should be selected according to the design regulations.

Generally, threaded connecting flanges are used for low pressure and small diameter, and welded flanges are used for high pressure and low pressure and large diameter. Under different pressures, the thickness of flange and the diameter and number of connecting bolts are different.

Extended data

Generally speaking, flange connection methods can be divided into five types: flat welding, butt welding, socket welding, loose sleeve and thread.

1, flat welding: only the outer layer needs to be welded, and the inner layer does not need to be welded; Generally used for medium and low pressure pipelines, the nominal pressure of the pipeline should be lower than 0.25MPa.

2. Butt welding: both the inner and outer layers of the flange should be welded, which is generally used for medium and high pressure pipelines, and the nominal pressure of the pipeline is between 0.25 MPa and 2.5 MPa.

3. Socket welding: generally used for pipes with nominal pressure less than or equal to 10.0MPa and nominal diameter less than or equal to 40 mm. ..

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

Baidu encyclopedia-flange connection