Flanges are a common workpiece, and there are several classification methods, some are classified according to chemical industry standards, some are classified according to petrochemical industry standards, some are classified according to machinery industry standards, and some are classified according to national standards. It can be seen that flanges play an important role in various fields.

Because flanges have good comprehensive performance, they are widely used in basic projects such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power, aerospace, shipbuilding, etc. Several common flange applications:

Flat welded steel flange:

Connect to carbon steel pipes whose nominal pressure does not exceed 2.5Mpa. The sealing surface of the flat welding flange can be made into three types: smooth, concave and convex and tongue and groove. Smooth flat-welded flanges are the most widely used. They are mostly used when the medium conditions are relatively mild, such as low-pressure non-purified compressed air and low-pressure circulating water. Its advantage is that the price is relatively cheap.

Butt welding steel flange:

It is used for butt welding of flanges and pipes, with reasonable structure, high strength and rigidity, withstanding high temperature and pressure, repeated bending and temperature fluctuations, and reliable sealing. The butt welding flange with nominal pressure of 0.25-2.5Mpa adopts concave and convex sealing surface.

Socket welding flange:

It is often used in pipelines with PN≤10.0Mpa and DN≤40.

Loose flange:

Loose flanges are commonly called loose flanges, which are divided into weld ring loose flanges, flanged loose flanges and butt welded loose flanges. It is often used when the medium temperature and pressure are not high and the medium is corrosive. When the medium is highly corrosive, the part of the flange contacting the medium (flanging nipple) is made of corrosion-resistant high-grade materials such as stainless steel, and the outside is clamped with a flange ring made of low-grade materials such as carbon steel. To achieve sealing.

Integral flange:

Flanges are often integrated with equipment, pipes, valves, etc. This type is commonly used on equipment and valves.