How to connect the flange to the pipe?

How to connect the flange to the pipe?

Pipeline flanges can be divided into five basic types according to their connection with pipes: flat welding flanges, butt welding flanges, threaded flanges (integral flanges), socket welding flanges, and loose flanges.

1. Flat-welded steel flanges: suitable for carbon steel pipe connections with a nominal pressure not exceeding 2.5MPa. The sealing surface of the flat welding flange can be made into three types: smooth, concave-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.

2. Butt-welded steel flanges: 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.

3. Socket welding flange: often used in pipelines with PN≤10.0MPa and DN≤40.

4. Loose flanges: loose flanges are commonly called loose flanges, which are divided into welding 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 low-grade materials such as carbon steel flange rings. To achieve sealing.

5. Integral flange: The flange is often integrated with equipment, pipes, fittings, valves, etc. This type is commonly used on equipment and valves.