Different kinds of pipe flanges and their functions

Flat welding flange: it is 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 flange: the most commonly used one. It is butt welded with the pipe. The quality of the welded joint is relatively good, and the neck of the flange uses taper transition, which can withstand more severe conditions;

Socket welding flange: commonly used in pipes with PN ≤ 10.0MPa and DN ≤ 40

Loose flange: it is often used when the medium temperature and pressure are not high and the medium is highly corrosive. When the medium is highly corrosive, the part of the flange in contact with the medium (flanging nipple) is made of corrosion-resistant high-grade materials such as stainless steel, while the outside is clamped by the flange ring of low-grade materials such as carbon steel to achieve sealing

Integral flange: it is often integrated with equipment, pipes, pipe fittings and valves. This type is commonly used in equipment and valves.