Flange types or structural types are mainly divided according to the way the flange is connected to the pipe and can be divided into the integral flange, necked threaded flange, butt welding flange, necked flat welding flange, and necked socket Welding flange, plate type flat welding flange, type A butt welding ring plate type loose tube flange, type B butt welding ring plate type loose tube flange, flat welding ring plate type loose tube flange, pipe end flanged plate type loose tube flange (Type A), flanged short plate loose flange (Type B) and flange cover (also called a blind flange), etc.
Integral flanges are mainly used for the flanges at the inlet and outlet of mechanical equipment such as pumps and valves, and are specially used to connect with the flanges on pipes. These inlet and outlet flanges are usually made integrally with the casing of the mechanical equipment as part of the equipment. The flange is usually cast together with the casing of the equipment, and a few are cast (such as the end flange on a forged steel valve).
The threaded flange processes the inner hole of the flange into pipe threads and cooperates with the threaded pipe to achieve connection. It is a non-welded flange. Compared with welded flanges, threaded flanges are easier to install and maintain, and can be used on some pipelines where welding is not allowed on-site. Alloy steel flanges have sufficient strength, but are not easy to weld, or have poor welding performance. Threaded flanges can also be used. However, when the temperature of the pipeline changes rapidly or the temperature is higher than 260°C or lower than -45°C, it is recommended not to use threaded flanges to avoid leakage.
Butt welding flange is also called high-neck flange. There is a long and inclined high neck from the welding point of the flange to the pipe to the flange plate. It gradually transitions to the thickness of the pipe wall along the height direction, which improves the discontinuity of stress and thus increases the Improved flange strength.
Flat welding titanium flange is also called lap welding flange. The connection between the flat welding flange and the pipe is to first insert the pipe into the inner hole of the flange to the appropriate position, and then weld it. The advantage is that it is easier to center during welding assembly and the price is cheap, so it has been widely used.
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