Introduction of structural characteristics and Application of butt Welding Flange

- Jan 07, 2019-

In pipeline engineering, flange is mainly used for connection of pipeline, low pressure pipe can use wire flange, welding flange should be used for more than 4 kg pressure.       

Butt welding flanges are mostly used in medium conditions, such as low pressure unpurified compressed air, low pressure circulating water, its advantage lies in the cheaper price. The sealing face of butt welding flange can be divided into three types: smooth type, concavity type and tenon groove type. Smooth butt welding flange is widely used, and other two kinds of butt welding flange are more in use. The butt welding flange has reasonable structure, high strength and rigidity, and can withstand all kinds of bad environments such as high temperature and high pressure, repeated bending and temperature fluctuation, and can not reduce thesealing performance.

      Butt welding flange is a kind of pipe fittings. It refers to a flange with neck and circular pipe transition and welded to pipe. At present it is widely used because butt welding flange is not easily deformed, sealed well, widely used, has the corresponding rigidity and elasticity requirement and reasonable butt welding thinning transition.

      At the same time, because of the large distance between the welding joint and the joint, the joint can avoid the deformation of welding temperature, and it adopts a more complex bullhorn structure, which is suitable for pipelines with large fluctuations in pressure or temperature, or pipelines with high temperature, high pressure and low temperature. Generally used for the connection of pipes and valves with PN greater than 2.5MPa; Also used to transport expensive, flammable, explosive media pipeline. In the production process, the technical parameters of butt welding flange are strictly controlled in production and welding to ensure that it can play a full role and value in production and use.

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Butt welding flange is a flange with neck and circular pipe transition and connected with pipe butt welding. It is not easy to deform, seal well, is widely used, has the corresponding rigid and elastic requirements and reasonable butt welding thinning transition. The relevant data of butt welding flange are as follows:

(1) the diameter of the center circle of the bolt hole of the butt welding flange is 50mm-2130mm.

(2) Bolt hole diameter of butt welding flange is 11mm-30mm

(3) thickness of butt welding flange: 12mm-58mm

(4): A (17. 2-2032MM) B (14-2020MM)

(5) flange bore: A (18-2036MM) B (15-2024MM)

(6) theoretical weight of flange: 0.36kg--234.6kg (DN1800)

       Butt welding flanges are especially suitable for pipelines with large fluctuations in pressure or temperature, high pressure and low temperature. They are generally used to connect pipes and valves whose PN is greater than 2.5MPa, and also to transport expensive, flammable and explosive media.

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