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Flange Connection Method and Characteristics

May. 11, 2020

The flange plate (disc) is the part that connects the pipe to the pipe. Connect to the end of the pipe. Generally, there are holes in the flange. Bolts can be inserted to make the two flanges tightly connected. Gasket seals between flanges.

Flanged fittings refer to fittings with flanges (protruding edges or joints). It may be cast (temporarily missing), threaded or welded. The flange connection consists of a pair of flanges, a gasket, and several bolts and nuts. The gasket is placed between the sealing surface of two flanges. After tightening the nut, the specific pressure on the gasket surface reaches a certain value and produces deformation. The gasket fills the uneven part of the sealing surface to make the connection tight and leakproof.

Flange connection is a detachable connection. According to the connected parts can be divided into a container flange and pipe flange. According to the structure type, there are integral flange, looper flange, and threaded flange. The common integral flange has a flat welding flange and butt welding flange. Flat welding flange is less rigid, suitable for pressure p≤4MPa occasions; Butt welding flange also known as high neck flange, the rigidity is larger, suitable for higher pressure and temperature occasions.

There are three types of flange sealing surface: flat sealing surface, suitable for low pressure, medium non-toxic occasions; Concave-convex sealing surface, suitable for slightly higher pressure occasions; Tenon sealing surface, suitable for inflammable, explosive, toxic media and high-pressure occasions. The gasket is a kind of plastic deformation and a certain strength of the material made of a ring. Most of the gasket is cut from the non-metallic board, or by the professional factory according to the specified size of production, its material for asbestos rubber board, asbestos board, polyethylene board; Also useful for thin metal plate (tin, stainless steel) asbestos and other non-metallic materials wrapped up made of a metal gasket; There is also a winding gasket made of thin steel tape and asbestos tape. The ordinary rubber gasket is suitable for the occasions where the temperature is lower than 120℃; Asbestos rubber gasket is suitable for water vapor temperature less than 450℃, oil temperature less than 350℃, pressure less than 5MPa occasions, for the general corrosive medium, the most commonly used is the acid-resistant asbestos board. In high-pressure equipment and pipelines, the use of copper, aluminum, no. 10 steel, stainless steel made of the lens, or other shapes of metal gaskets. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the processing finish of the sealing surface and the gasket is relatively high.

 Carbon Steel Forged Flange

 Carbon Steel Forged Flange

Carbon steel flange china has strong applicability, which can be used in different fields. The carbon steel flange produced by this method is also applicable to the insulated carbon steel flange used in long-distance pipelines with pressure PN ≥ 2.5mpa in oil and gas fields and stations. Simply change the carbon steel flange to the corresponding grade of special carbon steel flange can be used in exactly the same way.

Carbon steel forged flange can be used in different places and countries, and play different roles and values in different fields. It can help users to play an important role and value. Carbon steel flange in use has a certain working principle, the use of carbon steel flange in the insulation gasket and high strength insulation sleeve pad electrical insulation performance, the carbon steel flange on both sides of the electrical insulation work. The test results show that the resistance values of insulation gaskets and bolt-fastening insulation bushing pads on the insulation working surfaces can meet the requirements of the specification. Carbon steel flange has good value and function in use and can play an important role and value in different industries and fields.