The high-pressure flange is mainly used in the installation of the pipeline, for the pressure that is higher than 10MPa pipe or equipment connection flange, high-pressure flange connection is an important connection mode of pipeline construction, mainly connecting pipe to pipe connection, and plays an important role and value. A high-pressure flange connection is the two pipes, pipe fittings, or equipment, respectively fixed on a flange plate, between the two flanges, plus a flange pad, bolted together to complete the connection. Some pipe fittings and equipment have their own flange, which is also a flange connection, mainly including traditional high-pressure flange and high-pressure self-tightening flange.

High pressure flange  features 1, high-pressure flange using bolts connection; 2, its sealing principle for plastic deformation to achieve sealing effect; 3. The high-pressure flange is generally larger in volume, so the larger weight is relatively difficult to install and locate; 4, high-pressure flange bolts to withstand tension, temperature difference stress and bear bending moment, torque, and so on many external forces; 5. Traditional high-pressure flange products have strict requirements on temperature, pressure, and medium, so their sealing performance is relatively unstable and easy to leak problems.

High-pressure flange product performance: corrosion resistance and high-temperature resistance

Common materials of high-pressure flange:

Carbon Steel: Carbon Steel: ASTM A105, 20 #, Q235, 16 mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, the F60, F65, F70

Stainless Steel: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;

Alloy Steel: ASTM A182F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo,

Imported material: [1] (nickel steel), WC5 (1.25% 0.5% chrome molybdenum steel), WC9 chromium (2.25%), C5 (% 5% chromium molybdenum), C12 (9% 1% chromium molybdenum), CA6NM (4 (12% chromium steel), CA15 (4) (12% chromium), CF8M stainless steel (316), CF8C stainless steel (347), CF8 (3 04 Stainless steel), CF3(304L stainless steel), CF3M(316L stainless steel), CN7M(alloy steel), M35-1(Monel), N7M(Haster nickel alloy B), CW6M(Haster nickel alloy C), CY40(Inco nickel alloy)

High-pressure flange standard: Ministry of Power standard GD0506-0507 Flange and tube plate for pressure vessels: National standard JB/T4700~4707-2000 (GB/T9112-2000) Standard of Ministry of Machinery (JB81-59, JB/T74-94) Standard of Ministry of Petrochemical (SH3406-96) Standard of Ministry of Chemical Industry (HG5010-58, HG20592-97) such as ANSI B16.5, JIS 2220, and DIN, Germany

High-pressure flange in use has a good role and value, the premise is to be in accordance with the corresponding method to use, in the installation of the first according to the guidance of experts reasonable installation, in order to better ensure the use of value, better prolong the service life. Secondly, during the installation, the gasket shall not be replaced with the ordinary gasket, and the corresponding gasket must be selected to ensure the best sealing effect.

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