Flat welding flange characteristics and performance classification

　　Flat welding flanges are tightening flanges and welding flanges. Low pressure small diameters are usually wire contact flanges, high pressure and low pressure large diameters usually use welded flanges, as well as the thickness and number of flanges and diameters vary for different pressures and quantities are different. Depending on the pressure of the pressure, the flange gaskets also have different materials, from low pressure Quadden gaskets, high pressure asbestos gaskets and PTFE gaskets to metal gaskets.

　　The main features of a flat weld flange connection are that it is relatively easy to dismantle, very strong and has excellent sealing properties. When fitting the flange it is necessary that the two flanges are parallel and the sealing surfaces of the flanges must not be damaged but must be cleaned. The gasket used for the flange should be selected according to the design regulations. Flange connection is an important way to connect piping structures. Flanged connections are very convenient and can withstand relatively high pressures.

　　Welded flanges both have protrusions (RF), dimpled surfaces (MFM), ties (TG) and ring joints (RJ).

　　Material: Carbon Steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2CL1/C12, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70.

　　Stained STEL: ASTM A182 F304,304L, F316,316L, 1CR18NI9TI, 0CR18NI9TI 321,18-8;

　　Alloy Steel: ASTM A182F1, F5, F9, F11, F12, F22, F91, A182F12, A182F11,16MNR, CR5MO, 12CR1MO1,15CRMO, 12CR2MO1, A335P22, ST45.8/I;

　　Manufacturing standards: ANSI B16.5, HG20619-1997, GB / T9117.1-2000 - - GB / T9117.4-200, HG20597-1997.

　　Translated with DeepL.com (free version)

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