Stainless steel flange connection method

　　ASME B16.5 Class 150 F304 Forged Stainless Steel Flange connection method: Pipe flanges can be divided into five basic types according to the connection method with the pipe: stainless steel plate flange, stainless steel butt welding flange, stainless steel threaded flange, stainless steel socket welding flange, and stainless steel loose flange.

　　Flange sealing

　　There are many surface types, the commonly used ones are convex surface (RF), concave surface (FM), concave and convex surface (MFM), tongue and groove surface (TG), full plane (FF), and ring connection surface (R).

　　Stainless steel plate flange: suitable for carbon steel pipe connections with nominal pressure not exceeding 2.5MPa. The sealing surface of flat welding flange can be made into three types: smooth type, concave and convex type and tongue and groove type. Smooth flat welding method

　　Stainless steel butt welding flange: used for butt welding of flanges and pipes. It has a reasonable structure, high strength and rigidity, can withstand high temperature and high pressure, repeated bending and temperature fluctuations, and has reliable sealing and nominal pressure.

　　Stainless steel threaded flange of 0.25 ~ 2.5MPa adopts concave and convex sealing surface.

　　Stainless steel socket welding flange: commonly used in pipelines with PN≤10.0MPa and DN≤40.

　　Loose flange: Loose flange is commonly known as loop flange, split welding ring loop flange, flanged loop flange and butt welding loop flange. They are often used where the medium temperature and pressure are not high but the medium is highly corrosive. Condition.

　　When the medium is highly corrosive, the part of the stainless steel flange that contacts the medium (the flanged nipple) is made of corrosion-resistant high-grade materials such as stainless steel, while the outside is clamped by a flange ring made of low-grade materials such as carbon steel. to achieve sealing.

　　Integral flange: The flange is often integrated with equipment, pipes, fittings, valves, etc. This type is commonly used on equipment and valves.