Flange connection way

　　Flange connection: pipe flanges and pipe connections can be classified into five basic types: flat welding flange, welded flange, threaded flange, bearing socket weld flange, loose flange. Flange sealing surface has a variety of, generally used with convex (RF), concave (FM), concave convex surface (MFM), tongue and groove surface (TG), flat (FF), ring connection (RJ).

　　Welding steel flanges for carbon steel pipe for the nominal pressure of not more than 2.5MPa connection. Flange sealing surface can be made smooth, bump and tenon slot three. Smooth flat welding flange of the largest amount of applications. It is used in the medium is more relaxed, such as low non clean compressed air, low pressure circulating water and its advantages are relatively cheap price.

　　Butt welded steel flange for the flange and pipe butt welding, reasonable structure, strength and stiffness is larger, can withstand the high temperature high pressure, and repeated bending and temperature fluctuations, sealing reliability, nominal pressure is 0.25 ~ 2.5MPa welded flange with concave and convex type sealing surface.

　　Socket welding flange: commonly used in the PN = 10.0MPa, DN = 40 in the pipeline.

　　Loose set of flange, loose flange commonly known as looper flange, divided into welding ring looper flange, flange loose set of flange and butt looper flange. Commonly used in medium temperature and pressure are not high and medium corrosive strong situation. When the corrosive medium is strong, the flange contact with the medium part (flange short) for high-grade corrosion resistant materials such as stainless steel material, and the external is the use of low grade materials such as carbon steel flange ring clamp it in order to achieve sealing.

　　Integral flange: often the flange and equipment, pipe, pipe fittings, valves and so on, this type of equipment and valves commonly used in the. As the stainless steel market in general is not stable, so the 304 price is also not stable in general 30 yuan / kg, the specific price should be based on the market price.