Blind flanges connection quality requirements

　　The selection of blind flanges must conform to the design requirements. When the design is not required, the proper forms and specifications of blind flanges should be selected according to the highest working pressure of the system, the highest working temperature, the working medium, the material of the blind flange and so on.

　　Before the blind flange is installed, the appearance inspection must be carried out, the surface should be smooth, no defects such as sand, cracks, spots, burrs and other blind flanges can be reduced, and there should be no defects such as perforative scratches on the sealing surface.

　　When blind flange and pipe are assembled,blind flange vertical ruler is used to check the verticality of ASME B16.48 A182 Stainless Steel Spectacle Blind Flange. When the design of parallel deviation dimensions of blind flange connection is not specified, it should not be greater than 1 and 5% of blind flange outer diameter, and not more than 2mm. When two blind flanges are not parallel and exceed the required requirements, it must be withered and no multiple gaskets should be used for correction.

　　When the blind flange is welded to the pipe, the two sides shall be welded according to the standard, and the height of the welding foot shall comply with the regulations.