Installation requirements for gaskets
4, when sealing gasket is pressed, it is better to use torque wrench. For large bolts and high strength bolts, it is better to use hydraulic tightening devices. The tightening torque shall be calculated by calculation according to the given gasket. The size of the hydraulic pressure of the hydraulic tightening device shall also be determined by calculation.5. When installing the gasket, tighten the nut in sequence. However, the design value should not be screwed once. Generally should be recycled at least 2~3 times so that the gasket can be evenly distributed.6, the flammable and explosive medium pressure vessel and piping, replacing gasket should be used to avoid security tools, tool and flange bolts or collide, sparks, causing a fire or explosion accident.7, if there is leakage of the pipeline, it is necessary to reduce the pressure, then replace or adjust the installation of gasket, strictly prohibited with pressure operation.
1, gasket gasket and flange sealing surface should be cleaned, shall not have any influence on the sealing performance of scratches, spots and other defects exist.2, the sealing gasket than the flange sealing surface diameter should be small, the gasket diameter should be slightly larger than the inner diameter of the pipe diameter, two difference 2 times the thickness of the gasket, to ensure that the gasket is compressed, not into the inner edge of a container or a pipe, so as not to impede the flow of liquid container or pipeline flow.3, the gasket preload should not exceed the design requirements, so as to avoid excessive compression gasket, loss of resilience.
1, the installation and the sudden plane flange matching sealing gasket, should pay attention to ensure that the sealing parts and pipes concentric, generally use additional strong ring and bolt internal circumferential contact to locate, not allow eccentric installation. When installing the basic spiral wound gaskets in the close flange of the mortise and tenon surfaces, the gap shall be kept in line with the groove wall.2, installation of the narrow width of the metal gasket, should be a certain thickness of the gasket plate on the outside, and then press the flange, so as to avoid compression filler metal gasket in the metal shell, the interface (or interface) burst damage, metallic gasket.3, when the flange work temperature is higher than 200 degrees, in the flange sealing surface and sealing gasket should be painted with sealant, in order to prevent high temperature sealing gasket and flange sealing surface sintering, to repair and replace the gasket to increase trouble.4, sealing surface is not normal, can be coated with sealant on the sealing surface, and then install the gasket. The sealant generally consists of red lead, manganese dioxide, graphite powder and boiled linseed oil (oil) formed after. According to the sealing medium, working temperature and medium pressure and other conditions, choose the corresponding types and grades of liquid sealant.5, for the installation of octagonal metal ring gasket, when the metal ring gasket and flange sealing groove processing is not ideal, can be achieved through research and close fitting. For large diameter metal ring gaskets, it is difficult to match and grind. In order to fill the tiny surface of metal surface, sealant can be used.
