Gasket sealing in modern industrial enterprises occupies a very important position, the seal is directly related to the production of continuous, property safety, energy saving and environmental protection, as well as people's physical and mental health, so the development of gaskets more and more people's attention. In addition, pressure fluctuations, temperature changes, bolt preload relaxation, flange tilt, misalignment, sealing surface defects, corrosion of the medium will have a great impact on the sealing effect. Therefore, how to correctly select the appropriate sealing gasket according to the working conditions and how to correctly install is to ensure the sealing effect of the key.
Sealing gasket installation requirements
1, the sealing surface of the gasket and the flange should be cleaned, there shall be no impact on the sealing performance of the connection of scratches, spots and other defects exist.
2, the sealing gasket outer diameter should be smaller than the flange sealing surface, the sealing gasket inner diameter should be slightly larger than the inner diameter of the pipeline, the difference between the two inner diameter of the sealing gasket is generally taken as two times the thickness of the gasket to ensure that the pressure, the sealing gasket inner edge does not extend into the container or pipeline, so as not to impede the flow of the container or the pipeline in the fluid.
3, the sealing gasket preload should not exceed the design provisions, so as to avoid excessive compression of the sealing gasket loss of resilience.
4, sealing gasket compression, it is best to use a torque wrench. For large bolts and high strength bolts, it is best to use hydraulic tightener. Tightening torque should be calculated based on the given gasket compression, the size of the hydraulic tightener oil pressure should also be determined by calculation.
5, when installing the sealing gasket, should be in order to tighten the nut. But should not be screwed once to reach the design value. Generally should be at least 2 ~ 3 times, so that the sealing gasket stress distribution is uniform.
6, for flammable, explosive media pressure vessels and pipelines, change the sealing gasket should use safety tools, so as to avoid the tool and flange or bolt touch, produce sparks, resulting in fire or explosion.
7, if the pipeline leakage, must be depressurized to deal with and then replace or adjust the installation of sealing gaskets, is strictly prohibited to operate under pressure.