Sealing gasket is a kind of sealing spare parts used for machinery, equipment and pipelines as long as there is fluid. It uses internal and external sealing materials. The gasket is made of metal or non-metal plate material, which is made by cutting, stamping or cutting. It is used for the sealing connection between pipes and the sealing connection between the machine parts and the machine parts. According to the material, it can be divided into metal gasket and non-metal gasket. Metal has copper gaskets, stainless steel gaskets, iron gaskets, aluminum gaskets, etc. Non-metallic asbestos gaskets, non-asbestos gaskets, paper gaskets, rubber gaskets, etc.
Gasket installation requirements
1. The sealing gasket and flange sealing surface should be cleaned, and there should be no defects such as scratches and spots that affect the connection sealing performance.
2. The outer diameter of the sealing gasket should be smaller than the outer surface of the flange sealing surface. The inner diameter of the sealing gasket should be slightly larger than the inner diameter of the pipeline. The difference between the two inner diameters is generally 2 times the thickness of the sealing gasket to ensure the sealing gasket after compaction. The inner edge does not protrude into the container or conduit to prevent interference with the flow of fluid in the container or conduit.
3. The pre-tightening force of the gasket should not exceed the design regulations, so as to avoid the excessive compression of the gasket and the rebound ability.
4. When the gasket is pressed, it is best to use a torque wrench. For large bolts and high strength bolts, hydraulic tensioners are preferred. The tightening torque should be calculated according to the compression of a given gasket. The hydraulic pressure of the hydraulic tensioner should also be determined by calculation.
5. When installing the gasket, tighten the nuts in order. However, the design value should not be reached once. Generally, it should be circulated for at least 2~3 times, so that the stress distribution of the gasket is uniform.
6. For pressure vessels and pipelines with flammable and explosive media, safety tools should be used when replacing gaskets to avoid sparks caused by the collision of tools with flanges or bolts, resulting in fire or explosion accidents.
7. If the pipeline leaks, it must be replaced after the pressure reduction treatment or adjust the installation of the gasket. It is strictly forbidden to operate with pressure.