7 points to note when installing metal gaskets

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  1. The metal sealing gasket and flange sealing surface should be cleaned thoroughly, and there should be no defects such as scratches or spots that affect the sealing performance of the connection.
  2. The outer diameter of the metal sealing gasket should be smaller than the flange sealing surface, and 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 taken as twice the thickness of the sealing gasket to ensure that after compression, the inner edge of the sealing gasket does not protrude into the container or pipeline, so as not to hinder the flow of fluid in the container or pipeline.
  3. The pre tightening force of the metal sealing gasket should not exceed the design specifications to avoid excessive compression and loss of rebound ability of the sealing gasket.
  4. It is best to use a torque wrench when tightening the sealing gasket. For large bolts and high-strength bolts, it is best to use hydraulic tighteners. The tightening torque should be calculated based on the given sealing gasket compression, and the magnitude of the hydraulic tensioner oil pressure should also be determined through calculation.
  5. When installing metal sealing gaskets, the nuts should be tightened in sequence. But it should not be twisted once to reach the design value. Generally, it should be cycled at least 2-3 times to ensure uniform stress distribution of the sealing gasket.
  6. For pressure vessels and pipelines with flammable and explosive media, safety tools should be used when replacing metal sealing gaskets to avoid sparks caused by tool contact with flanges or bolts, which may lead to fire or explosion accidents.
  7. If there is a leak in the pipeline, it must be depressurized before replacing or adjusting the metal sealing gasket. It is strictly prohibited to operate under pressure.

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