Although the installation of metal ring gaskets is not difficult, there are some precautions that need to be understood before installation.
There are seven specific points:
1. The gasket and flange sealing surface should be cleaned evenly, and defects such as scratches and spots that may affect the sealing performance of the connection are prohibited.
2. The outer diameter of the gasket should be smaller than the outer diameter of the flange sealing surface, and the inner diameter of the coin shaped pipeline should be slightly larger. The difference between the two inner diameters should be taken as twice the thickness of the gasket to ensure that the inner edge of the gasket does not protrude into the container or pipeline after compression, and to avoid obstructing the fluid flow in the container or pipeline.
3. The pre tightening force of the gasket should not exceed the design specifications to avoid excessive compression of the gasket and loss of rebound ability.
When tightening the gasket, it is best to use a torque wrench, and for large bolts and high-strength bolts, it is best to use a hydraulic tightener. The tightening torque should be calculated based on the given gasket compression, and the size of the hydraulic tensioner oil pressure should also be calculated.
5. When installing the gasket, it should be tightened in sequence and not all at once to the design value. Generally, it should be cycled at least 2-3 times to ensure even stress distribution of the sealing gasket.
6. When installing gaskets on pressure vessels and pipelines with flammable and explosive media, safety tools should be used to avoid accidents.
7. If there is a leakage in the pipeline, the installation gasket must be replaced or adjusted after pressure reduction treatment. It is strictly prohibited to operate under pressure to avoid danger.
The above are the things to pay attention to before installing the metal ring gasket.