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How To Choose The Right Gasket

Apr 10, 2020

      Gasket seals are the most important type of static seals for detachable joints in pressure vessels, processing equipment, power machines and connecting pipes. 

       With the large-scale production equipment, the production process is developing toward high temperature, high pressure and high speed. There are more and more opportunities for leakage, and the probability of accidents is increasing, and the economic losses are also increasing. Often, the leakage of a flange may cause a set of equipment and even the whole plant to stop production. It is also likely to cause fire, explosion, serious accidents such as casualties, environmental pollution, product loss or even accidents. The importance of gasket sealing is self-evident. Therefore, the problems in the selection, design and manufacture of gaskets have gradually attracted people's attention.

So, how should we choose the right gasket?

Gasket and gasket seal

       A gasket is a combination of materials or materials that are held between two separate connectors (mainly flanges) that maintain a seal between the two connectors for a predetermined period of service. 

The gasket must be able to seal the joint surface and ensure that the sealing medium is impermeable and is not corroded and can withstand the effects of temperature and pressure. Gasket seals generally consist of connectors (such as flanges), gaskets and fasteners (such as bolts and nuts) .Therefore, when determining the sealing performance of a flange, the entire flange connection structure must be considered as a system. Whether the gasket works normally or fails depends on the performance of the gasket itself, but also on the stiffness and deformation of the system, the roughness and parallelism of the joint surface, as well as the size and uniformity of the tightening load. 

How to choose the right gasket for design process engineers reference

Five aspects of gasket selection

         Knowing the structure of the gasket seal, we can choose a suitable gasket from five aspects: temperature, application, medium, pressure and size (TAMPS).

The gaskets selected should have a reasonable service life at the highest or lowest operating temperatures, and the maximum operating temperatures of the different gasket materials vary widely.

         In addition to the maximum and minimum operating temperatures that can be tolerated in the short term, the continuous operating temperature allowed is also considered. The gasket material should be resistant to creep to reduce the stress relaxation of the gasket, so as to ensure the gasket sealing under working conditions. The creep relaxation of most gasket materials become more severe as the temperature increases. Therefore, an important indicator of the quality of the gasket is the creep relaxation performance of the gasket at a certain temperature.