Failure Analysis Of Sealing Gasket

If the flange, gasket and bolt in the mechanical equipment are regarded as a whole, the flange and bolt are the external covering structure supporting the whole, and the gasket is the connection part of the whole. Therefore, the sealing gasket is the core structure to ensure the mechanical equipment, which directly determines the overall sealing effect of the mechanical equipment.

Causes of seal gasket failure and leakage and solutions:

1. Improper operating parameters of the sealing gasket: when there is a large error in the manufacturing parameters of the sealing gasket of mechanical equipment, the value of the sealing gasket between the flange and the nut will be greatly reduced, resulting in the narrowing of the sealing range of the sealing gasket when the nut rotates, affecting the sealing effect of mechanical equipment;

Solution: 

When the mechanical equipment adjusts the operating size of the sealing gasket, it can be sheared along the outer edge of the flange structure to ensure that the sealing gasket still maintains a good sealing relationship with the external structure of the mechanical equipment after the bolt is fixed. At the same time, during the rotation of the bolt, try to avoid the change of the gasket position with the change of the bolt position, and reduce the displacement of the gasket during the bolt adjustment. In this way, when the gasket is fixed with bolts subsequently, the gasket failure will not occur.

2. Damaged gasket performance: in the environment of oxidation and strong acid corrosion, the metal or non-metal gasket structure will suffer from gasket corrosion or oxidation. If the gasket used in mechanical equipment is a damaged material, the gasket naturally cannot play a role in practical application; The thickness uniformity of the gasket itself is not enough, and the gasket application failure may occur due to the difference in roughness in practical application;

Solution: 

In order to avoid failure in the application of mechanical equipment, the problem can be solved by strengthening the performance protection of the gasket itself; 1. During the actual application of the chemical production unit, try to avoid the sealing gasket in the environment of strong high temperature, low temperature, strong acid and strong alkali; 2. When the sealing gasket is actually used, the gasket with uniform texture and high quality shall be selected as the auxiliary material as far as possible; 3. During the installation of flanges, gaskets and bolts, try to avoid high temperature, strong corrosion and other installation environments, and then carry out the installation of gaskets in sequence under specific conditions;

3. Higher flange stiffness: higher flange stiffness causes the loss of the original function of the sealing gasket in the mechanical equipment, which is caused by the inconformity between the flange structure and the gasket structure in the mechanical equipment;

Solution: 

During the subsequent mechanical equipment treatment, the sealing gasket with moderate flange stiffness and common in actual production shall be the first choice. For example: soft materials such as rubber gasket and graphite gasket;