Mechanical seals for pumps for static test leak installations. After the installation and debugging of mechanical seals for pumps, a static pressure test is generally carried out to observe the leakage. If the leakage is small, it is mostly the moving ring or the static ring, and there is a problem with the sealing ring; when the leakage is large, it means that there is a problem between the friction pair of the dynamic and static rings. On the basis of the preliminary observation of the leakage amount and the judgment of the leakage position, manually rotate and observe. If the leakage does not change significantly, it means that there is a problem with the static and dynamic ring seals; if the leakage changes significantly during rotation, it can be concluded that there is a problem with the friction pair of the dynamic and static rings; if the leaking medium is sprayed along the axial direction, the dynamic ring seal has a problem. most. If the leaking medium splashes around or leaks from the water-cooling hole, the static ring seal is likely to fail. In addition, leakage channels can also exist at the same time, but generally, there are primary and secondary points. As long as you observe carefully and are familiar with the structure, you can make a correct judgment.

Leaks during debugging. After the static test of mechanical seals for pumps, the centrifugal force generated by high-speed rotation during operation will inhibit the leakage of the medium. Therefore, the leakage of mechanical seals for pumps during the test run is basically caused by the damage to the friction pair of the dynamic and static rings after the failure of the shaft and end cover seals. The main factors that cause the failure of the friction pair seal are:

1. During the operation of mechanical seals for pumps, due to abnormal phenomena such as evacuation, cavitation, pressure holding, etc., a large axial force causes the contact surfaces of the dynamic and static rings to separate;

2. When installing mechanical seals for pumps, the compression is too large, causing serious wear and scratches on the end face of the friction pair;

3. The sealing ring of the moving ring is too tight, and the spring cannot adjust the axial floating amount of the moving ring;

4. The static ring sealing ring is too loose. When the moving ring floats axially, the static ring is separated from the static ring seat;

5. There are granular substances in the working medium. During operation, the friction pair is introduced, and the sealing surface of the dynamic and static rings is tested for flaws;

6. The design selection is wrong, the sealing surface is lower than the pressure or the cold shrinkage of the sealing material is large. The above phenomenon often occurs in the trial operation, and sometimes can be eliminated by properly adjusting the static ring seat, but most of them need to be disassembled and replaced.

A sudden leak during normal operation of mechanical seals for pumps. The sudden leakage of centrifugal pumps in operation is caused by normal wear or service life, and most of them are caused by large changes in working conditions or improper operation and maintenance.

1. Evacuation, cavitation, or long-term pressure holding will cause seal damage;

2. The actual output of the pump is too small, a large amount of medium circulates in the pump, and heat accumulates, causing the gasification of the medium and the failure of the seal;

3. The amount of backwater is too large, resulting in sediment at the bottom of the suction pipe side container (tower, kettle, tank, pool), and damage to the seal;

4. Long-term shutdown and restart, no manual rotation, friction pair adhesion, and damage to the sealing surface;

5. Corrosive, polymer, and gelling substances in the medium increase;

6. The ambient temperature changes rapidly;

7. The working conditions are frequently changed or adjusted;

8. Sudden power failure or failure shutdown, etc. Centrifugal pumps leak suddenly during normal operation. If they are not found in time, they will often lead to major accidents or losses. Attention must be paid and effective measures must be taken.

The above is to introduce the reasons for the leakage of mechanical seals for pumps, I hope to help you. Akman Seals, as a manufacturer of mechanical seals for pumps, sells various types of mechanical seals, including mechanical seals for pumps. If you are interested in mechanical seals, you can pay attention to our website.