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　　1 installation of static leak test. After the installation and commissioning of mechanical seal, the static test is generally to observe the leakage. If the leakage is small, the number of rings or static ring seals is a problem; the leakage is large, it is showed that the dynamic and static ring friction pairs have problems. Preliminary observation of leakage, the leakage location based on the judge, and then observe the manual barring, if leakage, there was no significant change in static, dynamic ring seal ring in question; such as barring leakage can be concluded that there is obvious change are dynamic and static ring friction pair of problems; such as leakage of the medium along the axial injection, dynamic sealing ring problem exist in the majority of the ring, leakage of the medium to the surrounding injection or leak through the holes in the cooling water, static ring seal failure. In addition, leakage channels can also exist, but generally have primary and secondary differences, as long as the observation is detailed, familiar with the structure, the right to judge.
　　2 leak occurred during commissioning. Pump mechanical seal after static test, the operation of the high-speed rotation of the centrifugal force, will inhibit the leakage of media. Therefore, when the mechanical seal leakage in the test run after the removal of the shaft and the end cover seal failure, basically due to the dynamic and static ring friction pair caused by damage. Causes of friction seal failure are: (L) operation, because of time, cavitation, such as hold pressure anomaly, the axial force caused by the larger, so that dynamic, static ring contact surface separation; (when the installation of mechanical seals excessive compression, resulting in friction face serious wear, abrasion; (3) dynamic tight ring seals, spring can not adjust the dynamic variable amount of axial ring; (4) static seal ring too loose, when the dynamic axial floating ring, static ring from the static ring seat; (5) working media are granular materials, into the functioning of friction, dynamic testing, static seal end; (6) design and selection is not correct, the low pressure end seal or sealing material such as shrinkage of the larger. The phenomenon in the test run often occur, sometimes can be adjusted by the static ring seat, etc., but most of the need to re assemble and replace the seal.