In addition to salt water pump mechanical seal failure cause of downtime analysis

In addition to salt water pump downtime is mainly caused by the failure of mechanical seal. Failure of performance are mostly leakage, leakage reason has the following kinds:

(1) of dynamic and static ring sealing surface leakage, the reason mainly has: face flatness and roughness do not meet the requirements, or surface scratch; End face between particulate matter, two end can't also run; Installation does not reach the designated position, the way is not correct.

(2) the compensation loop seal leak, the reason mainly has: gland deformation, uneven prestressing force; Installation is not correct; Sealing ring is not in conformity with the quality standards; Seal type selection is not correct.

actual use effect shows that the sealing component failure activity is most part of the end of the loop, the centrifugal pump of dynamic and static ring sealing face appear crack is a common failure phenomenon, main reasons are:

1. When installation, sealing surface gap is too big, rinses doesn't take away the heat generated by the friction pair; Flushing fluid leakage from the seal face clearance, face overheating and damage.

(2) the liquid medium vaporizing expansion, make the two end separately by vaporizing expansion force, when the two seal face hard joint lubrication membrane causing end surface is overheating.

3. Liquid medium lubricity is poorer, combined with the operating pressure overload, two seal face tracking rotation are not synchronized. Such as high speed pump rotating speed of 20445 r/min, sealing surface center 7 cm in diameter, pump running after the linear speed up to 75 m/s, when there is a lag cannot track rotating on sealing surface, instantaneous heat sealing surface damage.

(4) seal rinses orifice or filter blockage, cause water shortage, make the machine seal failure.

in addition, the sealing surface on the surface of sliding groove, there was a gap joint seal component failure, the main reasons are:

1) liquid medium is not clean, there are small qualitative hard particles, with a high speed sliding sealing surface, will end surface scratch and failure.

2. Poor pump drive a coaxial degree, water pump open after every turn end was shaking frictional once a week, different heart ring orbit, cause end surface vaporization, overheating of wear and tear.

3. Liquid medium hydraulic characteristics of frequent cause vibration pump group, sealing surface dislocation caused failure. Liquid medium corrosion of seal element, stress concentration, hard and soft materials, erosion, auxiliary seal ring 0, v-shaped ring, concave ring and liquid medium are incompatible, the surface damage of the mechanical seal failure deformation, etc, so the damage form to comprehensive analysis, find out the root cause, to guarantee the mechanical seal long running

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