Symptoms Sealed pronunciation or gassing (intermittent shaking). The static ring is bitten and eroded, resulting in a comet-like texture process that causes the outer edge of the narrow ring to be trimmed. Corrective measures Use wear-resistant materials as the end surface; improve the circulation conditions: hydrocyclone, external clean flushing; end surface deformation Symptoms When the pump is started, the seal leaks and the amount of leakage changes over time.

Corrective measures Natural aging deformation, re-grind; improper assembly, re-assemble carefully; poor alignment of the pump and bearing damage, adjust the pump. Coking High-temperature hydrocarbons often experience coking failures. The hard ring is thermally cracked.Common causes of seal failures in general mechanical seal analysis are usually obtained through analysis of the process experienced in use. Gently grind the end face on the platform, showing signs of deformation. The sealing life is short.

Dry operation There is insufficient or no liquid between the end faces. Vaporization (flashing) When the friction heat of the sealing surface accumulates, the liquid film between the end surfaces will locally boil. When the pump is stopped, the liquid viscosity increases due to the drop in temperature, which causes problems in restarting the pump. a. The rubber ring is hardened. Graphite ring powder accumulates on the outside of the Gland. Symptoms: Carbon graphite particles come off the end surface; the hard ring has polishing marks; graphite particles remain in the small gaps.

There is graphite dust accumulation at the inner edge of the end face. Corrective measures Check seal design parameters; improve circulation conditions. Symptoms Solid particles remain or accumulate on end faces and small gaps. Seal leakage and gel freezing. The graphite ring has record grooves. c. Corrective measures Choose balanced seals; choose hard materials with high thermal conductivity; check exhaust conditions; improve circulation conditions. Stable dripping on the sealing surface.

Abrasive wear The medium contains abrasive solid particles. Symptoms The stationary ring has severe wear and grooves. f. Pump and (or) shaft vibration.There are traces of polishing on the surface of the hard ring, or radial cracks (hot cracks) and discoloration. Seal screams while working.

Gas shock (spatter and splash) during sealing work. g. When the leakage of the liquid film is small, the air side of the seal will have a tendency to coke, which will prevent the end face from following and cause end face wear. Blister The shear stress between the ends of the high-viscosity liquid exceeds the breaking strength of graphite. Corrective measures Check the circulation; use 15~30min PTFE coated fiberglass fabric steam preheating or ※low pressure steam insulation

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