Analysis of the factors of gear oil pump mechanical seal failure-

Analysis on the Factors of the Failure of the Mechanical Seal of the Gear Oil Pump

　2016-11-21　　

　　 1. Mechanical seal failure of gear oil pump due to corrosion:

　　①, the sealing surface is pitted and even penetrated.

　　②, because the tungsten carbide ring is welded to the stainless steel seat, the stainless steel seat is prone to intergranular corrosion during use;

　　③, welded metal bellows, tension springs, etc. are prone to cracks under the action of stress and corrosion of the medium.

　　 2. Mechanical seal failure due to high temperature effect:

　　①. Thermal cracking is the most common failure phenomenon of gear oil pumps, such as residual oil pumps, refining pumps, and atmospheric and vacuum tower bottom pumps. Because of dry conflict at the sealing surface, the cooling water suddenly continues and impurities enter the sealing surface. Evacuation and other conditions will cause radial cracks on the ring surface;

　　②. Graphite carbonization is one of the primary factors for seal failure when using carbon-graphite rings. Because in use, it is assumed that once the graphite ring crosses the allowable temperature (usually -105～250℃), its surface will be divided. When the resin is released, the adjacent resin on the conflict surface will be carbonized. When there is a binder, Patebon will foam and soften, causing the sealing surface to leak and add, and the seal will fail;

　　③, auxiliary seals (such as fluorine rubber, ethylene propylene rubber, all rubber) will be sensitive to aging, cracking, hardening and losing elasticity after exceeding the allowable temperature. The flexible graphite used today is resistant to high temperature and Corrosion is good, but its resilience is poor. And it is easy to be brittle, the equipment is simply damaged. 　　3.html,

How can we ensure the excellent quality of mechanical seal equipment? Development and application of a new type of mechanical seal for abrasion and corrosion resistance slurry pumps