Case: a circulating pump mechanical seal, as will the cracking gas of alkaline concentration is still higher alkali liquor to the high recycling use.The pump at the beginning of the start running condition is good, but operation after a period of time often leakage failure, therefore the maintenance frequency increase, increases the maintenance costs and product cost, long-term stable operation of the affected device.       

Case study:

A.Alkali mehcanical seal failure reason

General mechanical seal failure is mainly affected by four factors, namely, corrosion, heat loss, wear and installation and operation.After inspection found that the pump seal face no scratches and wear, so you can eliminate sealing surface physical injury reasons.Considering the sealed cavity crystal and rust is more, at the same time, combined with the mechanical seal failure of performance, preliminarily determine the transport medium easy crystallization and corrosion is the main cause of seal failure.

B.The mechanical seal failure to solve the improvement measures

1.Change the elastic element structure

The elastic element from spring to corrugated pipe, corrugated pipe is both the elastic element of the seal ring, save the original ring between the shaft sleeve and o-rings, only at the end with a ring gasket seal of the material, both to solve the contradiction between the o-rings seal and compensation, and the original quasi static seal instead of static seal completely, raise the reliability of sealing.Use corrugated pipe also saves spring mechanical seal transmission pin and ring and ring mating surface between, to avoid the caused by the deposition of solid particles and ring action failure, to further improve the sealing performance of the whole.Corrugated pipe provides both elastic compensation and torque, has better follow and compensation ability.

2.The static ring compensation instead of the ring compensation

Ring in the machine seal component parts quality is far better than the static ring is big, so the running rotating momentum is also big.Instead of static ring reduces the rotating momentum after compensation, improve the stability and reliability of the whole machine sealing components.

3.Increase the collar and sleeves clearance

Enlargement of the gap can avoid crystal and scale deposit, on the premise of guarantee the end face specific pressure increase ring diameter or decrease collar diameter.According to relevant information recommendation, the gap increased from 0.38 mm to 0.5 mm.

In view of the crystal and scale more actual situation, increase the amount of flushing can effectively solve the deposition of solid particles, reason should be the original washing line diameter from 12.7 mm to 19.05 mm.But that should be paid attention to the increasing aperture will lower the efficiency of the pump.

4.Increasing the inlet screen mesh

This measure can effectively prevent solid particles into the sealed cavity, provide mechanical seal with ideal working environment.

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