Which mechanical seal failures do different wear marks of sealing surfaces indicate

Checking mechanical seal sealing surfaces’wear marks can help analyze the causes of mechanical seal failures. This article is to classify them in details.

1. Wider wear: It indicates that the pump has serious misalignment.
The reasons are: (1) Bearing damage;
(2) Shaft vibration or shaft deformation;
(3) Shaft bending;
(4) Pump cavitation produces vibration;
(5) The coupling is not aligned;
(6) The pipe is seriously deformed;
(7) The stationary seat is inclined.

2. The wear scar is narrowed: the wear scar is narrower than the minimum width of the two sealing surfaces of the mechanical seal, which indicates that the sealing surface is deformed by pressure or temperature rootly caused by overpressure.

3. No wear marks: indicates that the sealing surfaces of the mechanical seal are not attached. The method is to check whether compensating mechanisms such as springs of the mechanical seal are slipping or obstructed.

4. The sealing surface（s） of the mechanical seal has no wear marks but bright spots.
Warpage of the sealing surface（s） will show bright spots without wear marks.
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