What will happen if lubricating oil is applied to the sealing end face of a mechanical seal?

Some customers, in order to facilitate pressing the mechanical seal into the sealing groove of the centrifugal pump during maintenance, 

apply lubricating oil to the static ring of the seal to make it easy to press the static ring into the sealing groove. 

Is this really the right practice? 

The professional analysis of ATACH Pump Industry is as follows:

Fault phenomenon:

During the sealing assembly process, it is necessary to keep it clean and ensure that the sealing rings of the moving and stationary rings are not scratched or broken. 

To facilitate installation, apply engine oil to the surface of the shaft or shaft sleeve and the mating surface of the sealing rings during assembly. 

Some people are accustomed to applying some lubricating oil and grease to the surface of the sealed friction pair, with the aim of preventing dry friction during operation and damaging the sealing end face. 

In fact, this is a wrong practice. 

Because lubricating oil contains some impurities, tiny particles, etc., applying lubricating oil to the sealing end face is more likely to cause sealing leakage.

The correct approach: 

When assembling mechanical seals, the sealing end face must be cleaned thoroughly. 

You can use clean lens paper and cotton gauze to wipe the sealing end face clean. 

Practice has proved that not applying oil to the sealing end face will not cause dry friction on the sealing end face. 

As long as the pump is filled with medium, a liquid film can easily form on the seal. 

Dry friction is mainly caused by the absence of medium in the pump or the centrifugal pump being evacuated and cavitation.