BLISTERING damage and the shaft seals
The most common reason of the shaft seal failure is blistering. Blisters form unexpectedly and degrade the surface of the seal face causing irregularities in the running area which result in poor performance - higher leak rates and higher friction, this leads to the shaft seal failure.
Blistering is also known as dry-running in liquid bath. It happens because the lubrication oil contains a higher proportion refrigerant (liquid phase). The refrigerant will be forced to go into gas phase because of the heat developed by the shaft seal: the heat friction between the stationary- and rotating part.
The pressure of the refrigerant will lightly rise above the lubrication pressure and force out the lubrication film. The dry-running takes place. This phenomenon is known as blistering, dry-running in liquid bath or sometimes is called a corona effect. This process also explains the short life span of bearing in refrigeration compressor.
Read more about shaft seal failure and a "safe" double shaft seal.
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