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OPERATION PROBLEMS

Operations that cause excessive shaft movement that will open or damage the seal faces Opening and closing valves in the suction and/or discharge causing the pump to operate off the B.E.P, and the shaft to deflect.
Pumping the supply tank dry, causing excessive vibration and heat.
Series or parallel pump operation can cause shaft deflection.
Running at a critical speed will cause the shaft to defect.
Cavitation problems:
Low N.P.S.H.
Air getting into the system through packing.
A stuffing box, suction recirculation line is heating the incoming fluid.
A discharge bypass line is heating the suction fluid
A discharge recirculation line is aimed at the seal face restricting its movement.
Water hammer is opening or damaging the lapped faces.
The piping system has been altered since the pump was installed.
The pump is being started with the discharge valve shut or severely throttled.
Starting a pump with the discharge valve open is just as bad.

Operations that cause excessive heat and corrosion problems Cleaners or solvents used in the lines can attack a seal component, especially the elastomer.
A product concentration change will affect corrosion.
A change of product.
Either a temperature or pressure change in the system will affect both.

Operations that cause the seal faces to open The seal is seeing frequent reversing pressures.
Loss or lack of an environmental control.
Flush not working.
Quench is shut off.
Barrier fluid not circulating.
Loss of heating or cooling.
Heating jacket clogged.
Pressure drop in the stuffing box.
Flushing with a dirty product.
Quenching with shop water leaves solids outboard Of the seal that will cause a hang-up as the seal moves forward to compensate for wear.
The quenching steam pressure is too high. It is getting into the bearings.

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