We have a single stage centrifugal pump which is supplied by a 4 metre suction head drawn from a vessel that is under -70kPa of vacuum.
Pump NPSHR = 0.4 mtr
Process fluid = 46% Caustic in solution with Demineralised water
SP = 1.45
Viscosity = 1.37 cp
Fluid Temp = 115'C
Current Head = 23 mtrs
Current flow = 7.8 m3h @ 88% speed
Motor 2 pole with VSD
If the vacuum is raised to -80kPa what will be the effect at both the pump suction & discharge?
Topic: What is the effect at the pump suction and discharge if the vacuum is raised?
21 February 2008
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Re: What is the effect at the pump suction and discharge if the vacuum is raised?
21 February 2008 at 1:29pmTo answer your specific question, the effect of the reduction in pressure in
the tank will of course reduce the NPSH available at the pump suction.If the NPSH Available drops below, or close to, the NPSH required by the
pump, then the pump may begin to cavitate.
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