Technical Query IPVS 2008

From S. L. Abhyankar Senior Member
March 22nd, 2008, 05:47 PM
Dear Mr. Ethanan,

Pump Curves is a generic term. Within that generic nature, there are four curves - H v/s Q, Input power required v/s Q, Efficiency v/s Q and NPSHr v/s Q.

These curves change due to 5 reasons - Speed, diameter, density of fluid Vapour pressure and viscosity. Most complex of these is change in viscosity, because it affects all parameters - H, Q, Efficiency (and in turn) Power.

As you have yourself rightly pointed out, one has to be systematic and cautious to use in Head as meters of liquid column. One must convert the values in pressure units to Head in meters of liquid column.

Hope, this clarifies.
Thanks, S. L. Abhyankar

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