Pressure Guages at Suction

[jrrocks]

In closed loop chilled water pump system, my discharge side pressure gauge shows 30m (3kg/cm2) and suction side pressure gauge shows 5m (0.5 kg/cm2). To calculate the power of my pump which is 70% efficient, head should be consider only for discharge i.e. 30m OR should I consider 35m (30m discharge + 5m suction) OR 25m (30m-5m)?

 

[LittleInch]

It's differential head that the pump is supplying to the system so in your case here it is 25m.

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[georgeverghese]

Agreed, diff head would be 25m if both suction and discharge PG readings are in kg/cm2 guage.

 

[jrrocks]

Thank you team