Low performance in centrifugal pump
Low performance in centrifugal pump
(OP)
Hello!
We are having serious problems with a centrifugal pump, it is overcharged, I mean the operating electric current is higher than the nominal one.
This pump is giving the head of liquid for the flow rate according to the rated condition point but the electric motor input power is higher. The overall efficiency is 35%.
The pump was cleaned and mud was removed.
The operating conditions are:
-higher density fluid
-lower process temperature
-rated suction pressure
I hope you can help us.
Greetings.
We are having serious problems with a centrifugal pump, it is overcharged, I mean the operating electric current is higher than the nominal one.
This pump is giving the head of liquid for the flow rate according to the rated condition point but the electric motor input power is higher. The overall efficiency is 35%.
The pump was cleaned and mud was removed.
The operating conditions are:
-higher density fluid
-lower process temperature
-rated suction pressure
I hope you can help us.
Greetings.
RE: Low performance in centrifugal pump
Best regards
Morten
RE: Low performance in centrifugal pump
Pump output power: 28.7 kW
Density: 0.794 (specified 0.750)
Viscosity: 0.37 (specified)
RE: Low performance in centrifugal pump
Regards,
RE: Low performance in centrifugal pump
RE: Low performance in centrifugal pump
When I size the motor of a pump, I always take a check of the curve end (low pressure and high flowrate), make sure motor is big enough if the operating point swifts.
RE: Low performance in centrifugal pump
Suggest you research the change in viscosity due to the lower process temperature and the need for this lower temperature. The densities you give suggest a hydrocarbon liquid, so the effect could be significant.
Or fit a bigger motor if the pump will take it.
Cheers
Steve McKenzie