Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
(OP)
We are thinking about using power monitor to protect some small centrifugal pumps (from 3HP to 10HP, 3-phase, 480V) from deadhead in a chemical plant. But we were told that it won't be reliable and accurate for small pump application. We are not sure if newer instrument products are available for this application now. Here are my questions:
(1) Do you have real experience of successfully using power monitors on similar small pump deadhead protection?
(2) If you do, can you please recommend the power monitors (brand and model) that you used in your cases?
(3) Do you have other suggestions or concerns for doing this way?
Thank you in advance for your helps.
(1) Do you have real experience of successfully using power monitors on similar small pump deadhead protection?
(2) If you do, can you please recommend the power monitors (brand and model) that you used in your cases?
(3) Do you have other suggestions or concerns for doing this way?
Thank you in advance for your helps.





RE: Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
RE: Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
By the way, I just heard that Eaton C441 or C445 may work for small (3-10HP) pumps - measuring the motor power and protect the pump from deadhead... Has anybody successfully used it for similar application?
RE: Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
If you don't like pressure and flow switches, you can always look deeper into the process downstream and see if there are any variables (i.e. % opening of a certain valve downstream) that are affected rapidly if the pump gets dead-headed, and use those variables for detection of dead-head conditions.
Dejan IVANOVIC
Process Engineer, MSChE
RE: Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
Other thing you might be able to use are differential pressure across the pump or some sort of basic flow meter which should register flow when running so you can see when it fails
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RE: Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
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RE: Motor Power Monitor for Small Horsepower Centrifugal Pump Deadhead Protection
Regards,
Lyle