System Control Method for Centrifugal Pumps 2

[gilus02]

Hi;

For a centrifugal pump we usually use a pressure gauge or flow meter to know whether the pump is working properly or not. Choosing between these two gauges I just know one preference;
We usually use a pressure gauge unless when the performance curve is too flat to detect the operating flow by reading the pressure, so in this case we will switch to use flow meter.
I appreciate you if you share your experiences about the control systems for a Cent. Pumps. Your comments about positive displacement pumps are also welcome!

Thank you all!

 

[Artisi]

Have you thought of measuring power input.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[DRWeig]

Unless the client has a very austere budget, we like to monitor all three -- input power (kW), pressure, and flow. That is, as long as there is a need to monitor the pump.

If we could only pick one, I'd choose Artisi's method. It'll also give you direct indication of a broken coupling or a broken belt on a fan/compressor.

Best to you,

Goober Dave

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[gilus02]

Thank you two!fair enough.

 

[QualityTime]

1. I would continue to use the flow meter. For an operator it is a no brainer. He just looks at the readout.

2. Using a pressure gage requires some math by the operator (i.e. he either adds the suction and discharge pressure gauges if it is a suction lift situation or he subtracts the suction gage reading from the discharge gauge reading if he is in a flooded condition). It also requires him to understand a pump curve to know where he is at on the pump curve. If I did not have a flow meter I would use this scenario

3. Unless the operator is trained to relate power input to motor and pump flow conditions this form of measurement may not be helpful to him. It is helpful to an engineer when selecting a pump but directly helpful to an operator

Having both (1) and (2) is ideal