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Join Date: Jun 2009
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Centrifugal Pump Health Check

04/15/2017 2:59 AM

Hello,

This is with regards to Centrifugal pump operations and maintenance. We have a few Centrifugal pumps in our plant that pumps chemicals, heavy density fluids, viscous fluids etc.. How do we constantly ensure that the pump is in good condition? Is there any kind of predictive maintenance tool to constantly monitor the health of the centrifugal pump? Is there any International standards pertaining to health check of Centrifugal pumps ( e.g API,)? Is there any procedure that can be shared?

The other issue is, sometimes the pump behaves well when tested in water and on that assumption, we start to run using some viscous fluid and it does not match the performance. Is there a way, we can check that the pump capability is not good while testing with water?

Is there some kind of non-invasive method we can do to check that the volute and the impeller has not worn out instead of opening up the pump to check these parameters. Is there an international standard mentioning about the tolerance of the Volutes and impellers ( such that beyond certain corrosion, the pump properties will change) or should it come from the manufacturer of the pump?

Any form of help is very much appreciated.

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#1

Re: Centrifugal pump health check

04/15/2017 3:17 AM

Well there are 2 things you should monitor, the amp draw of the pump motor and the operating temperature...this will tell you if the pump or motor is under any stress...the impeller should have a design life with the fluid you are pumping, and perhaps an operating hours maintenance teardown and cleaning recommendation.. the volume can be tested with a dump valve....to test the pump with lower viscous fluids, monitor the amp draw and restrict the head until the motor reaches regular operating amps...the more you have to restrict the flow to reach operating amp level, the less effective the impeller has become....so at some point you have a pass/fail level...

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#2

Re: Centrifugal pump health check

04/15/2017 3:41 AM

Yep,

  1. you could do motor temperature monitoring and establish a daily trend or per shift trend (Whatever is appropriate)
  2. Vibration Monitoring, unbalanced angular dynamics is a potential defect

Check out our host list of potential product suppliers for this. See product section.

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#3

Re: Centrifugal pump health check

04/15/2017 4:27 AM

Dear Mr.vanuta,

You may have to furnish details such as:

1. The Speed of the Pump and Linear Velocity of the Tip of the Impeller.

2.The Viscosity of the Fluid, and the Temp. of the fluid

3. Pump Suction Pipe Size and at pump inlet size. This will decide the Velocity of the Fluid, and whether this velocity is with in permissible limits. What is the Suction Head. Whether any Positive Suction is required for the viscous fluid.

4. The type of strainer and size.

Pl. post the above information and then CR4 Members can suggest.

DHAYANANDHAN.S

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#4
In reply to #3

Re: Centrifugal pump health check

04/15/2017 5:22 AM

Please stop shouting.

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#5
In reply to #3

Re: Centrifugal pump health check

04/15/2017 3:53 PM

Please stop assuming that all contributions to these columns are male; this is not the case.

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#9
In reply to #5

Re: Centrifugal pump health check

04/17/2017 11:08 AM

Good suggestion - in the industry my place of work serves, I've dealt with numerous customer engineers from India, (his location) and I believe we are somewhere near an even count in their gender.

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#6

Re: Centrifugal Pump Health Check

04/15/2017 4:15 PM

This is the sort of thing that develops with experience. Maintenance records tell the whole story.

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#7

Re: Centrifugal Pump Health Check

04/16/2017 2:10 AM

Is there any kind of predictive maintenance tool to constantly monitor the health of the centrifugal pump?

Yes... if you monitor the running current, flow rate and discharge pressure when the pump is new, as you continue to run the pump, you compare your readings.

Is there any International standards pertaining to health check of Centrifugal pumps ( e.g API,)? Is there any procedure that can be shared?

Yes.. but not often adopted and a bit sloppy really! It only ever applies to pumps use in the Oil industry, as a bench mark!

The other issue is, sometimes the pump behaves well when tested in water and on that assumption, we start to run using some viscous fluid and it does not match the performance. Is there a way, we can check that the pump capability is not good while testing with water?

All pumps are tested to produce a pump curve with water, as it has a known SG. Other fluid will have an unknown SG, so your pump curve is for water, not the fluid you are actually pumping. However, with a bit of calculation you can work out the flow rate, head, etc, etc!!

Is there some kind of non-invasive method we can do to check that the volute and the impeller has not worn out instead of opening up the pump to check these parameters.

No there is not a non-invasive method of checking, I refer you to my answer regarding monitoring of the pump while running.. that is the best way!

Is there an international standard mentioning about the tolerance of the Volutes and impellers ( such that beyond certain corrosion, the pump properties will change) or should it come from the manufacturer of the pump?
No there is no international standard, the size of material, design of the impeller is down to the manufacturer. The material that is used to make the parts might be covered by a standard.
Yes... any information on the pump, how it operates etc MUST come from the manufacturer.
As the pump impeller and defuser corrodes, that is, it wears away, then the efficiency of the pump changes. Again, if you monitor the pump from new, you will note the changes, and it will mainly be the running current in this case.
As the pump moves less fluid it does less work, so reduced RC compared to a new pump!

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#8

Re: Centrifugal Pump Health Check

04/16/2017 12:27 PM

There are some very solid answers here but monitoring and trending with ultra sound is a most valuable tool to follow the condition of the pump. UE and SDT to name two have the equipment and they can perform the training. I have used ultra sound for over 15 years and it keeps astonishing even me a trained operator.

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