G: Why Is My Centrifugal Pump Not Working Properly?

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    Centrifugal Pump
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Discussion Overview

The discussion revolves around troubleshooting issues with a centrifugal pump that is not functioning properly, specifically focusing on why it is not pumping liquid despite being positioned under a tank. The scope includes practical troubleshooting steps and considerations for pump operation.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant suggests ensuring the pump has a good prime, indicating this is a likely cause of the issue.
  • Another participant emphasizes checking that the pump driver is rotating in the correct direction and that the pump is not deadheaded.
  • A different participant raises the possibility of an "air trap" in the piping, which could prevent proper operation by allowing air to accumulate in the pump cavity.
  • One participant reiterates the initial question and adds several troubleshooting checks, including verifying power source, motor rotation, open isolation valves, and potential impeller damage.

Areas of Agreement / Disagreement

Participants present various troubleshooting suggestions, but there is no consensus on a single cause or solution for the pump's malfunction. Multiple competing views and approaches remain in the discussion.

Contextual Notes

Limitations include potential missing assumptions about the pump's installation and operation, as well as the need for further clarification on the specific conditions under which the pump is not functioning.

maxx_payne
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hello guys here's another question
my pump not pumping liquied althoug the pump is under the tank why ?
 
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Pump basics...Have you looked at:
- Making sure the pump has a good prime (most likely the cause).
- Making sure the pump driver is rotating in the right direction.
- Making sure the pump is not deadheaded.
- Making sure your flow instrumentation is correct.
 
along with what fred said, make sure that the piping does not form an "air trap" which could allow a pocket of air to fill inside of the pump cavity. Input and output lines that come out of the pump and go down can cause this. It makes the pump the place where all air slowly collects.

dr
 
maxx_payne said:
hello guys here's another question
my pump not pumping liquied althoug the pump is under the tank why ?

Does it have source power?
Is it turned on?
Does the motor driving the pump rotate?
Are the isolation valves open?
Is the impeller damaged?

CS
 

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