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Negative pressure head

Negative pressure head

Negative pressure head

(OP)
Can somebody explain to me what negative pressure head means for a centrifugal pump? I had to design a centrifugal pump to increase the flow rate in a gravity feed slurry line, and ended up with a pump that must develop a total pressure head of -12 m.

RE: Negative pressure head

It doesn't sound quite right.  Unless there is an error with the negative sign, this implies your pump is acting as a turbine!

It is possible the assumptions you have used in your model don't match reality.  Is any part of the pipe flowing part full?

Can you give us a more detailed description of how you came to this conclusion?  A description of the system would also help (static elevations, pipe lengths, operating philosophy etc).

Once we do a "quick and dirty" HGL I'm sure it will be crystal clear!

Cheers
Aussie Mike


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