Discharge head or Differential head

[nabeel3]

Dears
Which head does the pump curve show?
Discharge Head or Differential head developed by the pump

 

[EdStainless]

For a centrifugal pump you need to read the fine print.
It is sometimes (more commonly) Differential, and sometimes Discharge at a specified inlet condition.
The latter is more common with submersibles where the curve may be for discharge at a minimum submergence.

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P.E. Metallurgy, consulting work welcomed

 

[LittleInch]

I would say 90% of the time or more it's differential head.

But read the notes carefully.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[nabeel3]

Dear Edstainless,

What if, the maximum submergence is given for a Submersible pump

 

[bimr]

Max submergence is the maximum depth that a submersible pump should be installed. I would expect that is the maximum pressure that the pumps seals can handle before starting to leak inside the motor housing.

 

[Artisi]

The submergence of a pump or inlet below water level does not reflect in head calculation other than the friction loss thru' the pipe / hose. As bimr has pointed out, the max submergence given is to ssfe gaurd the motor/pump sealing.

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.)