INLET AND EXIT LOSSES FOR PUMP 1

[davincigee]

Hi guys,
I need to find the inlet head losses and exit head losses for a pump rated at 140m3/hr at 62m. Can you please provide the formula for obtaining these losses.
* the inlet size is 4"
* the exit size is 3"

 

[LittleInch]

Is this related to your other post?

These losses are negligible.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[Artisi]

Why?


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.)

 

[davincigee]

Dear Guys,
Nope its not related to my other posts. I am developing a system resistance curve for a new pumping system project at our tank farm. I needed to factor in the losses at the entrance of the pump and the exit of the pump. I was hoping I could get the formulae.

 

[LittleInch]

If you mean between the flanges of the pump - that's part of the losses of the pump and is taken care of in the pump overall head gain. The pump curve is flange to flange in my experience.

If you mean the piping, then there are many equivalent length formulae about for reducers, elbows etc. For a system resistance curve that's what you need to know.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[SNORGY]

When in doubt, add another 1.5 velocity heads just to be sure they have been accounted for at least once.

 

[Artisi]

The day you can predict all the other losses with 100% accuracy will be the day you need to add "a bit" for inlet/ outlet losses.

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.)