Pump Low Discharge Pressure 1

[Sam6516]

The discharge pressure of a pump is lower than the calculated value of discharge pressure using the pump head. What could be the possible reasons?

 

[Artisi]

Wrong calculation.
Unfortunately, the crystal ball is a bit foggy today, therefore having problems sighting all the necessary data that might help.

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.)

 

[LittleInch]

Could be anything from:
Lower inlet pressure
Lower density of fluid
Lower motor speed
Higher flow
Smaller impellor

All this assume this is a centrifugal pump and difference from your calculated values.

Unless you've had a specific test, a lot of pumps are only good for +/- 10% from the generic curve

Like artisis says, there is zero data here to help you any further.



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

 

[TenPenny]

The first question that comes to mind is, what type of pump is this? Centrifugal or positive displacement?

Then there would follow many more questions.

 

[RVAmeche]

You could have excessive losses due to different piping/fitting/valve configurations from the pump calcs. If someone did a back of the napkin calculation, the pump could be running at a different point all together. Among a thousand other possibilities.

 

[1503-44]

Maybe 50 cycle instead of 60 cycle power supply.
Damaged or corroded iimpeller, seals, piston seals,
Faulty motor.
Hot day.
Clogged suction..
Its a very long list

 

[TBP]

If it's a 3-phase electric drive pump, check the rotation. It could just be running backwards.

 

[LittleInch]

So many questions

So few answers....

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

 

[1503-44]

As always when there is no useful information given.