How we can calculate pump discharge by using pressure difference?

Question

How we can calculate pump discharge by using pressure difference?

Answer 1

The easiest way with only pressure differential across the pump is to compare to the pump performance chart.  You may need to go back to the supplier/manufacturer if you don't have the chart lying around.

Your second option is performing a flow analysis of your discharge piping (much too involved to get into here) in order to get pressure drops and then correlating to your measured pressure.  

Answer 2

Well along with Tony B you are going to have to do a flow analysis since you've already got the pump in the system (I believe by the pressure difference). You've got to know what kind of system you have it in to be able to determine the discharge. That's gonna go back to pump head, head of tanks, flow work required for the pump to even move the liquid, headloss throughout the system, elevation or height...many many variables. Are there valves in this system?

  

Basically you have to start at point A and go to point B which is beginning to end of the system. There are a few formulas which could work but my advice would only be helpful if this is a VERY simple system with say 2 tanks, the pump, and piping.

You have to determine the pressure inside the tanks whether they are open to atmosphere or pressurized. Also the height differences (if any) of the tanks. Next you're going to have to find head from the tanks. Then onto pump head which may be given on the pump. More into fluid dynamics you will have to understand kinetic energy, potential energy, flow work, headloss, volumetric flow rate, etc. There really is no easy way to put it. Try looking in wikipedia for equations such as bernoulli's differential equation. Hope this helps.

Answer 3

You can calculate pump discharge by getting the differential pressure across a calculated o*****e. Flow ,Q=cvAV

where cv is a constant and A the o*****e area and V the differential head converted to velocity.

Refer to Flowmeter Engineering.