Pump Pressure and Flow

Google should be your first stop, always:

• FLUID POWER FORMULAS
  
• Fluid Power Formulas, Hydraulics - Engineer's Handbook
  
• Pump Design Equations Formulas Calculator Discharge ...
  
• Pump Flow Rate, Flow Rate Calculation, Flow Calculator
  

It's too difficult to plug in a formula.... There is a variety of pumps where the design can be different because of pump efficiencies.

Well to start with, get a reference point... And to get that gather the pump information.

- Name of pump manufacturer

- Pump model

- Size of impeller

- Horsepower

- RPM

- also the suction head pressure

Then either contact the distributor with this information, or now-a-days they even have the pump curve on their (manufacturers) website. And line up the pump information with the pump curve and you have a reference point. (Pump curve is usually base on 60-70 degree water.)

This is usually sufficient. For volume (flow), pressure and efficiency

Make use of a search engine and look for flow measurement principles. You will find what you look for there.

I think it's like asking how much current a battery can supply given the terminal voltage. It depends on the design of the pump.

Waste of time when you can phone up the manufacturer and get a performance curve for practically every pump on the market, isn't it? Manufacturers publish these things as a guide to pump selection, for goodness' sake!

Dear Mr. bolang,

There are several suggestions from CR4 Members.

My suggestion is as follows:

You know the Pressure and you know the Dia. of the pipe at the Delivery side and you know the material of construction of the pipe - which will help to use appropriate Frictional Co-Efficient.

Now the formula is Q = (A x Ca) x (V x Cv) where, Q = Discharge/Sec., A = Area of the Pipe, V = Velocity of the liquid, Ca = Correction Factor for Area, Cv = Correction Factor for Velocity.

The velocity can be calculaed as follows: V = Sq.Root of (2 x g x H) where V is the Velocity, g = Acceleration due to Gravity, which is 9.81M/Sec^2, H = Head in Metres on Discharge side.

Since you know the Pressure, you have to convert it in to Metres and for Water you can use the value 1.03 Kg/cm^2 = 10.75 Metres Head. If other than water the density factor will come in to picture, i.e. Head x Density will have to be used. If frictional factor is used the Ca and Cv is taken care. You have to be careful in using the units in per second basis,

DHAYANANDHAN.S

However dear friend, the OP apparently will not know what roughness coefficient to plug into the model. It is more than the type of the material the pipe is made from, it also includes the degree of corrosion internally.

Agreed, he has many suggestions to base a preliminary answer on, including yours, so he can correctly size of whatever flow metrology he wishes to install later.

thx for the reply, this is the most relevant so far