Is there any way to determine the psi of a pump when other specs of the pump are known?

Question

I'd like to determine the psi of a pump. All that is listed in the specs is the Horsepower, the Capacity (GPH), and the discharge head (in feet).

Is there some way to calculate the psi based on this info?

Thank you!

So, if the head is listed as 15 ft, does that mean the pump delivers 6.5 psi of pressure?

Answer 1

'Head' is a term used for 'Static Head Pressure' or the pressure exerted by a height (head) of fluid.
And, Yes..15ft head OF WATER will give a pressure of 6.5 psi. (15 x 0.433 = 6.5psi)
The discharge head in feet...
= Head x 0.433 x S.G. of the liquid.
e.g. a 30 foot head of water = 30ft x 0.433psi/ft x 1.0(S.G. of water) = 13 psi.
For gasoline, with an S.G of 0.750...
30 x 0.433 x 0.750 = 9.75 psi.

Note: Discharge head also depends on the suction head.
That explanation will make this write-up much longer.

Answer 2

the head which is written in pump sepc. is differential head i.e. the pump will add 6.5 psi to the suction pressure. more will be the suction pres, higher will be the discharge pressure. Remember for a pump differential head is constant, that means if density of the fluid changes, the discharge pressure will change but the differential head remains constant. That is why pump's specification are given in head instead of pressure.

Answer 3

Ask the manufacturer for a copy of the pump curve. The pump will put out different pressures as the amount of flow changes. You can probably find the web site on the Internet.

Answer 4

The discharge head is directly linked with the pressure.
Each foot of water equals 0.43309 PSI (that is, assuming the discharge head is expressed in feet of water and not some other fluid)

Answer 5

To get PSI just divide the discharge head, in feet, by 2.31 feet per psi.

Answer 6

Gonna need more info for this one, start with the usage requirements for the equipment you are supplying. That should give you something to talk about with the local sources. The size of the terrariums and the amount of water in each one, the height that you want to lift the water is another factor to be considered. Be sure to include the diameter of tubing to be used and any special features, fountains, misters, etc. Good Luck

Answer 7

After you convert head to pressure, remember that the pump puts up DIFFERENTIAL head. That means you have to add whatever suction pressure you have to the differential pressure to get the discharge pressure.

Also, if you are pumping a fluid other than water, you need to know the density or specific gravity.

H = P*2.31/SG
H = head (ft)
P = pressure (psig)
SG = specific gravity of fluid

Answer 8

[Shaft horsepower
=sp.gravity*flow rate*head/75 [mks system]]

Pressure IN psi
=Sp. gravity*Head/2.31,
=1*15/2.31
=6.50 psi.
Divide the KG/CM^2 by 14.22, you will get psi.
1 feet = 0.304 8 meter
15 feet = 4.572 meter
[Pure water at 4°C (max. density) was chosen as the 'base line' for specific gravity and given the value of 1.]

[1 foot of water [4 °C] = 0.433 527 502 pound/square inch
15 foot of water [4 °C] = 6.502 912 529 pound/square inch
http://www.onlineconversion.com/pressure.htm]

*As per your question, you must have taken data from name plate/test report.
So, your head and discharge given are at design point , if you see the charactoristic curve[It is the best efficieny point data]

Answer 9

If you are looking for the head in SPI, then all you have to do is convert feet of water to PSI. 1 foot of water equals 0.4335 PSI.

Answer 10

of course, when u design a project using Bernoulli's theorem, u can determine the most economical pump required.