How can I convert Gallons per minute into PSI?

Question

I have a 1 1/2 inch pipe making 7.6 gpm, Im trying to figure out what the PSI is to see how much volume I will loose if I increase pressure with say a 3/4 line

the length is 200 ft + or - with an increase of 70 feet from bottom to top.

Answer 1

Do you have fluid with a high viscosity or there is some solids in the fluid. If you can provide the type of fluid, temperature, specific gravity and viscosity, then can calc if the losses due to pipe friction.

The head loss due to elevation is what you will also have to cover. (1) psi is equal to 2.307 feet in elevation, so 70 feet equals 29.5 psi.

Note, if you have a flow element for control in the line, that could add 3 to 5 psi to the overall head loss. Also, globe valves have a high pressue drop also.

Then when you add all the loses up (29.5 psi for elevation + pipe losses + valves looses), add an additinal 10 to 15% for a safety factor and you got it.

Edit:
Assuming water at 55 Deg F, Schedule 40 Carbon Steel Pipe, straight run of pipe with no control valve, the total head loss is 71 feet, (30 psi)

Same assumptions, going to a 3/4" pipe, the head loss goes up to 101 feet, (43.8 psi)

Answer 2

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RE:
How can I convert Gallons per minute into PSI?
I have a 1 1/2 inch pipe making 7.6 gpm, Im trying to figure out what the PSI is to see how much volume I will loose if I increase pressure with say a 3/4 line

Answer 3

PSI stands for pounds per square inch. It usually refers to air pressure. In this matter, you are replacing air with water. Multiply your gpm by 10 and you will have PSI pressure. You do not want to go above 120 or you will blow those two sizes of pipe out really easily. Legal PSI is 80 in any factory or workplace. You really do not need more than 60 PSI. 60 PSI is still a lot of water pressure.

Answer 4

With 70 Ft of available head pressure from the elevation difference, changing from a 1 1/2" pipe size to a 3/4 " pipe size will make no reduction in the flow. There is already a greater restriction in the piping system that predominates the total pressure loss. That is what is restricting the flow to 7.6 gpm. Differing dynamic losses within 200 ft. of either size of these two pipes is not the governing factor in this particular case involving the reduction of 7.6 GPM to something less.

Answer 5

your Psi with a 1 1/2 pipe at 7.6 gpm is almost zero. with the same psi you will get twice the gpm each time you increase the pipe size by 1/4 inch

Answer 6

Pressure drop in a pipe depends not only on the diameter and flow rate, but also the length (which is not given) 7.6gpm for a 1.5 inch pipe is not all that much and the pressure is probably quite low (unless the pipe is, say, 10 miles long)

Answer 7

22 gpm

Answer 8

I have some question, in datasheet from customer 250 USGPM, and they want to me to provide DP Transmitter. Please advise and share information to me, what should I choose for the pressure?..
Thank s.