Cycle Stop Valves
Pump System Questions and Answers => Irrigation => Topic started by: rtodom12107 on September 03, 2014, 10:05:24 AM
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We are designing an irrigation system for a small Pecan orchard and had a question concerning maximum back pressure on 4" well with a 5 hp pump. The flows have been tested as the following:
GPM PSI
68 0
60 10
57 20
54 30
57 40
We are needing 25 gpm @ 25 psi. What will our back pressure be on this 5 hp pump? Will it create any problems with checkvalves, pipes, or pumps?
We did a similar installation with a Vermad valve on a different site and blew a rubber check valve in the well supply pipe.
Thanks for your time
Randy
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I am guessing you have a 55GS50 pump? If so and it will produce 68 GPM at 0 pressure, then the water level is at about 190'. With a water level at 190' that pump can develop 104 PSI backpressure. Any part of the pipe or fittings that won't handle 104 PSI is weak and needs replacing anyway.
I don't know what kind of "rubber check valve" would blow out from backpressure. But it sounds like a bad check valve to start with.