Author Topic: Maximum back pressure on a CSV  (Read 4594 times)

rtodom12107

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Maximum back pressure on a CSV
« on: September 03, 2014, 10:05:24 AM »
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

Cary Austin

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Re: Maximum back pressure on a CSV
« Reply #1 on: September 04, 2014, 07:12:40 AM »
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.