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61

Irrigation / Re: Large Irrigation system

« Last post by EPStutes on January 03, 2024, 02:31:40 PM »

Thanks for pointing out that the CSV did not look right. 

Correction Made:  I had GPM and PSI swapped in my CSV friction calculation

So for a rate of 25.9GPM

CSV friction loss = 17.0 psi
CSV reduced pressure falloff = 14.8psi

152.76psi Pump Pressure (@25gpm) - 43.35psi Riser Head Pressure (100ft) - 7.97psi Riser Friction loss (1-1/4" ID @25gpm) - 31.81psi CSV DP(@25gpm) = 70psi CSV Outlet Pressure

Is that right?

I just want to confirm if the CSV-1A is best for my setup or if I need to go back to my well contractor to change it out.  My target is for a flow at the Pump sweet spot of 22-28gpm which seems to be right for the CSV-1A.

62

Irrigation / Re: Large Irrigation system

« Last post by Cary Austin on January 03, 2024, 08:41:07 AM »

I don't understand your "CSV outlet pressure".  With the CSV set at 60 PSI the outlet pressure should always be 60 PSI or less.  How much less depends on friction loss and reduced pressure falloff for the amount of water being used at the time.  With a large enough pump to make up for the friction loss you can push as much as 33 GPM though the CSV1A.  The outlet pressure of the CSV starts at 60 PSI, then is reduced by the reduced pressure falloff amount depending on the flow rate.

As long as the pump doesn't cycle off and you can live with the pressure at the sprinklers the CSV1A is fine.  But all those numbers would be a moot point when using the CSV3A2T as the CSV outlet pressure would be at 60 PSI regardless of the flow rate because there is no reduced pressure falloff.  Then the CSV3A2T is large enough that there is only about 3 PSI of friction loss possible.  Even the CSV12560-1 would work much better with that size pump. 

A CSV that is too small for the pump is like trying to suck a golf ball through a garden hose. It just ain't big enough. Lol!

63

Irrigation / Re: Large Irrigation system

« Last post by EPStutes on January 02, 2024, 05:09:44 PM »

Carl,

Thanks again for your input.  I tweaked the head counts in each zone.

Do these rate look more inline with the CSV1A sweet spot?

64

Irrigation / Re: Large Irrigation system

« Last post by Cary Austin on January 02, 2024, 03:54:04 PM »

29 GPM is really too much for a 1-25 GPM CSV1A.  But if the pump is large enough you can squirt that much water through it.  Reduced pressure falloff is how much higher you have to set the CSV pressure at 3 GPM flow to get what you want at 29 GPM flow.  With 30 PSI of falloff the CSV would need to be set at 90 PSI (using a 80/100 pressure switch) to get 60 PSI at 29 GPM flow for the big zones.  There will also be more than 30 PSI friction loss, which means the pump must be able to do 29 GPM at 90 PSI to get 29 GPM at 60 PSI out of the CSV1A.

The CSV125 or the CSV3A2T would be much better for a 29 GPM zone/pump as they do not have reduced pressure falloff, and are larger valves with much less friction loss at 29 GPM flow.

If you can split up the zones and make them all smaller than 20 GPM the CSV1A will work fine.

65

Irrigation / Re: Large Irrigation system

« Last post by EPStutes on January 02, 2024, 03:36:07 PM »

Cary,

Sorry, I may not understand the way a CSV works correctly

Assuming an 60 psi header pressure, my individual zone rates range from 13 - 29gpm based on the number of heads in each zone.

How should I determine the DP of the CSV-1A correctly based on the flowrate and CSV inlet pressure?

I was just referencing the attached CSV Reduced Pressure Fall Off Chart based on the flowrate.  Do I need to add the friction DP to that also?

And how does changing the setpoint impact the pressure reduction chart?

66

Irrigation / Re: Large Irrigation system

« Last post by Cary Austin on January 02, 2024, 09:11:22 AM »

With a 60/80 pressure switch setting the CSV can be set to maintain 70 PSI constant.  That decreases the differential pressure to about 125 PSI, which is perfect for the CSV1A.

67

Irrigation / Re: Large Irrigation system

« Last post by EPStutes on January 02, 2024, 08:11:08 AM »

Thanks for the quick response. 

I was planning to set the stop pressure to 80psi which is the recommended max operating pressure of the sprinkler control valves.

68

Irrigation / Re: Large Irrigation system

« Last post by Cary Austin on December 31, 2023, 11:09:54 AM »

Looks correct. So, even with a 50' water level and a back pressure of 195 PSI, setting the CSV for 50 PSI leaves 145 PSI differential pressure.  150 PSI is max differential we recommend for the CSV1A, so setting it higher decreases the differential and gives you more pressure at the sprinklers.

69

Irrigation / Re: Large Irrigation system

« Last post by EPStutes on December 31, 2023, 08:03:15 AM »

Cary,

Good morning.  I am also in the process of setting up a large sprinkler system.

My zones rates will range from 10gpm to 28 gpm assuming a 50-75 psi output pressure from the CSV

Pump is a Franklin 25JS3S4-PE and the pump and topsides rate/pressures are shown in the attached table.

The well company installed a CSV1A with a 20gal tank.  Am I figuring the CSV output pressures as shown in my table correctly?  Is this the best setup for my application?

Thanks,

Eric Stutes

70

Frequently Asked Questions / Re: System overhaul recommendations/advice

« Last post by Cary Austin on November 06, 2023, 12:52:56 PM »

The highest pressure shallow well jet pump I know of is the J15S, which will build 83 PSI max and work with a 50/70 switch and a CSV setting of 65 PSI.  https://www.lockewell.com/index.php?main_page=product_info&cPath=1_3_155_92&products_id=549

To get up to 60/80 with the CSV set for 70-75 PSI you will need a multi-stage centrifugal or a submersible.  Here is a multi-stage.  https://www.lockewell.com/index.php?main_page=product_info&cPath=1_3_86&products_id=1743

If you drop in a submersible you can use a pump like this for a fraction of the price.  https://www.ebay.com/p/18030648622

Any of them will work with CSV or the PK1A kit.  But to go 50/70 pressure or higher I would recommend the heavy duty pressure switch and the 10 gallon size tank.  Even with the heavy duty switch you can still turn it down as low as 30/50 if needed.   https://cyclestopvalves.com/pages/pk1a-pside-kick