What Size RPBP/RPZ Should I Use For A 3/4" City Water Meter?

 
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Old 03-06-2018, 10:15 AM   #1
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What Size RPBP/RPZ Should I Use For A 3/4" City Water Meter?


A friend has a 3/4" (0.75") water meter at their 1.3 ac property. We want to do some fertigation with their irrigation so we're looking at a Reduced Pressure Backflow Preventer. The main line for the irrigation and hose bibs is going to be 1.5" PVC.

What size RPBP/RPZ should we use?

I was thinking that since I'm using the 1.5" mainline that we'd need a 1.5" RPBP/RPZ, but I feel like that's overkill given the 3/4" meter.

Thanks for any guidance on this. I don't want to get a mega overkill system going, but do want it to not be overly throttled and lead to irrigation issues down the line. Thanks!
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Old 03-06-2018, 05:19 PM   #2
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Re: What Size RPBP/RPZ Should I Use For A 3/4" City Water Meter?


What is the total water volume required for the irrigation system?

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Old 03-06-2018, 10:30 PM   #3
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Re: What Size RPBP/RPZ Should I Use For A 3/4" City Water Meter?


The meter is rated for 25gpm, the largest zone volume demand is about that (7 30' spray heads at ~3.5gpm). That help?
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Old 03-08-2018, 02:40 PM   #4
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Re: What Size RPBP/RPZ Should I Use For A 3/4" City Water Meter?


Local water authority said a 3/4" after the 3/4" meter will suffice. thanks!
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