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Old 06-10-2014, 03:28 PM
ArTurf ArTurf is online now
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1.5" or 2" RP

Installing system with 2" mainline and max 40 gpm zones. Which one would you go with?

Last edited by ArTurf; 06-10-2014 at 03:32 PM.
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Old 06-10-2014, 03:48 PM
bcg bcg is online now
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On a Febco 860, you'll have 1 more PSI available to the system at 40GPM with the 2" RP. You have to decide if that's worth the additional cost of the 2" RP. You could actually safely go down to a 1.25" RP and stay at about 11 PSI at 40 GPM.

http://media.wattswater.com/ES-F-860S.pdf
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Old 06-10-2014, 04:02 PM
ArTurf ArTurf is online now
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Was looking for charts for break off points in determining size but couldn't find any.
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Old 06-10-2014, 06:01 PM
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AI Inc AI Inc is online now
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What is the water source?
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Old 06-10-2014, 06:03 PM
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Quote:
Originally Posted by ArTurf View Post
Was looking for charts for break off points in determining size but couldn't find any.
http://media.wattswater.com/ES-919.pdf
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Old 06-10-2014, 09:14 PM
ArTurf ArTurf is online now
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What is the water source?
City water 2" meter.
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Old 06-11-2014, 10:25 AM
enorl76 enorl76 is offline
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Wow, a 2" meter?! Is this a commercial operation I assume? I've only done residential. Never personally seen larger than 3/4" meter installed by the city (without specifying)
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Old 06-11-2014, 10:55 AM
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If you choose an RPZ that uses the same central casting for both the 1-1/2 and 2 inch sizes, there won't be great differences between the two at 40 gpm. The higher the supply pressure, the more the water hammer forces can be inside the device, so the more benefit to using larger pipe through the supply plumbing. (the larger the pipe diameter, the slower the water velocity, and that reduces water hammer)
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Old 06-11-2014, 01:07 PM
ArTurf ArTurf is online now
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Originally Posted by enorl76 View Post
Wow, a 2" meter?! Is this a commercial operation I assume? I've only done residential. Never personally seen larger than 3/4" meter installed by the city (without specifying)
High end residential. Close to million dollar new build. Potentially large area to water. The advantage is lowering the # of stations and reduced total watering times. Small difference in price from water co. $400
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Old 06-11-2014, 06:23 PM
Without A Drought Without A Drought is offline
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Small difference in price from water co. $400
A few years back i did a system comprised of 3 2" services. cost the property owner $20,000 for the 3 meters. I never got a clear answer why permitting was so much, but i think it had something to do with a high usage surcharge.
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