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  #1  
Old 07-16-2010, 10:05 PM
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JayinMI JayinMI is offline
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Plumbing Problem

OK having an issue and yooper and I tried to figure it out but.......

I need to install a sprinkler system in a rental house. The WHOLE house is 1/2 copper EVERYWHERE. There is not even a way to turn off the wtr to the house except for the meter pit outside.

I need to know how many GPM I can get through the 1/2 copper. I can turn it into 1" about 2 ft before the PVB. The yard is small so I can put MPR's in the front, but will need 5004's in the back.

I know the "proper" way to do this would be to tie in right after the meter with another meter pit in the yard but I am trying to avoid this if at all possible.

Any help would be appreciated.
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  #2  
Old 07-16-2010, 10:10 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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Same rules apply. What is your pressure? Is it Type M or type L or type K?
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Old 07-16-2010, 10:15 PM
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Quote:
Originally Posted by FIMCO-MEISTER View Post
Same rules apply. What is your pressure? Is it Type M or type L or type K?
68 PSI at the hose bib. Type K copper.

FYI I am working an e-mail to send you about questions with the pigtails.
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Old 07-16-2010, 10:16 PM
bcg bcg is offline
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You really should tie in at the meter. 1/2" pipe only gives you about 6 GPM safely and it's going to be real hard to design a system on that. It can be done but you'll have to have so many zones that it's cheaper to tie in at the meter, which is the correct way anyhow.
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Old 07-16-2010, 10:26 PM
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Quote:
Originally Posted by bcg View Post
You really should tie in at the meter. 1/2" pipe only gives you about 6 GPM safely and it's going to be real hard to design a system on that. It can be done but you'll have to have so many zones that it's cheaper to tie in at the meter, which is the correct way anyhow.
I would not have a problem doing that if I was not paying for the system. If I were to tie in right after the meter it is going to cost ALOT. At 6 GPM I can do 3MPR's which will net me two zones in the front (45 X 15) and two maybe 3 5004's in the back depending on how I nozzle which would mean three zones.
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Old 07-16-2010, 10:28 PM
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Wow type K in a house? Around here you use to see type M cooper.
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Old 07-16-2010, 10:29 PM
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Originally Posted by sleepyhead View Post
Wow type K in a house? Around here you use to see type M cooper.
Old Old house........
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Old 07-16-2010, 10:29 PM
bcg bcg is offline
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You're also going to have really high friction losses with 1/2" pipe so you will want to make sure you calculate your hydraulics, including all pipe in the house that it may be running through.

I still wouldn't do it this way. I work on homeowner installed systems that are done like this and they just don't work very well.
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Old 07-16-2010, 10:32 PM
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Originally Posted by bcg View Post
You're also going to have really high friction losses with 1/2" pipe so you will want to make sure you calculate your hydraulics, including all pipe in the house that it may be running through.

I still wouldn't do it this way. I work on homeowner installed systems that are done like this and they just don't work very well.
I know this is not the proper way to do this. Like I said I am trying to avoid a second meter pit at all costs. I seen a doozy HO installed system the other day, right off the hose bib!
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Old 07-16-2010, 11:12 PM
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Be careful messing with old cooper, it might be paper thin and brittle.
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