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Old 08-17-2011, 09:41 PM   #1
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Sizing water supply line


Hello all!

I am new to the site and hoping for some help...

New construction of a 4BR/2Bath ranch house in country. Will be on county water (not sure of flow rate yet) via a 3/4" meter. House will be about 500 feet from the meter (negligible elevation change). What would be the recommended SCH 40 PVC size supply line from the meter to the house? I have been told 1" , 1 1/2", someone even suggested 2", so I appeal to you guys for a definitive answer!

Thanks!

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Old 08-17-2011, 10:43 PM   #2
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Sizing water supply line


Need to know your pressure to size it correctly

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Old 08-18-2011, 05:44 AM   #3
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Need to know your pressure to size it correctly
OK. I will check with the county and update the thread.


Thanks!
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Old 08-18-2011, 08:09 AM   #4
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Sizing water supply line


While you're talking to the county, see if sched 40 pvc is allowable in your area.
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Old 08-18-2011, 05:40 PM   #5
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Sizing water supply line


The county is telling me 80-100 psi. That sure seems high, but I don't have the meter yet, and I guess they would know!
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Old 08-18-2011, 09:36 PM   #6
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The county is telling me 80-100 psi. That sure seems high, but I don't have the meter yet, and I guess they would know!
that is not uncommon pressure in my area.
So, now you know your pressure, length, elevation change and fixture load. All you have to do now is use google or your library to find sizing charts, plug in your info and you're set! Or perhaps your water district might have the info. I'd do it for you but my code book is at the jobsite
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Old 08-21-2011, 07:58 AM   #7
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Sizing water supply line


After running the numbers on an internet sizing calculator, it looks like I should use a 1 1/4" supply line.

Is there any benefit (or perhaps negative impact) if I were to use an 1 1/2" SCH 40 supply line the entire 500'? Then reduce it back down to 3/4" where we will tie it into the house?
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Old 08-21-2011, 09:31 AM   #8
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The benefit would be that you have more options with a larger pipe. Like adding outbuildings in the future. Drawbacks? Just cost, nothing else.
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Old 08-21-2011, 09:34 AM   #9
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The benefit would be that you have more options with a larger pipe. Like adding outbuildings in the future. Drawbacks? Just cost, nothing else.
Great! That may be the way to go then; better to do it right the first time and future proof a bit, than try and go back and do it again.

Thanks for all the advice!
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Old 08-21-2011, 09:36 AM   #10
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Lots of primer, lotsa glue, and have fun!!
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Old 08-21-2011, 09:54 AM   #11
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Sizing water supply line


At 500 feet, you may want to look into continuous pipe. You can generally get HDPE (high density polyethylene) or PEX in continuous rolls, you may even be able to get a 500 foot roll. If your municipality allows it for buired water supply, this will avoid the need to join pieces of PVC.
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Old 08-21-2011, 09:56 AM   #12
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At 500 feet, you may want to look into continuous pipe. You can generally get HDPE (high density polyethylene) or PEX in continuous rolls, you may even be able to get a 500 foot roll. If your municipality allows it for buired water supply, this will avoid the need to join pieces of PVC.

Ahh, I hadn't considered that, will definitely look into it, thanks!
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Old 08-22-2011, 04:11 AM   #13
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Sizing water supply line


Quote:
Originally Posted by davemh View Post
After running the numbers on an internet sizing calculator, it looks like I should use a 1 1/4" supply line.

Is there any benefit (or perhaps negative impact) if I were to use an 1 1/2" SCH 40 supply line the entire 500'? Then reduce it back down to 3/4" where we will tie it into the house?
youll have plenty of volume that way,then just reduce it to 3/4 somewhere before meter.
I ran a water service almost 1500' one time,started with 2" k copper finally got it down to 1" just before entering house.
his old service ran about same distance but came in 3 blocks over through a cemetary to another main,it was only a 3/4" service all the way! he was much happier with the new water!

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