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# water supply line size?

#1
04-28-16, 04:57 AM
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Join Date: Apr 2016
Posts: 3
water supply line size?

I am getting a typical 4/2 mobile home put out on some family land. I am being told a few different things about the size of water supply line size to run. I'm going about 900 ft from a 3/4 meter to a 3/4 house. I plan on using rolled poly. Can someone break it down on the technical side of it?

Last edited by Nathan Roux; 04-28-16 at 04:59 AM. Reason: spelling
#2
04-28-16, 06:07 AM
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Join Date: Feb 2006
Location: USA
Posts: 6,906
Supply Line

The plumbers will be along soon.

I would use 3/4 pipe from the meter to the m/h.

Not sure what you mean by "technical side".

#3
04-28-16, 06:21 AM
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Join Date: Apr 2016
Posts: 3
I know there is some sort of chart or formula they go by . That's what I mean when I say "technical". By the way, this is on level ground, no inclines or declines.

#4
04-28-16, 03:36 PM
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Join Date: Dec 2010
Location: Galivants Ferry SC USA
Posts: 18,183
Goes by fixture units

2 bath home?

Bathtub or bath/shower 4 units x 2 = 8
Clothes washer 4
Dishwasher 1.5
Hose Bib 2.5
Kitchen Sink 1.5
Lavatory 1 x 2 = 2
Toilet gravity tank 2.5 x 2 = 5

More may be added if you have whilpools are seperate showers. How about irringation system?

About 25 fixture units.

According to the plumbing chart you need a 1" meter and 1 1/2 pipe to the home.

@ 500 ft it will produce 49 units. Since you are 900 feet we divide that by 2 and get 24.5 units..

I would use 3/4 pipe from the meter to the m/h.
3/4 meter and 3/4 service @ 1000 ft produces only 2.5 units.. ( Your water will trickle out the faucets IMO)

And these charts are for copper.. Pex will be less as the ID is smaller.. You may need a 1 1/4 meter...

Call your water department and ask about the meter... They can easily tell you specifics on what you need to do..

#5
05-02-16, 10:46 AM
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Join Date: Apr 2016
Posts: 3
Thank you for the information. I just left the water dept and they pretty much told me I was forced into a 3/4 or 5/8 meter. Their main is a 3in line and "we have other big houses on this line using a 3/4 meter that works fine." Even tho I told her 900 ft run. So in your professional opinion , could i run a 2 in line from meter to the house and be good? I have a buddy that works at plumbing supply house and he asked a plumber his thoughts and he told him " 2 in is a bit overkill that I should run a 1 1/2 line off the 3/4 meter.

Last edited by Nathan Roux; 05-02-16 at 10:51 AM. Reason: added information
#6
05-02-16, 01:25 PM
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Join Date: Dec 2010
Location: Galivants Ferry SC USA
Posts: 18,183
I have a buddy that works at plumbing supply house and he asked a plumber his thoughts and he told him " 2 in is a bit overkill that I should run a 1 1/2 line off the 3/4 meter.
According to the plumbing chart you need a 1" meter and 1 1/2 pipe to the home.
I would run the 1 1/2 yes..

And possibly they have higher pressure there too.. Its a good idea to test the psi before you hook up to the home.. A pressure reducing valve may be needed.. ( You want the psi entering the home to be no more then 80 psi..)

Pex is good for 160psi @ 70F..( long term burst rating) Underground of course will be cooler.. The highest psi I ever saw in a home was 130psi so no worries there I assume...

But you never know.. with a 3 " main at the street who knows what the psi is.. You may need something at the meter if its real high psi..

Im curious to find out...