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"Correction" on my first reply

Posted by Charles on July 26th, 2001 02:14 PM
In reply to Water supply line 700' long. What size do I need? 1" 1.5" by jim morgan on July 22nd, 2001 11:53 PM [Go to top of thread]

I forgot to apply the orginal losses to the entire pipe; The first ones I stated apply only to a 100' section.

let's assume you require ,say, 20 gallons per minute flow to your home.

for 3/4" pipe: pressure loss at the end of 700' pipe is about 38 psi per 100' of pipe due to friction. So if the main header has 60 psi where your pipe connects, you will see about 260 psi lost at your home. This says that you will only receive a "trickle". This is assuming the 700 feet is not on an incline, which will reduce pressure even more.

using this same concept:

1" pipe -- about 77 psi lost in the pipe.

1.5" pipe -- about 14 psi lost in the pipe.

2" pipe -- about 4 psi lost in the pipe.

I don't actually know your flow requirements. Flows higher than 20 gpm will cause higher losses. I would suggest the 2" pipe to allow for water usage inside and outside at the same time.

Be aware that this is "to your house" and you will experience more pressure drop as the water enters and flows through the smaller pipes within your home.

Hope this helps

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