3/4 water supply line - need to run another 120 ft to supply equine barn.

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TurboMan

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Adding an equine barn on our property. There is an existing pole barn which has a 3/4 copper supply coming into it. Water pressure is very good in the pole building. Need to supply the equine barn with good water pressure. Horses drink lots of water. The shortest run to the equine barn would be from the pole building with the 3/4 pipe.

New equine barn is 120 ft from the existing pole building and 200 ft from the house (supply)

Question: would I benefit by running a 1" or 1 1/4" copper pipe from the pole building to the equine barn? Would like to keep the pressure and volume as best as possible. Would rather not run a new line from the house to the barn. Septic tank is directly in line as well as irrigation lines and god knows what else.
 

wwhitney

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Short answer:

Using 1" pipe instead of 3/4" pipe will reduce the pressure drop by a factor of about 4 on that 120' run. I.e. a 3/4" line to a barn 30 feet away should behave like a 1" line to a barn 120 feet away.

Long answer:

Will the new barn mean more water demand, or just moving water demand farther away? Will the new demand be at the same time as current demand? If you specify the maximum simultaneous demand rate at each building, and the pipe network lengths going back to the water main, and the water main pressure, and the minimum pressure desired at the fixture given those demands, then you can calculate the required pipe sizes for each pipe segment.

Cheers, Wayne
 

Reach4

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As best as possible? You should be more practical. How many GPM?

100 horses each drinking 10 gallons per day could be supplied at 1 gpm to keep the trough full. https://www.menards.com/main/plumbi...8053-c-8672.htm?tid=812407089159389782&ipos=1
I don't know why these are on clearance, but there are others around.

So the flow rate would be more how much flow do you need to wash stuff down. Garden hose might do 5 gpm, but lets say 10 gpm for a heavy spray. A big pressure sprayer might be 5 gpm, but 1 or 2 gpm for the electrics.

Here is a simple calculator. http://irrigation.wsu.edu/Content/Calculators/General/Pipeline-Pressure-Loss.php

1 inch SIDR polyethylene pipe is more than 1 inch ID.

Using the calculator, it looks like 120 ft of 1 inch ID Pipe would drop 3.6 psi. Add maybe 2 more PSI for some joints etc.

 
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John Gayewski

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To answer the question yes you would benefit from running a 1.25" or 1" vs a 3/4
 
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