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well water pressure loss over distance

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well water pressure loss over distance bodega 10-27-2006
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Posted by bodega on October 27, 2006, 5:43 pm
Can anyone tell me of a simple way to determine pressure loss over
distance in Gallons-per Minute of well water? Example: Assuming I have
10 GPM at the well head, if I run a 2" ID water line 100', what loss in
GPM will I get? The tables I have been able to find all refer to loss
in water pressure (PSI). I need to go about 600' from the well head to
the new house and want to know if it is even practical to try to
utilize the old well.


Posted by Chas Hurst on October 27, 2006, 6:38 pm

> Can anyone tell me of a simple way to determine pressure loss over
> distance in Gallons-per Minute of well water? Example: Assuming I have
> 10 GPM at the well head, if I run a 2" ID water line 100', what loss in
> GPM will I get? The tables I have been able to find all refer to loss
> in water pressure (PSI). I need to go about 600' from the well head to
> the new house and want to know if it is even practical to try to
> utilize the old well.
>

According to Glover's Pocket Ref -2nd ed- 10 gpm thru a 2" plastic pipe will
loose .03 gpm per 100'.
Glover's Pocket Ref is a very handy book.



Posted by James on October 27, 2006, 7:29 pm
If you have anything near 10 gpm at the wellhead, you will have more water
than you will ever use, even if you went 3000 feet.

I have a very small spring that produces about one gallon per minute. I
pipe it 1200 feet uphill, and never have any problem.

Good luck !!


--james--



Posted by Steve Barker LT on October 27, 2006, 10:40 pm
You need to worry more about how much rise (or fall) the line has. Each
foot of rise will reduce Pressure (not volume) by about .4 lb i believe it
is.

--
Steve Barker



> Can anyone tell me of a simple way to determine pressure loss over
> distance in Gallons-per Minute of well water? Example: Assuming I have
> 10 GPM at the well head, if I run a 2" ID water line 100', what loss in
> GPM will I get? The tables I have been able to find all refer to loss
> in water pressure (PSI). I need to go about 600' from the well head to
> the new house and want to know if it is even practical to try to
> utilize the old well.
>



Posted by Bobk207 on October 28, 2006, 3:21 am

bodega wrote:
> Can anyone tell me of a simple way to determine pressure loss over
> distance in Gallons-per Minute of well water? Example: Assuming I have
> 10 GPM at the well head, if I run a 2" ID water line 100', what loss in
> GPM will I get? The tables I have been able to find all refer to loss
> in water pressure (PSI). I need to go about 600' from the well head to
> the new house and want to know if it is even practical to try to
> utilize the old well.

bodega -

I hope you don't lose any gpm....cuz all the water going to the pipe
at the well head better be coming out of the pipe at the
house....otherwise you've invented a "matter destroyer"

Your pump has certain preformance capability

flow (gpm) at various pressure (head) levels

ranging from.......

lots of flow at very little pressure to very low flow at high
pressure

the length, material & condition of the pipe & elevation change will
determinw how much head (pressure) drop will be suffered from well head
to house


here is a pressure loss calcaulator, you can play around with it

http://www.freecalc.com/fricdia.htm

2" PVC (600ft) with 10gpm flow will lose less than 1 psi
1.5" pipe ~ 3psi
1" pipe ~ 30psi

1.5" pipe is probably signifcantly cheaper than 2" & you can probably
handle ~2psi extra pressure loss

so unless you're pumping a long way uphill in addition to the 600 ft
AND you have a really wimpy pump you should be fine

cheers
Bob


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