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A rancher friend of mine asked me this question today and I thought it was too complex for me to answer as I am a carpenter and this does not come up in my line of work:
If a water supply containing 10 acre ft of water is 100 feet above the land to be irrigated and has a slope of 45 degrees, a regulated 12 in pipe is inserted at the bottom of the reservoir as the pipe gets smaller the pressure becomes greater but the volume gets smaller. The question is what is the greatest size pipe at the bottom of the grade that will give 125 psi. the slope is 300 feet long and at the bottom the pipe will be attached to a sprinkler system the pressure cannot exceed 125 psi.

2006-07-07 12:00:42 · 6 answers · asked by Anonymous in Science & Mathematics Mathematics

this is gravity feed no pumps

2006-07-07 12:23:18 · update #1

6 answers

I'm trying to remember what my High School Physics said about water pressure in an open system.

A cubic foot of water weighs about 62.5 lbs. A cube one foot on each side has a base of 144 Sq In. Therefore each Sq In has about .42 lbs of pressure. If the water supply is 100 ft above the sprinkler then the pressure at the sprinkler should be 42 lbs/Sq In.

However, I’d switch to the physics section to get a more reliable answer.

2006-07-07 12:26:13 · answer #1 · answered by SPLATT 7 · 0 0

3

2006-07-07 12:16:37 · answer #2 · answered by Anonymous · 0 0

Ok tell him this lol.
one sqare ft of water 10ft tall weights around 624lbs. Devided by 144sq inches it would have a psi of 4.33 PSI at bottom of colume . He can go from there lol.

Is he going to use gravity fall or is he going us a pump of some kind?
this will make a differience lol. he can get 125psi but may have very low water volume coming out the end of pipe.

Ok tell him to go with an 8in pipe all the way down then restrict at very bottom. he can us a valve to regulate his pressure at the bottom of colume. or go 12 inch all the way and do the same thing with it.

Tell him use a pump lol. if he can sustain a psi of 125 lbs, if he doubles the dia of pipe used he can get four times the water volume at same psi rating.

2006-07-07 12:16:51 · answer #3 · answered by jjnsao 5 · 0 0

At 250 feet below the water level he has to insert. That will give him 125 PSI. This is an approximate and will do for engineering work.

Approximately 30 feet owater will give 15 psi. If you want accurate analysis you have use accurate numbers

2006-07-07 12:23:26 · answer #4 · answered by Knowsitall 2 · 0 0

Run the better diameter furnish (3/4") as close as available to point of use, then cut back to at least a million/2". this can maximise available furnish. like you, a lengthy time period in the past i'd have given you formulated rigidity losses, although the mandatory plumbers rule of thumb. `as large as available, as close to as available nevertheless stands`. Smaller pipework (as with roads) causes lack of momentum at heavy lots.

2016-11-01 09:51:26 · answer #5 · answered by ? 4 · 0 0

it all depends on what size pump you r using & how many sprinkers your going to run.there is a way to lower & raise the psi with a valve near the pumps

2006-07-07 12:14:35 · answer #6 · answered by blueberry wine 2 · 0 0

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