OK, I'll gamble some egg on my face. In this case though, you would not
be "pulling a vacuum" with air (a gas) involved. If you can fill the
entire pipe with a liquid (water), the water that's down slope of the
water in the well on the other side of the ridge it would pull the water
out of the well and up over that ridge /as long as/ the pipe exit is
below the dynamic water level in the well and the pipe's intake.
The caveat: the pipe would have to be filled by pumping out
of the well (one time to set-up this siphon) and the exit end of the
pipe would have to be closed to be able to fill the pipe /completely/,
which would require an air vent (exhaust vent only, not intake) at the
highest point of the pipe going over the ridge. A valve would also be
required at the exit end for flow control and prevent the siphon from
drawing the well dry. The pipe would have to rated to handle the
crushing force of the vacuum being pulled on the uphill section of pipe
after it left the well. There could absolutely not be any leaks in the
pipe.
I hope my seat-of-the-pants physics is working today.
Bill
Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
On 1/27/2022 2:28 PM, Darryl Thayer wrote:
Yes, but if the rise is greater than about 30 feet (25 feet even) the
water head is greater than atmospheric and the water will draw a
vacuum in the pipe. These numbers depend upon the location
(elevation) and temperature of the water.
for example at 15,000 feet the atmosphere is about 1/2 or sea level,
meaning the water column will break at 15 feet of head. (from my high
school physics, this is the scale height) so that at 7500 feet the
water column is a maximum of 3/4 x 30 feet or 22 feet. this is from
memory and mine is not so good.
On Thu, Jan 27, 2022 at 3:51 PM William Miller
<will...@millersolar.com> wrote:
Colleagues:
All of our water pumping customers to date have been pumping water
to tanks higher in elevation than the well-head. Just now I am
looking at a system pumping to a pond that is lower than the
well-head and lower even than the bottom of the well. The 300’
well has the head at 1200’ elevation and pumping to a pond at 800’
elevation. The line goes over a 1500’ ridge. If there were
nothing impeding the water flow, would it not siphon to the pond?
Has anyone seen the basic physics available being used to advantage?
Thanks in advance.
William
Miller Solar
17395 Oak Road, Atascadero, CA 93422
805-438-5600
www.millersolar.com <http://www.millersolar.com/>
CA Lic. 773985
www.frenergy.net
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