On Feb 3, 11:20 am, Andy Asberry wrote:
On Fri, 2 Feb 2007 22:38:58 +0000 (UTC), (Dave





Martindale) wrote:
Andy Asberry writes:

With a typical 1 7/8" working barrel, each foot of water column lifted
will weigh about 1.2 pounds. 100 foot depth to standing water
will require lifting 120#.

That's before any mechanical leverage applied at the handle. Also, the
piston diameter might not be the same as the pipe diameter - the max
size depends on the well casing. The force depends on piston diameter,
not water column diameter.

But no matter how you arrange the mechanism, lifting a certain volume of
water 150 feet will require at least 5 times the mechanical work
required to lift the same volume 30 feet. That was my point.

Dave

Actually Dave, I was agreeing with you. I was simply pointing out that
a column of water can quickly get heavy.

And for those who may not know, a working barrel is the cylinder. The
working valve is the piston. And Dave is correct, the piston area
determines the water column lifted.

It is common to attach a submersible pump to the bottom of the working
barrel and push water through it and the valves. Especially on
windmills when the wind doesn't blow. Only one pipe needed. And yes,
the rod pump will pull water through the submersible.

The son of a windmill man.

--Andy Asberry--
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- Show quoted text -

And to add a bit to that. The column of water that you are lifting is
only that from the surface of the water to the top. The pump can be
50 ft under the surface and none of that 50 ft adds anything to the
effort....well, I suppose 'inertia' might add a bit.

Harry K