<VV> Suction pumps vs pushing pumps

[corvairduval at cox.net]

Ned, you are wrong on several accounts. The first being that you think I
said your pump can't work. Of course it does, I just mean it is not in the
best location. I also don't think you need to change the location until a
problem arises.

The statement "the reason one pump can suck water from a greater depth is
because it generates a greater pressure, ie is a more powerful pump" is
wrong.

A suction pump cannot be more powerful than the atmospheric pressure it is
operating against. A bigger pump will just get more flow, not a higher suck
point. The pump is just providing a vacuum, the atmosphere is providing the
push. At 33 feet, you run out of push available from the atmosphere. A
column of water 2.31 feet high is equivalent to 1 pound per square inch
(PSI) of pressure. 14.7 psi (sea level standard pressure) taps out at
33.957 feet. 

Check out Suction Head section of this web site:
http://www.ag.ndsu.edu/pubs/ageng/irrigate/ae1057w.htm

I also guarentee the oil pump moving oil through pipelines are pressure
pumps forcing the oil through the pipe, not sucking the oil from hundreds
of miles away. Just like deep well pumps push the water up from hundreds of
feet below the earth.

I wondered why my oranges tasted like apples....   ggg

Frank DuVal


Original Message:
-----------------
From:  aeroned at aol.com
Date: Mon, 04 Oct 2010 13:55:52 -0400
To: virtualvairs at corvair.org
Subject: Re: <VV> Electric fuel pump



Really? Thanks for that tid bit....
I guess it's a good thing no one told my electric powered rotary pump with
no check valve that it can't do what it's doing, fortunately it's not on VV.

Yup, you guys know more about fluid pumps, I surrender. Maybe I can get a
refund on all the schoolin' that obviously weren't right.

BTW the reason one pump can suck water from a greater depth is because it
generates a greater pressure, ie is a more powerful pump. Obviously the
pumps used to move oil in a long pipeline are not the same as an electric
pump on a Corvair, but then again apples aren't oranges.

Ned

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