[elky] Re: Way off topic...but sorta scientific: water pressure and flow
- From: "Rick Draganowski" <dragan@xxxxxxxxxxxxxx>
- To: <elky@xxxxxxxxxxxxx>
- Date: Mon, 13 Dec 2010 14:49:21 -0800
Every inch of water in the pipe coming down from the elevated reservoir exerts
pressure in all directions based on its weight since it has no rigidity. So if
you just think of it as as the height and the density you can see how a small
tall reservoir would exert the exact same pressure as a large one the same
height. So as you lower the top level of fluid you decrease the pressure
proportionally. Size or area has nothing to do with water pressure but much to
do with the total force of an area. So one square foot at 1psig is the 144 lbf
just one square inch is one lbf. The pressure is just a function of column
height. Little less an half a lbf psig per foot depth.
Note I use the normal nomenclature for gauge pressure which does not include
atmospheric pressure.
psig pounds per square inch gauge
psia pounds per square inch absolute
lbf pounds-force
This is the same principle as use in a hydralic lift where a small pump pushing
hydralic fluid against a large piston can lift tons. Slowly.
Rick Draganowski
(Soli Deo Gloria)
----- Original Message -----
From: Ray Buck
To: elky@xxxxxxxxxxxxx
Sent: Sunday, December 12, 2010 2:45 AM
Subject: [elky] Re: Way off topic...but sorta scientific: water pressure and
flow
Thank you. Can ya tell me why? I'm sure it's very simple physics but for
some reason it isn't clicking in my head. I'm gonna go google it a bit.
r
On 12/12/2010 12:05 AM, Rick Draganowski wrote:
Yes. The distance from the top surface of the reservoir to the discharge
opening determines the water pressure above atmospheric.
Rick Draganowski
(Soli Deo Gloria)
----- Original Message -----
From: Ray Buck
To: elky@xxxxxxxxxxxxx
Sent: Saturday, December 11, 2010 9:46 PM
Subject: [elky] Way off topic...but sorta scientific: water pressure and
flow
Fluid pressure. Does the pressure behind a fluid increase with the
height of its storage reservoir? I see lots of cities' water reservoirs in
huge tanks 100 or so feet off the ground. Is this better than...say 20 feet
higher than the highest point in the town? If this is a law of physics, I
don't know it...and don't think I ever investigated this area before.
Here's the deal. We wanna test some fluid (we're gonna use colored
water) flowing thru a clear plastic pipe and I came up with one design, my
partner with another. His plan was to have 2 55 gallon drums mounted on a
level surface and "push" the fluid thru the tube with a sump pump and catch it
in the other. The pump pressure/volume is unknown at this time.
My plan was to mount the reservoir drum...say...6-10 feet higher than the
pipe and use a valve to control the flow into the pipe which would exit into
the catch drum; then use the sump pump to replenish the reservoir drum.
Is there any outstanding merit or disadvantage to either system (apart
from the fact that his way is easier to construct?)
Thanks,
r
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