OT: Physics/hydraulics of water and barrel
#131
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Re: Physics/hydraulics of water and barrel
"EDDIE O'CONNOR" <ronnoco@ns.sympatico.ca> wrote in message
news:YM0pd.184511$Np3.7470806@ursa-nb00s0.nbnet.nb.ca...
| The same amount of pressure. From the bottom hole it has to lift it's
| diameter in water, and from the top it has to lift it's own volume of
water
| in the hose up to the top so it can just gravity drop into the barrel.
Same
| amount of energy required by the pump.
Not quite. If filled by the top hole the lift is constant but maximum. If
filled by the bottom hole the lift is not constant but increases as the top
barrel is filled.
#132
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Re: Physics/hydraulics of water and barrel
"EDDIE O'CONNOR" <ronnoco@ns.sympatico.ca> wrote in message
news:YM0pd.184511$Np3.7470806@ursa-nb00s0.nbnet.nb.ca...
| The same amount of pressure. From the bottom hole it has to lift it's
| diameter in water, and from the top it has to lift it's own volume of
water
| in the hose up to the top so it can just gravity drop into the barrel.
Same
| amount of energy required by the pump.
Not quite. If filled by the top hole the lift is constant but maximum. If
filled by the bottom hole the lift is not constant but increases as the top
barrel is filled.
#133
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Re: Physics/hydraulics of water and barrel
"EDDIE O'CONNOR" <ronnoco@ns.sympatico.ca> wrote in message
news:YM0pd.184511$Np3.7470806@ursa-nb00s0.nbnet.nb.ca...
| The same amount of pressure. From the bottom hole it has to lift it's
| diameter in water, and from the top it has to lift it's own volume of
water
| in the hose up to the top so it can just gravity drop into the barrel.
Same
| amount of energy required by the pump.
Not quite. If filled by the top hole the lift is constant but maximum. If
filled by the bottom hole the lift is not constant but increases as the top
barrel is filled.
#134
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Re: OT: Physics/hydraulics of water and barrel
"mabar" <mabar@NoooSpamgrbonline.com> wrote in message
news:VIGdnbLJv73PijjcRVn-tA@gbronline.com...
| The formula for the amount of pressure coming out of the bottom or top
hole
| is:
|
| Each foot of height provides about 0.43 PSI (pounds per square inch) of
| pressure.
|
| The size or diameter of the tank does not matter. The pressure comes from
| the height of the water column. The pressure for any given height
difference
| (from top tank to bottom tank) would be the same with any size tank. A
| million gallon water tank 10 feet off the ground will have the same water
| pressure draining as a 10 gallon tank, 10 feet off the ground.
|
| Tom
|
I think the question was what was more efficient i.e. use less energy in
which case the pressure is (somewhat) irrelevant to the problem
#135
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Re: OT: Physics/hydraulics of water and barrel
"mabar" <mabar@NoooSpamgrbonline.com> wrote in message
news:VIGdnbLJv73PijjcRVn-tA@gbronline.com...
| The formula for the amount of pressure coming out of the bottom or top
hole
| is:
|
| Each foot of height provides about 0.43 PSI (pounds per square inch) of
| pressure.
|
| The size or diameter of the tank does not matter. The pressure comes from
| the height of the water column. The pressure for any given height
difference
| (from top tank to bottom tank) would be the same with any size tank. A
| million gallon water tank 10 feet off the ground will have the same water
| pressure draining as a 10 gallon tank, 10 feet off the ground.
|
| Tom
|
I think the question was what was more efficient i.e. use less energy in
which case the pressure is (somewhat) irrelevant to the problem
#136
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Posts: n/a
Re: OT: Physics/hydraulics of water and barrel
"mabar" <mabar@NoooSpamgrbonline.com> wrote in message
news:VIGdnbLJv73PijjcRVn-tA@gbronline.com...
| The formula for the amount of pressure coming out of the bottom or top
hole
| is:
|
| Each foot of height provides about 0.43 PSI (pounds per square inch) of
| pressure.
|
| The size or diameter of the tank does not matter. The pressure comes from
| the height of the water column. The pressure for any given height
difference
| (from top tank to bottom tank) would be the same with any size tank. A
| million gallon water tank 10 feet off the ground will have the same water
| pressure draining as a 10 gallon tank, 10 feet off the ground.
|
| Tom
|
I think the question was what was more efficient i.e. use less energy in
which case the pressure is (somewhat) irrelevant to the problem
#137
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Posts: n/a
Re: OT: Physics/hydraulics of water and barrel
"Mike Romain"
| > >Water is heavy. How many PSI comes out that bottom hole?
| > >
| > >The pump must first overcome this pressure before it can start filling
| > >the tank. That can easily mean the pump will 'run backward' and fill
up
| > >the truck if the top tank has enough weight in it.
| > >
| > Nonsense.
|
| Well you know, everyone else has explained why I was wrong, but you are
| wrong here with that snip quote.
|
| That is 'not' nonsense. If there is 100 psi in the line and the pump
| can only pump 50, it will flow backward.
But if you use the same pump to fill the tank in the first place there would
be no water in the tank to flow backward.
#138
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Re: OT: Physics/hydraulics of water and barrel
"Mike Romain"
| > >Water is heavy. How many PSI comes out that bottom hole?
| > >
| > >The pump must first overcome this pressure before it can start filling
| > >the tank. That can easily mean the pump will 'run backward' and fill
up
| > >the truck if the top tank has enough weight in it.
| > >
| > Nonsense.
|
| Well you know, everyone else has explained why I was wrong, but you are
| wrong here with that snip quote.
|
| That is 'not' nonsense. If there is 100 psi in the line and the pump
| can only pump 50, it will flow backward.
But if you use the same pump to fill the tank in the first place there would
be no water in the tank to flow backward.
#139
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Re: OT: Physics/hydraulics of water and barrel
"Mike Romain"
| > >Water is heavy. How many PSI comes out that bottom hole?
| > >
| > >The pump must first overcome this pressure before it can start filling
| > >the tank. That can easily mean the pump will 'run backward' and fill
up
| > >the truck if the top tank has enough weight in it.
| > >
| > Nonsense.
|
| Well you know, everyone else has explained why I was wrong, but you are
| wrong here with that snip quote.
|
| That is 'not' nonsense. If there is 100 psi in the line and the pump
| can only pump 50, it will flow backward.
But if you use the same pump to fill the tank in the first place there would
be no water in the tank to flow backward.
#140
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Posts: n/a
Re: Physics/hydraulics of water and barrel
"Jeepers" <moomesa@INVALIDfnbnet.net> wrote in message
news:moomesa-594292.10590024112004@news-east.newsfeeds.com...
| In article <30jsckF3182ubU1@uni-berlin.de>,
| "Ray Drouillard" <cosmicpam2@comcast.net> wrote:
|
| > you will want to have a valve to keep the water from running out through
the pump and
| > back into the barrel that's in the truck.
| > Ray Drouillard
|
| Same for the top fill hole hose? Won't want to run backwards?
|
| I'm gonna use the top fill hole anyway so I don't have to disconnect the
| drain hose from the cabin.
|
| I lost the physics argument, but I had the right idea.
Put a "T" at the bottom with a check valve to the pump side. Pump all the
water in you want without back flow to the pump.
BTW that's the way it's been done with municipal water tower for years.