Weight of water

[1930]

The greater the volume of water the greater the force leverage will be required to bring to the surface. I can easily hand pump an 80 ft water column out of 3/4 diam pipe but step up to a 1.5 inch pipe and its not so easy.

I have experienced this.

 

[plowhog]

I can easily hand pump an 80 ft water column out of 3/4 diam pipe but step up to a 1.5 inch pipe and its not so easy.

I have experienced this.

I don't understand that. You should be pumping against the exact same psi if all other variables are the same.

 

[MossRoad]

I have a 2" PVC pipe with an inside diam of 2.067 that is 100 feet long.

Also within that same pipe is a second sealed 1" pipe that has an outside diam of 1.315 same length.

How heavy will the water be?

My intention is to push that column of water from the bottom to the top and I need to know this answer so I can plan the rest of the pump accordingly.

Please dazzle me with how you came up with the answer. Thank-you

Area of a 2.067" ID pipe = (Pii / 4) x 2.067squared
(3.14 / 4) x 4.27 =
0.785 x 4.27 = 3.354 square inches

Area of a 1.315 OD pipe = (Pii / 4) x 1.315squared
(3.14 / 4) x 1.73 =
0.785 x 1.73 = 1.357 square inches

Volume of 2.067 ID x 100' pipe = 2.067 x 100'
2.067 x 1200" = 2480 cubic inches

Volume of 1.357 OD x 100 pipe = 1.357 x 100'
1.357 x 1200" = 1638.4 cubic inches

Subtract 1638.4 cubic inches from 2480 cubic inches = 841.6 cubic inches.

1 gallon displaces 231 cubic inches

841.6 / 231 = 3.64 gallons

1 gallon weighs 8.34 pounds

3.64 gallons x 8.34 pounds = 30.3576 pounds

Someone double check me, please. I've had some Captain Morgan and Dr. Pepper. :drink:

 

[kuschneider]

Volume of a cylinder = pi times radius squared X height (or length)
Whatever units you units, it will be easy to convert that volume to a # of gallons.

 

[kuschneider]

Pressure at the base of a water supply depends only on the height, volume of water is irrelevant. A tube of water 100' deep but only 6" wide will have the same pressure at the bottom as a lake 100' deep.

 

[plowhog]

A tube of water 100' deep but only 6" wide will have the same pressure at the bottom as a lake 100' deep.

That's why I don't understand the OP saying he can more easily hand pump a smaller pipe diameter, vs. a larger pipe diameter, if the height/lift is the same.

 

[pmsmechanic]

That's why I don't understand the OP saying he can more easily hand pump a smaller pipe diameter, vs. a larger pipe diameter, if the height/lift is the same.

Unless he's talking about two different sizes of pump. Then what he says makes sense.

 

[1930]

I thought it would be clear that I am talking about 2 different size of pumps, if the casing is larger or smaller than the pump is larger or smaller

If you study the link I gave I think you would agree that if the check valve is located at the bottom of the pipe just on the other side of the foot valve ( also a one way valve ) than once the water is sucked thru the foot valve and sucked thru the second one way valve it will require X amount of force to push it too the surface.

Are you suggesting that a 1/2 pipes water volume would require the same amount of energy required as a 4 inch pipe water volume?

How can that be? The water or the amount of water on the exiting side is going to constantly want to flow back downward causing the water at the inlet to require more effort to continue to push its way upward.

This is the only explanation I can give thru my experience. Im not able to go into further detail because I simply cannot explain it any better. Thanks

 

[LouNY]

I believe he is talking about a cup type hand pump,
on his up stroke he is lifting the entire column of water,
more water flows into the column under his cup.
As the center rod is lowered the cup goes back down to the bottom but the check keeps the water from backing down,
his cup seal only holds in the lifting direction

 

[1930]

I believe he is talking about a cup type hand pump,
on his up stroke he is lifting the entire column of water,
more water flows into the column under his cup.
As the center rod is lowered the cup goes back down to the bottom but the check keeps the water from backing down,
his cup seal only holds in the lifting direction

Thanks for taking the time to look at the links I posted 2 pages ago