At the top of a 40' well, we have a check valve prior to pump.
With the check valve below the pump, can a hand pump be put on and used with the electrci pump?
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16 years ago
well question
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- posted
16 years ago
Probably, but you will need a check valve between the hand pump and the user for the electric pump.
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16 years ago
In other words, the check valve there now keeps the water from flowing back into the underground reservoir. When you add the hand pump, you need to add another check valve in the pipe going to it to prevent the electric pump from sucking air through the hand pump instead of water from the ground. Both check valves are to stop back flow.
I'm assuming you want a way to get water when power is out??
Tom J
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16 years ago
The hand pump will already have an internal check valve. An addition check valve will be needed so the hand pump can't draw water from the user of the electric pump.
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16 years ago
I gotta add a valve will be needed to shut off the hand pump when it's not in use, otherwise the electric pump will pump thru it.
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16 years ago
Yes. The idea is to get water with no power, at least cost.
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16 years ago
Then my discription will work just fine, although I prefer my way, a transfer switch on the power panel with a generator hooked to the transfer box!!
Tom J
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16 years ago
Who comes up with these questions ? I need to know what he means by a 40' well. A hand pump has limits as to how high it can lift. Then, if the lift isn't too great, I envision a T in the main line and a shutoff valve between the T and the hand pump.
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16 years ago
I just realized the lift is 40'. A hand pump won't lift more than about 22'.
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16 years ago
Buy a generator.
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16 years ago
Depends on the pump - 1 of those little $15 short handle pumps, you are correct - the larger long handle, long stroke with tight pipe and good check valve, you are wrong. We use to hand pump from 60 feet down to a tank on a platform 20 feet up before we got electric power. We did finally hook a single cylinder gas engine to a jack stand to operate the pump before getting electric to the farm. It would fill a
1000 gallon tank using 1/2 gallon of gasoline!! Yes, I'm talking about a loooong time ago!!Tom J
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16 years ago
Type of pump doesn't matter unless it's a jet-pump. The theoretical maximum height is about 27', practical height is about 22'.
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16 years ago
He's having what one might call a "pipe dream".
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16 years ago
Bwahaha! Good 'un. How's the maple surple doing?
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16 years ago
formatting link
at the 100L hand pump. The one we had back in the 1930's wouldn't lift 500 feet like this will but it DID do what I said it did!! Some people just don't have a clue and all they know to do is turn on the faucet.
Tom J
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16 years ago
Those systems place the pump down in the well within 22' of the water. You obviously are not aware of the physics or mechanics involved with pumping water. The atmosphere will only support a column of water about 29' high. It's exactly the same as a mercury barometer. The atmosphere will support a column of mercury about 30" high and no more. It's you that hasn't a clue.
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- posted
16 years ago
. . Okay, I've been following this thread, admittedly not knowing (or rather, not remembering from school) the maximum height a column of water could be without assistance.
That being said, I distinctly remember the old-style hand pumps... the kind you find in state camping grounds, and used to find in highway waysides, and people who had them on wells with a water table WELL below
22 feet.So, I did a little checking, and came up with this table:
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(there's a nice table about halfway down the page).
Am I wrong in thinking this is a standard hand pump, or is this NOT what you and Tom are talking about?
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16 years ago
I'm not talking about different pumps. The pumps are all the same. The pump you linked to is placed down in the well-close to, or in the water. The 22' is not dependent on manufacture or design, it is the maximum height of a column of water that atmospheric pressure will support. I didn't come up with that figure; some scientist 400 years ago did. Please catch yourself up.
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16 years ago
The 2nd picture down is the shape of the pump we had on the farm that did lift water from 60 feet down and pushed it 20 feet higher to a tank. As the data table shows, those old style pumps were capable of bringing water from 100 to 200 fett down!!
You have observed well - those are the type pumps that most windmills were connected to all across the country before electricity was brought to almost everyone.
Tom J
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- posted
16 years ago
There are two kinds of pumps in this discussion. If the pump depends on suction only and everything but the pipe is above the water, you can not pump more than around 30 feet vertically. You are creating a vacuum and are depending on the atmospheric pressure to push the water up the pipe.
If parts of the pump are below the water level , then is is mostly a function of how much power or force you have to move the water. It can be much more than 30 feet.