# Raising a bucket of water

We have a well which has water but it's a long way down , say 100 meters. At the top of the well I have a see-saw with a bucket at each end , equally balanced.

When the buckets are both empty they balance. When the buckets are both full , they still balance. When one bucket is full it tips the see-saw down and the other end tilts up. When I empty the water it re-balances again. By filling up and emptying the bucket, it causes the see-saw to go up and down. The empty bucket is positioned to drop and scoop up a bucket of water (with every bucket/stroke).

That's probably fine when the water is at the same level but when it's 100 meters down we have to put a pump in the circuit - a sucker rod pump - here is a diagram. Sucker Rod Pump (from Internet Glossary of Pumps)

The sucker rod pump drinks a bit at a time, with valves that help maintain pressure etc. Until it sucks the water to the surface - let's say, one bucket at a time. This time I have had to expend let's say, 100 buckets (strokes) of water to raise 1 bucket of water. I call this priming the pump - before we can see any water appear we have to prime the pump to build up the pressure (like a lift pump http://www.animatedsoftware.com/pumpglos/liftpump.htm).

My query is: if the above is correct and it takes 100 buckets (or you could say 100 strokes) to lift 1 bucket of water - how many strokes does it take to life the next bucket of water ?

One stroke or 100.

I think it is one stroke but my friend thinks it's still 100.

Can anyone enlighten me.

Thanks
John

 johnzule Posts: 18, Reputation: 1 New Member #11 Mar 3, 2007, 09:16 PM
Pardon my avid interest, but it's a make or break deal to know what is happening.

This pdf just might have enough info for a physics expert to decipher if the Sucker Rod Pump uses some valid tricks to overcome the enormous hydrostatic pressure to take the next 'gulp' - at the bottom which in turn pushes out the same - at the top... Or it just uses a mighty big motor with a lot of push. The fate of the free world depends on it.

http://www.osti.gov/bridge/servlets/...wable/3261.pdf

Patriot Down Stroke Sucker Rod Pump

"The PATRIOT PUMP loads the barrel on the upstroke with the bottom discharge valve closed held on seat by the hydrostatic pressure in the tubing. Since the plunger is solid and longer than the barrel, there is NO hydrostatic load on the plunger. On the upstroke, all the pumping unit and prime mover are lifting is the buoyant weight of the rod string."

sounds like it to me but hey, the free world will owe a huge debt of gratitude if a certain physics expert can confirm.
 Capuchin Posts: 5,319, Reputation: 3601 Uber Member #12 Mar 4, 2007, 01:40 PM
The thing is, I don't know how you would make a pump that would only lift 1 bucket at a time, unless it actually was a bucket on a string.

The only remaining question is how much man power do you need.

Well, Village pumps lift water from wells to the surface, and those are man powered, so I doubt it takes the marvel of modern technology to do the same nowadays.

I don't know the details, but I don't see why it isn't doable, it's up to you to find the right thing for the job though, I don't have time to read through this stuff att he moment
 johnzule Posts: 18, Reputation: 1 New Member #13 Mar 4, 2007, 02:04 PM
1 bucket = 1 portion (the amount is not important) the concept is. A portion is a pre-determined amount calculated in the design - so 1 bucket might be 1000 litres of water - and in essence it is on the end of a string but it's called a "rod".

Yes how much power indeed. Well I've seen references indicating 15 HP motors with a costing of \$10/day... So that doesn't sound big - but it also sounds too easy.

Yes - hand-pumps are not rocket science.

Guess you're having fun (the fun is in having lots to do and not doing it.) Thanks for your help. Much appreciated.
 johnzule Posts: 18, Reputation: 1 New Member #14 Mar 16, 2007, 03:00 AM
My findings:

The Sucker Rod Pump uses a counter-weight and 10-15 hp motor to drive a rod with a piston at the base some 10,000 feet to pump up oil by creating around 4000 psi and thereby having the pressure to build a water column from the bottom up - so one gulp at a time enables it to build a water column so the first gulp appears at the top many gulps later - it's ok for the oil industry 'cause they don't care if it's inefficient 'cause we pay for it.

It's not a ram, it works like I hoped, but it only drinks around 10 liters per gulp so I need around 1000 suckers which doesn't sound like that many since one is born everyday.

10 litres x 6 drinks/minute x 60 minutes x 24 hours = 86,400 liters per day or 865 units

There's nothing like coal to get the job done.

Cheers

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