erniegalts wrote:
On Mon, 14 Jul 2003 05:41:23 GMT, Gunner
wrote:


On 13 Jul 2003 18:32:51 -0700, jim rozen
wrote:


In article , Gunner
says...

A thread came up a day or three ago, about building some sort of
motor
to run a small generator or a belt to supply power to :stuff: in
either remote locations or in the event of a long term power failure.

I think that in most remote locations the major factor would
be lack of fuel. So it would have to take into account
the local fuel supply if any. Most remote areas you find
folks pumping or lifting water by hand or other human power.

That's probably the most important thing an engine can do.

For a non-remote area the most important thing would be
sanitation, water supply (again) and garbage disposal.
A good reason to be out of a populated area where one
could have a) an outhouse, b) a hand-pump well.

Some places water wells are far too deep to be able to operate a hand
pump, while modifying an generator or mechanical pump to run from a
belt drive would not be that hard.


Depends on what sort of pump you envision. A traditional "pitcher
pump" operates on the principle of creating a vacuum in a chamber
controlled by valves.

The water is forced up by atmospheric pressure at STP.

So, roughly, you are talking about a limit on a hand pump at surface
level of perhaps 32 feet or so.

If you want, you can "mechanize" such a hand pump to provide 100, or
1000, or even a million strokes per minute...but you cannot suspend
the laws of physics.


A surface pump is limited, as a practical matter, to 22-24'

A down hole pump is limited by the materials and power available.
A standard oil field pump, using 10 Hp, will lift water at a rate of 10
gallons per minute from @ 2000' with no problem.
A multistage pump, with 100 Hp, will go down to @ 15,000'.
The big boys, with 2000 Hp, lift 1000 gallons/minute from 25,000'.

What's a down hole pump, you ask?
Simple enough, in principle.
Two one way valves and a piston mounted at the bottom of a pipe, with
a vertical reciprocating rod attached to a power source at ground
level running up the center of the pipe.

_______________________________Side of Well_________________________
___________Pipe Wall_____________________________________________
//Piston |2nd
=======ROD======================================== || and / Valve
____________Pipe wall_____________________________||_Valve____|__
_______________________________Side of Well_________________________


Shown horizontally simply to be easier to draw in ASCII :-)

Piston goes down (right), lower valve closes, upper valve opens.
Piston goes up, upper valve closes, lower valve opens, fluid fills
space below piston.
Piston goes down, fluid in space flows above piston.
Piston goes up, lifting fluid above piston, while space refills.
Continue as needed for fluid to reach surface.

At surface, shown vertically:

||
rod Rod is attached to rotating wheel or walking beam to
|| move it up and down.
/||\
/ || \
| || |
| || |
| || |_______
| || ________outlet pipe
| || |
| || |

David Hughes