i need some info on fluid (water)transfer using compressed air and a thingy that i spose you could call a venturi .
its to pump water from a hole in the ground,air is pumped down an airline and does a U turn through a venturi thingy at the botton,the water is then sent up another hose to the surface,i have a rough plan in my head but dont know the technical side,air speed/pressure/dimensions etc ,anyone know about such things?

I've used this principle, a long time ago, to clear sand from a submerged wreck. The air took the sand and small debris up the tube anf onto a sieve which drained the water.

But, it's use for water transfer would, I think, be very inefficient. A water pump will be much better.

This is the principle used by steam locomotives to put water into the boiler under pressure. Have a look for Live Steam Injector in google. The Wiki on this is not helpful, if I find any links I'll let you know.

Another thing to look at is a Hydraulic ram pump, this is another simple method of using a difference in height to make water move uphill, wiki is much better on this.

Caber

Sent you a drawing via e-mail. May or may not help.

cheers for yr replies peeps,confused,you have mail

Received and replied to.

Don't keep this to yourselves I for one am very curious! Does this need to be a continuous process or is it only to empty said hole.

If it's only to empty the hole how deep is it and what air pressure do you have available?

OK, here goes.
It depends.
Don't know.
55psig.
Hope that helps.

the holes are water wells,the ones we just did were 7 meters deep but only 3 meters from the thames so a high water table,others may be 100 or more meters deep,the venturi is to pump the water out at a rapid rate of knots to clean any debris left from the instillation of the tubes.
we are using a road compressor.like that used to run BIG kango,s,that can put out 100 psi but due to the crap venturi we have been using its working pressure is down to 55psi,any more q,s or sugestions feel free.

This is kind of similar to what I do for a living albeit on a smaller scale. I work for a company which uses a process called "coiled tubing" to perform clean outs and gas lifts for offshore oil and gas wells at depths of up to 20,000 feet. For lifting debris we would always try to circulate a fluid rather than a gas.

What kind of diameters are we talking about?

wells are 6" ID so a tad smaller than you are used to dealing with

U2U sent.

Most oil and gas wells are 5.5" ID. Have you tried flushing with water? A centrifugal pump would probably get a pretty decent rate in 7 metres of depth. What size of pipe / hose are you using? If you use a nice big piece hose / pipe it helps to increase the annular velocity which helps suspend material.

got it all working again today,dont know how....it just worked!
hose is 30mm ish id,its mainly sand and a few stones/slugs that have come to the surface