Resurrection of a CFEI 100 KVA Induction Furnace

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hermetic:
Before you go for a borehole pump, you could drop a pipe in with a foot valve, and see if you can get the desired flow rate with a surface pump, or even a waterproof pump down the hole in the bigger area. it would be a juggle to see if you can get enough water for enough time without exceeding the 32ft limit, but weld up a good strong mesh cover for the borehole proper if you go down the mansteps!
Phil

awemawson:
Those Man Steps are NEVER going to enjoy my foot fall on them if I have anything to do with it :lol:

I have looked at 'sump pump' types and they do have certain advantages, however the advantage of a bore hole pump below the water level is that you can be sure that it will always self prime, and is unlikely to over heat - also they tend to have quite different pressure / flow characteristics. I want reliable self starting, as now the wife has an eye on the 'free water' for her green houses and poly tunnels, and to be fair it would be pretty simple to swap their feed from a mains source to the bore hole as their 25 mm MDPE pipe happens to pass close by and currently feeds seven of our twenty nine (!) outside taps

awemawson:
The bore hole is not recovering as fast as previously - it's come up a long way but it's still at least 5 foot from the surface. So I imagine that the upper strata were saturated, and when I pumped the bore down, like a sponge they released their water but now that water is no longer there, so what I'm seeing is more of a true rest level :scratch:

It's not a problem to me as my bore hole pump will be suspended about 15 metres down the hole.

But may be a problem, and I'd welcome comments and suggestions on this, is TORQUE

Imagine a 1.1 kW long thin motor / pump assembly suspended from 15 metres of pipe / cable / stainless steel wire. It will tend to twist each time it starts and stops. In a conventional bore hole where the bore of the pipe is perhaps four inches, you can get rubber friction collars to slide on the flow pipe that grip the wall of the bore pipe to stop this. But in this situation where it's more like a well than a bore I'm not sure what is the best way to restrain it other than perhaps paddles clamped to the pump body.

hermetic:
This is interesting https://cr4.globalspec.com/thread/26623/Submersible-pump-torque. The only submersible pump I have had anything to do with was a huge old Beresford with a glass fronted cabinet star/delta starter, which fed water to the now gone Glaxo powdered milk factory (the first in the uk, installed 1934, later became Twydale turkeys processing plant) and it just hung in the borehole, under the crane that lifted it up and down. How I wish I had photos of it. Being star/delta, it started with less of a kick. Is your pump single or three phase? Install soft start? I searched on "torque reaction on borehole pumps" and saw mention of a "torque reaction bar" so searched on "borehole pump torque reaction bar" and got a welter of info. However, the torque reaction is going to be exerted against the delivery pipe, which you would have thought would return the pump to aproximately the same position after every start. It may be that suck it and see might be the way forward (see what I did there?) It may also be that pumping the borehole will start to bring up silt and iron bacteria slime which, after it is pumped away, may improve the recovery time, assuming the bottom of the lining is perforated, and we know has been unused for a long period.
Phil

WeldingRod:
I have a similar pump on garden hose plus cable plus rope that I use to pump out a 65 foot deep pit. I haven't had any issues with it twisting anything up.

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