Dual Submersible install [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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Ron,

Thanks for your additional input. I called Nick on the phone and yes, 
he is using suitable poly pipe for the hand-installation. He has an 
junk diaphragm submersible in the back that he will send down as a 
"dummy" to test for clearance. I also suggested he has the customer run 
his AC pump for some time so that when he pulls the dummy up, he will 
also be able to find the drawdown level by feeling where the rope gets 
wet. Knowing that, he won't be likely to put the new pump down way 
lower than necessary (risking a snag).

I urge anyone on the list to consider installations like this "well" in 
advance. You may wish to download the instruction manual for ETAPUMP or 
ETAPUMP Mini from www.dankoffsolar.com (they are the same in terms of 
installation details). Regardless of what solar pump you may consider, 
our manual will give you details and precautions about double-pump and 
other unusual installations, including connection of the pump to the 
intake (bottom) of a windmill cylinder, plus hand installation details, 
pitless adapters, etc.

We give details about double pumps because retaining an existing AC 
pump is an economical way to provide a completely independent backup 
system, or the possibility to pump greater amounts of water in case of 
construction, fire, accidental water loss, etc. Besides, customers 
don't like to be told to discard a "perfectly good" AC pump. Also, some 
people install 2 solar submersibles, if 1 is not enough, using the same 
double-sub concept.

And Ron, we agree about 2 pitless adapters being the best way to go, 
with pumps hanging (and piped) independently. Just hope there isn't a 
slab poured around the casing! In Nick's case, there is a slab, but 
there's about 8" of casing above it, which is enough to install pitless 
adapters.

It's very unlikely that Nick find a liner in a 4" casing as that would 
be too restrictive for most pumps. It would only be done in order to 
salvage a well with a damaged casing. However, you do bring up a good 
precaution for 2-pump consideration. I have heard of larger casings 
having a transition to a smaller one (or a liner). For example, in 
Colorado, law says the top 20' of the casing must be steel, but below 
that can be plastic. There, they often use plastic 4 or 5", then use 
larger ID only for the top section! The way to check is with a good 
flashlight, or if the sun is out, use a mirror to shine a beam down the 
casing. You can see a long way down that way!

Downward!
Windy

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