On Sun, 30 Nov 2003 09:12:00 -0600, "Gene"
wrote:
Problem: Design a pumping system for this rural water well:
- we have a new 240' water well with 6" PVC casing on
some rural ranch land north of Austin, TX
- the screen is set from 140' to the bottom, which was plugged
at 240' (we hit salt water, so we had to cement back up to 240':-(
- good water pushed up to 110' - where it remains
- we have not placed any pump in the well as of yet
- we have 110 & 230VAC next to the well
- the "main problem" is that the well only produces 3 gallons
per minute! So we have to design around this problem.
Our best guess is that the well will constantly produce
3gpm of good water, but that's the best "rate of flow" that
we will ever get.
Here is my first thoughts for a pumping system:
1. Install a high quality small stainless steel submergible pump
and a small pressure tank at the well. Not sure which brand of pump,
size of pump, etc. The idea is to end up with a high quality submergible
pump system that will keep the 3 gpm flowing & last for five or so
years.
2. The submergible set-up above will keep a 2,000 gallon poly
storage tank filled by use of a float switch(s). An above ground "second"
pumping system will deliver a large volume of water as needed to the home,
yard, etc. - up to the amount of water available in the 2,000 gallon tank.
What I need is "SPECIFIC" recommendations as to the pump(s), tanks(s),
float switch(s), etc. I need make, model, etc. data to design this system.
Choosing the
proper horsepower(s), etc. of the pumps is a bit fuzzy for me:-)
I am currently looking at the Grainger catalog number 394 (page 2811)and the
Grainger site for pumps & switches, etc.
Here is the Grainger catalog in PDF:
http://www.grainger.com/Grainger/wwg...p?CatPage=2811
THANKS in advance:-) !!!
Gene
Briggs, TX
I'm assuming you will set the pump at least a 100' in the water and
your driller's recovery estimate is accurate.
My first thought was a 6' Aermotor windmill but it won't lift that
far. An 8' would but it might outrun your recovery in a high wind.
Most 1/2 hp submersible pumps will pump 5 gpm. You would have a 2 gpm
drawdown. Quick calculation shows about 130 gallons in 100' of the 6"
pipe after deducting for the displacement of 1 1/4 " pipe and wire.
That is a little over an hour before the pump is out of water.
Being conservative, I would set a timer for 30 minutes on and 60 off.
That will give you 2400 gallons per day. It won't back flush Barton
Springs but it is 5 times what a normal family uses. You've got the
rest figured out.
One other thing you might look at is at
www.pumpsandtanks.com Look for
Subgard.