I need to install a new submersible well pump. My well delivers about 3 gpm
but pump is about 60 feet below water level. My 35 gal. bladder type tank
has a 12 gal. drawdown set for 20/40 lbs.
Should I pay more for a 5gpm pump instead of buying a standard10 gpm pump? I
have an electronic sensor to turn off the pump if it sucks air.
Thanks for you insite to this question.
That is not how you size a pump. You calculate the total dynamic head at
the pressure you want to use and then select the hp to do the job. Start
yer lernin' here:
A 6" well has 1.47 gal per foot of water. Your 10 gpm pump moves what
water it can based on the head and the water level in the well and then
your 3-5 gpm recovery is added to the well (per minute), so you really
have to use a lot of water to have a problem. The gpm rating of a pump
is all about the TDH. A 1/2 hp 10 gpm is probably what you had and will
work just fine as long as you aren't at a couple 1000' or more above sea
Quality Water Associates
Thanks for the education on TDH and pump curves. In all the pump literature
put out with the submersible pumps never have a pump curve chart. Their only
chart shows a low yield pump pumping less water at 20' but more water than a
normal pump at say 150'. For my use on their chart the normal, 10 gpm, will
pump 8.6 gpm at 40# from 100', which is about what I need. I now know not to
spend extra for the low yield pumps which I don't need.
Thanks again guys. Henry
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