ZombieBeaver
New Member
Single family home. No kids, but we water various animals each day.
We had a new 400' 6" well drilled and installer installed a Goulds 7gs10 pump with 1hp motor simply due to installation depth of 380'. Now that well has settled in over 4 months or so we understand the true nature of the well. It is a flowing artesian with 1.2 GPM out the top and positive pressure at the cap of 10 psi. Well recharge at the bottom was estimated at 9.5 GPM when drilled.
Pressure tank is a wx-205 running 30/50, no CSV.
Since well is typically completely full of water and under 10 psi of pressure with a sealed cap, the pump which is supposed to run 2 to 10 GPM is filling my 10 gallon well tank in 30 seconds (20gpm!) Installer claims it's fine no problem and doesn't want to deal with me. To prevent overcurrent, reduce upthrust, and increase run time, I installed a 10 GPM Dole valve before the pressure tank to throttle the pump back so now I have one minute fill.
I'm trying to determine my best course of action, and was considering some combination of the following:
- Replace pump with a Red Jacket 6S25 (seems better sized for the situation)
- replace pressure tank with larger wx-251 for double volume.
- install CSV
Any initial opinions? Either way I'm losing money on something. They won't take the pump back or admit it's not size properly for the application. If I hadn't installed the dole valve I'd still be flowing 20 GPM with a 30 second run time.
EDIT: additionally I'm worried about throttling the pump back even further. From the pump curves it seems to me I'd have about 178 PSI of line pressure if the CSV were to throttle back to two GPM. The line is 35 years old and is already seeping a bit at the fitting where it enters the basement due to the Dole valve I had already installed...
EDIT2: after running all calcs including pressure loss in pipe and fittings etc I arrive at my best and worst case scenarios of 90 ft head (BEST) and 525 ft head respectively (WORST assuming I actually drew the well down to near the level of the pump, which I believe is probably unlikely). No pump can handle such a wide range and stay in it's ideal operating region without some creative restricting going on.
We had a new 400' 6" well drilled and installer installed a Goulds 7gs10 pump with 1hp motor simply due to installation depth of 380'. Now that well has settled in over 4 months or so we understand the true nature of the well. It is a flowing artesian with 1.2 GPM out the top and positive pressure at the cap of 10 psi. Well recharge at the bottom was estimated at 9.5 GPM when drilled.
Pressure tank is a wx-205 running 30/50, no CSV.
Since well is typically completely full of water and under 10 psi of pressure with a sealed cap, the pump which is supposed to run 2 to 10 GPM is filling my 10 gallon well tank in 30 seconds (20gpm!) Installer claims it's fine no problem and doesn't want to deal with me. To prevent overcurrent, reduce upthrust, and increase run time, I installed a 10 GPM Dole valve before the pressure tank to throttle the pump back so now I have one minute fill.
I'm trying to determine my best course of action, and was considering some combination of the following:
- Replace pump with a Red Jacket 6S25 (seems better sized for the situation)
- replace pressure tank with larger wx-251 for double volume.
- install CSV
Any initial opinions? Either way I'm losing money on something. They won't take the pump back or admit it's not size properly for the application. If I hadn't installed the dole valve I'd still be flowing 20 GPM with a 30 second run time.
EDIT: additionally I'm worried about throttling the pump back even further. From the pump curves it seems to me I'd have about 178 PSI of line pressure if the CSV were to throttle back to two GPM. The line is 35 years old and is already seeping a bit at the fitting where it enters the basement due to the Dole valve I had already installed...
EDIT2: after running all calcs including pressure loss in pipe and fittings etc I arrive at my best and worst case scenarios of 90 ft head (BEST) and 525 ft head respectively (WORST assuming I actually drew the well down to near the level of the pump, which I believe is probably unlikely). No pump can handle such a wide range and stay in it's ideal operating region without some creative restricting going on.
Last edited: