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Applications / Pumping from a Cistern
« on: July 20, 2020, 12:54:28 PM »
Hi, I’m new to the forum after lurking for some time. I spoke with someone very helpful in your office last week – Sam – but have a few follow-up questions I wanted to post and thought it might prove useful to others who may encounter a similar situation. After a couple of failed attempts with low producing wells, I am having a spring developed that produces ~7gpm. This spring will be feeding a 1200-gallon cistern buried a few feet below the source of the spring. I purchased a Hallmark Industries MA0414X-7A [230V 2-wire] submersible pump. Pump will be mounted in a 4” flow inducer sleeve and mounted horizontally on top of two 4” PVC pipes as I’ve seen pictured elsewhere here on your forum.
This set-up, initially, will be supplying a single-story home located ~70 feet above the cistern, with a horizontal distance of [I’m guessing] 350 feet. The person developing the spring and installing the tank is burying 1½” PVC and 10-3 wire. I could’ve used 10-2 but I didn’t know at the time what pump I would be using. I want to use the PK1A Pressure Tank Kit with the 10-gallon tank, 40-60 pressure switch, with the CSV setting of 50psi. The pressure tank and CSV will be located at the house, and not at the cistern so that I can weather/critter-proof them.
Most of the discussions posted here relate to using wells as the water supply, so I’m not sure how things like maximum head and backpressure come into play when pumping from a cistern. Could you comment on this set up? Also, I’ll need to install a 1¼” nipple, check valve, and 90* elbow on the pump, and I’m curious what you used in your example picture [the one with the horizontal installation] – brass, stainless, galvanized? On the flow inducer sleeve, would 4” pipe give enough flow around the motor for cooling? My pump is listed as having a max diameter of 3.8”, but I think that includes the bump out for the wiring. Is SDR35 safe for drinking water or would you use PVC in that case? Do you use or recommend anything to center the pump in the sleeve, such as bolts spaced at 120*? Anything else I should be concerned about?
Thanks in advance,
MikeInTN
This set-up, initially, will be supplying a single-story home located ~70 feet above the cistern, with a horizontal distance of [I’m guessing] 350 feet. The person developing the spring and installing the tank is burying 1½” PVC and 10-3 wire. I could’ve used 10-2 but I didn’t know at the time what pump I would be using. I want to use the PK1A Pressure Tank Kit with the 10-gallon tank, 40-60 pressure switch, with the CSV setting of 50psi. The pressure tank and CSV will be located at the house, and not at the cistern so that I can weather/critter-proof them.
Most of the discussions posted here relate to using wells as the water supply, so I’m not sure how things like maximum head and backpressure come into play when pumping from a cistern. Could you comment on this set up? Also, I’ll need to install a 1¼” nipple, check valve, and 90* elbow on the pump, and I’m curious what you used in your example picture [the one with the horizontal installation] – brass, stainless, galvanized? On the flow inducer sleeve, would 4” pipe give enough flow around the motor for cooling? My pump is listed as having a max diameter of 3.8”, but I think that includes the bump out for the wiring. Is SDR35 safe for drinking water or would you use PVC in that case? Do you use or recommend anything to center the pump in the sleeve, such as bolts spaced at 120*? Anything else I should be concerned about?
Thanks in advance,
MikeInTN