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Well Pump for our Sprinklers.

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Forum topic by Dallas posted 07-21-2014 08:07 PM 411 views 0 times favorited 6 replies Add to Favorites Watch
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Dallas

2906 posts in 1141 days


07-21-2014 08:07 PM

We need to water about 3 acres of the property we work at.
The county supplies our potable water, but to use it for that much irrigation is prohibitive. Last year we were paying $285/mo to water only about 3/4 acre.
We do have 3 old wells, all have 30” cement casings, (yeah, they are old, put in nearly a hundred years ago).
The water level, even though we’re in a 6 year drought is still about 27’ from surface to water level.
The bottom of the wells are about 33’.
Elevation of what needs to be irrigated is around 5’, at most, maybe 6’.
I would be using one or two rainbird type homeowner sprinklers with 1/2” supply tubes.
My hoses are heavy duty 3/4” commercial type hoses, (internal diameter).

I was going to use a 3/4hp centrifugal pump, max 40 psi, min 20 psi with a 98’ head lift. So far I cannot find how far it will lift with suction. I was going to lower the pump into the well, about 5’ higher than the static water level.

This is a pump we have here, rated as a clear water pump with a 1” discharge.

Am I thinking correctly this will work or is there a better ida that isn’t gonna cost a bunch of money? Our new owner won’t OK that right now.

HELP!

-- Improvise.... Adapt...... Overcome!


6 replies so far

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JoeinGa

3244 posts in 661 days


#1 posted 07-21-2014 08:38 PM

You’re at a campground, right? Is there no lake or pond you can pump out of so you dont have to pump up that 30’ lift?

Just thinking out loud here.

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View bigblockyeti's profile

bigblockyeti

1547 posts in 375 days


#2 posted 07-21-2014 09:16 PM

If you’re looking for more than 20’ or so of suction, your best bet is getting a submersible well pump to drop down into the well. They can be had usually for a pretty good deal used. Those who won’t tolerate going without will sometimes replace them before they fail as measure of preventative maintenance. Even if you have a pump that will draw 30’ feet of suction, that ability will be reduced over time as tolerances in the pump open up and trying to prime a pump with that much suction head will take forever. Provided you don’t have super long hose runs, you should be able to run both sprinklers with just the well pump and no booster.

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English

210 posts in 131 days


#3 posted 07-21-2014 10:11 PM

Is the pump you have a well pump? Is it a Jet pump? If it is a jet pump it will work fine if you put the foot valve close to the bottom of the well with 2 lines run from the pump down to the foot valve. Jet Pump uses water pumped down to a foot valve with a venturi, the venturi will pull the water up and can be put much deeper than the theoretical 27’ limit on suction lift.

-- John, Suffolk Virgina

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Grandpa

3133 posts in 1330 days


#4 posted 07-21-2014 11:28 PM

It is never practical to try to suction water more than 22 feet. In a laboratory I believe they say it can be drawn 33 feet but 22 feet is the max you can lift water with a true centrifugal pump. A jet pump will go much deeper but they are not as efficient as a submersible pump. If you use a jet pump you do have to have 2 pipes of different sizes as mentioned above. If you remove the foot valve from the and place the actual valve on a single piece of pipe that is 25 feet long then the pump will not be ruined if the well goes dry. It will save on pipe too, since your water is 27 feet deep and the well is only 33 feet. By doing this the jet pump will continue to circulate the water in the loop but the actual water being drawn can only be 22 feet so the pump doesn’t operate dry. I grew up on a farm with a jet pump and the well did go dry at times. I have a submersible pump today. I worked for a pumping company so I have a little pump and well experience.

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Dallas

2906 posts in 1141 days


#5 posted 07-22-2014 12:29 AM

Thank you gents. The boss has given me permission to spend about $180 for a pump. My thought was to lower the pump to a couple o feet above the static level mounted on a board or two with foam floats in case the water level comes up, (According to the ex-boss it hasn’t since before 1992 when they bought the place).
The pump we have is a centrifugal with an impeller. It will work vertical or horizontal so that is no problem. Head pressure is 98 feet of lift, (no specs on suction so I want to keep it as close to the water as possible).

It is rated for extended run, with a real motor that has external capacitors and is close coupled to the pump. We usually use it for cleaning out one of the rain catch tanks when they get nasty.

-- Improvise.... Adapt...... Overcome!

View hotbyte's profile

hotbyte

185 posts in 1630 days


#6 posted 07-22-2014 12:47 AM

Campground? Tap into everyone’s gray water :) :) :)

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