We bought an old vineyard that has an existing well & irrigation system. There is a 3" pipe that comes up from the well at an angle. This leads into a vertical pipe which has a screen which then goes down into the ground and tees North and South supplying the entire vineyard. There is no pressure switch, tank, or any control system whatsoever other than a SPDT switch to power the pump. There are valves throughout the property along the mainline which turns off certain sections of the vineyard. The pressure gauge we installed on an existing garden hose valve shows 10PSI when the pump is running, though the irrigation system's drip lines have leaks all over the place. This vineyard is very old.
We're wanting to do other types of farming on this land as well as build a house and barn with normal water pressure. We don't like the manual method of turning the pump on and off and would like to have a pressure switch at least with possibly a tank, however most tee setups we see for pressurized systems are not for 3" pipe.
Can we "tap & thread" The components of a pressure system into this 3" pipe (pressure switch, gauge, pressure relief valve, maybe a good-sized pressure tank) to create the same result of the pump switching on when one of the valves get opened? The entire system provides irrigation for over 100 acres, so getting rid of the 3" pipe isn't an option...the high volume is necessary (I think).
There is also a valve coming off the pipe as seen in the photo. Could we maybe put a pressure tee there with the outlet capped? or does it need to feed back into the main pipe?
We thought about putting in a 2500 gallon tank with an auto-fill-shutoff valve and then having a second pump with a pressurization setup to supply pressurized water, but that still means someone has to physically activate the pump to make sure the 2500 gal tank doesn't go dry.
What is the best approach to get pressurized water from this well while still serving the irrigation needs of the farm?