shared well, neighbors ose pressure

From:
http://www.irrigationtutorials.com/formulas.htm#sec4

Feet head (of water) x .433 = Pounds per square inch (PSI)

So working it backwards based on the gauge reading = feet of water or elevation, no?

When they run out of water, you see 27 lbs on the gauge meaning, the pump should have come on at 47 and didn't. You also say they get water back at 53 psi. So IMO you need to shut off the water to their house. Then change the switch settings to 57/77 and set the captive air precharge in each tank at 60 psi with no water in the tanks. The 60 psi is to compensate for when the hot air from your compressor cools in the two (large) tanks. Recheck the air psi in 10-15 minutes and get it to the right psi of 56-55 psi with no water in the tanks. That way their water doesn't stop flowing before the tanks empty and pump comes on. If you don't get this right before looking for other causes, you have no idea if the system is working right.

The above psi settings are due to the pressure loss in elevation to their fixtures OR some intermittent blockage in the line to their house. That could be a valve washer in a valve in their house that has come loose and it flops around at times to reduce flow. Which takes at least 53 psi to dislodge it again. Or a slug of rust etc..

Now if their house is level with the gauge or below it, forget the elevation stuff.

And when you reset the air pressure and switch settings....spend the $5 for a new gauge!!! I'd never come out to your place for this type problem and rely on an old gauge!

Or you get to keep assuming the old one is good when it may be wrong and there isn't 27 psi when their water quits and you keep chasing your tail and changing air psi and switch settings.... And they are still out of water at times.

At times may be due to the water level in the well being low due to you or they using water prior to when they run out AND a worn pump tha tcan't keep up.

So one more time... How much elevation from the pressure gauge to their highest fixture?
 
Shared well!

I'm a MGWC (Master Ground Water Consultant) known as a Green Jacket in the water well industry!
Keep in mind when you're doing all the manual labor, everyone (including myself) is a consultant.

If the line to the elevated home has a 40 plus year old galvanized pipe, I suspect that is the main problem. Replacing the line may help but I'll make a better solution.

SOLUTION: Install another 1/2 hp shallow well jet pump and hydrodynamic tank at the elevated house. Install the suction line of the elevated pump to the water line from the lower tank (with a check valve). Install a Cycle Stop Valve, model CSV-150 Valve www.cyclestopvalves.com on the elevated tank. The pressure switch line must be relocated from the pump to the outlet of the tank. Set the pressure switch to 40 psi on and 60 psi off. This will give the people in the elevated home a constant 50 psi (like city water pressure).

Then reset your pressure switch to 40/60 and install a CSV-150 cycle stop valve on your tank. You can remove one of your tanks if you like. Likewise when installing a CSV, if it's a jet pump, you must move the pressure switch line to near the tank.

This may seem quite elaborate but it's really quite simple and I promise it'll work great for both homes!

OPTION: Go to www.cyclestopvalves.com and look up their 800#, call them and they will walk you through the whole installation at no cost.
 
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