Water well pressure set points ?

Low pressure cut in the high pressure cut out psi? Any variation in pressure for shallow well, deep well and submersible pumps ? Variations in pressure for standard pressure tank vs bladder tank ?

Over the years I have found that a 40-60 switch works best with a good sized volume tank.If you ever have to fight a fire until the FD gets there,it will help a lot.

20 psi for cut in and 40 psi for cut out is kinda the normal. usually want 20 psi differential. this keeps pump from cycling on and off to often. can use higher settings also like 40/60 but I wouldn't use it on old pipes. with bladder tanks you are supposed to add air till you come with a few pounds less than cut in pressure. seams like a lot to me. I used to add like 5 lbs of air but maybe that was not enough.

As I understand it, most pressure switches these days come preset at 30/50.

All my pressure tanks are bladder type now. I don't see any difference in operation from when I had an old fashioned tank.

I find the flow drop off, from below 25#PSI very annoying. So I set all my cut in points at at least 25, if not 30. Then cut out at 45 or 50.

Three pumps/tanks are the same, except one is a two line "jet" system on a deep well. I see no difference in operation from that to the two shallow wells.

Most jet pumps will only handle 20-40, 30-50 is pushing it for most jet pumps. I've also set at 15-30 for a small jet pump that would not pump up to 40. I don't think there's much difference between shallow well and deep well jet pumps as far as pressure capabilities. The two pipes to the jet eliminates the depth to water head issue.

Submersible pumps need to be designed based on the pump head and depth to water. If you're 150 ft to water you use up a lot of head to get the water to the surface, about 65 psi in that case. So that submersible pump needs to be able to put up 105 psi at flow rate in order to shut off a 40 psi switch.

I like 40/60 psi. That gives plenty of pressure to run a sprinkler in the garden 200 feet from the house.

As I understand it. 20 psi is normal spread of pressure switches. Most jet pumps are set up for 20-40 switches as 40 is near the top of capability of single stage jets of both shallow and deep well type. However some were or are 2 stage with higher power motors and are usable at higher pressures. Submersible pumps are capable of higher pressures and should be chosen from pump charts giving pressure and volume specs. of pump and power requirements as well as the capacity of the well and flow volume requirements. Also elevation difference between pressure switch and point of use enters in to it as 2.3 feet of elevation is equal to 1 psi. Now to throw another monkey wrench into the works, they are making constant pressure systems that use like a 1 gallon tank and a pressure transducer to control a variable speed motor so the pump only pumps the volume needed to meet the requirements as turn the dish washer on and go take a shower at the same time you probably would not notice a change of pressure as the pump would adjust speed to meet demand as washer reached full and closed the fill valve. I know I'm as clear as mud with my explanation but if you work with it you at least have to have a partial understanding to get a pay check and I've been out of the trade for about 40 years however still have some contact with it.

30-50 is what I use on my shallow well. 33 feet deep. Plenty of pressure in the house.
Richard

I use the recommended 40--60 on my submersible pump

Same here. I upsized the tank, but the switch was 40/60, I replaced it with the same.

You need to get a pressure switch and tank for your situation. I have one well that iam running a 110/90 psi to jet water over a hill and one 30/50 psi that well is on a hill and I have 190psi at the bottom. So you need to figure your elevation, pipe size and use when set up your system

Hello buickanddeere.

I am a bit surprised at your vague question. SO; I would say start with a 30 to 50 pressure, and a bladder tank,

Guido.

(quoted from post at 21:42:53 01/01/19) Hello buickanddeere.

I am a bit surprised at your vague question. SO; I would say start with a 30 to 50 pressure, and a bladder tank,

Guido.

Click to expand...

It is a slow day and I did not want to ask about oil additives , treating diesel fuel for winter or lead substitutes for gasoline. .

We ran 30-50 for many years, New well and the well folk talked me into the more popular by them 40-60.

Fills the sprayer faster, but did cause me some problems with the barn float and some other minor bits to get everything agreeable. The poorer garden hoses swelled up a little more, pinholes a little quicker.

Any well setup should be able to handle either of those two common pressure settings.

Paul

(quoted from post at 00:05:19 01/02/19)

(quoted from post at 21:42:53 01/01/19) Hello buickanddeere.

I am a bit surprised at your vague question. SO; I would say start with a 30 to 50 pressure, and a bladder tank,

Guido.

Click to expand...

It is a slow day and I did not want to ask about oil additives , treating diesel fuel for winter or lead substitutes for gasoline. .

Click to expand...

HA! :lol: :lol: :lol:

(quoted from post at 17:48:46 01/01/19) Low pressure cut in the high pressure cut out psi? Any variation in pressure for shallow well, deep well and submersible pumps ? Variations in pressure for standard pressure tank vs bladder tank ?

Click to expand...

I puzzled over this for many years having had it explained to me numerous times by my friend the well driller and by my pals at the electrical shop that sell me my water system parts. Finally, I got on You Tube and watched some videos on setting the switch and balancing the air tank pressure. Made it all much clearer watching someone do it rather than trying to go from written instructions. My father was one of those guys who could read instructions and "get it" the first time. I don't have that ability at all. I need to see it, read it, probably see it 2 or 3 more times and then make my own notes.

So, long story short- try some You Tube videos from some of the pump and switch people.

I replaced my switch last year with new pump and had to tweek the settings a little, so we don't always know if it was set right from the factory.Also when the cheap guages get old, they tend not to read accurately.I started using oil filled guages and have had good luck with them.It's also a good idea to keep a spare foot valve on hand to take care of surprises that always happen at the wrong time!Good luck!