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Old 10-17-2012, 09:28 PM   #1
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I think my plumber installed my pressure tank incorrectly.


Hi everyone,

Just want to say I love this site. Here is the problem:
I own a 100 year old home and recently had all new plumbing installed. I also moved my pressure tank from the well house to the basement and had a new main line installed from my well to my house. Every faucet works great with more pressure than I ever have had, but after two to three minutes of running water, the pressure goes to almost nothing, then about 30 seconds later pressure builds back up. Just wondering if the plumbers installed the pressure tank wrong, there is a promblem with the pressure switch, etc. Also, it is a new pressure tank. I went from like a 80 gal. to i think 119 gal. tank. Any thoughts? Thanks.

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Old 10-17-2012, 09:34 PM   #2
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I think my plumber installed my pressure tank incorrectly.


Sounds almost like the hose that goes from the pressure side of the pump to the switch might be partially clogged.


Had this problem before at my own home.

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Old 10-17-2012, 09:44 PM   #3
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I think my plumber installed my pressure tank incorrectly.


I hope there isn't a clog. All the plumbing was installed about three weeks ago. I'm not even living in the home right now due to other renovations. I will try to post a pic tomorrow of how the tank is hooked up, supply lines, etc. to help everyone out. Is there anything else it could be?
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Old 10-17-2012, 09:54 PM   #4
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I think my plumber installed my pressure tank incorrectly.


That's the first thing I would check. Pictures usually help.
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Old 10-17-2012, 11:02 PM   #5
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I think my plumber installed my pressure tank incorrectly.


Could be the pressure tank has no air, or has a broken bladder. That would account for rapid loss of pressure, and when the pump kicks in, rapid rise in pressure. Since you hired a plumber to do the work, you should obviously contact them immediately, since they presumably warrantied their work.
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Old 10-17-2012, 11:30 PM   #6
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I think my plumber installed my pressure tank incorrectly.


What are the on and off pressures when the pump starts and stops? When the system pressure is zero what is the pressure in the tank? It should be 2 psi less than the cut on pressure setting.
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Old 10-18-2012, 11:26 AM   #7
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I think my plumber installed my pressure tank incorrectly.


What's the distance from well house to basement. Seems like you may have a volume problem i.e., new supply line not large enough to keep up to demand. Previously pressure tank at well pushed/forced water through supply line ...now pump and in particular, new line may be having trouble keeping up.

Is it a submersible, deep well pump OR dug well and pump in well house.

Possible kink in line, rock up against it? What size is new line AND how long?
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Old 10-18-2012, 04:56 PM   #8
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I think my plumber installed my pressure tank incorrectly.


It could be that the tank doesn't have enough air pressure. As mentioned above, length (distance from well) and diameter of pipe can make a difference. If it's plastic pipe there shouldn't be any sags in the pipe between the well and pump. Is your pump a "convertible" jet pump or a "shallow well" jet pump? How deep is your well?
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Old 10-18-2012, 07:19 PM   #9
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I think my plumber installed my pressure tank incorrectly.


A mismatch between the precharge in the pressure tank and the low pressure cut in setting on the pressure switch can cause this problem.

As others have posted the precharge in the pressure tank should be 2 psi less than the low pressure cut in setting. So if your pressure switch is 30/50 the precharge in the pressure tank should be 28 psi.

To check the precharge the pressure tank must be emptied of all water and then use an accurate pressure guage to check the air precharge at the shrader fitting at the top of the pressure tank.

You should also confirm the high/low pressure of the pressure switch by observing the pressure guage as the tank is emptied to note the pressure that the pump cuts in and then as the tank fills to note the pressure there the pump is shut off.
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Old 10-18-2012, 09:48 PM   #10
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I think my plumber installed my pressure tank incorrectly.


i think you should check tank pressure in bladder... should be a few pounds lower than cut in pressure........shut off well power and drain holding tank..then ckeck pressure...ben sr
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Old 10-19-2012, 11:03 AM   #11
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I think my plumber installed my pressure tank incorrectly.


Turn off the pump and open an upstairs cold water faucet. Wait for the faucet to stop running.

Now check the pressure in the pressure tank and set it to the 2 PSI below pump turn on pressure.

A pressure tank with no bladder will work (close all faucets before pressurizing with air; repeat the above calibration procedure every 2 months) but a pressure tank with a torn bladder that herniates into the water pipe at the bottom will behave unpredictably.
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Old 10-19-2012, 09:37 PM   #12
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I think my plumber installed my pressure tank incorrectly.


Pulled one apart today that was doing this, and sure enough, the nipple going to the pressure switch was completely clogged.



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