Pressure Tank Problems - Plumbing - DIY Home Improvement | DIYChatroom
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing


CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Like Tree1Likes
  • 1 Post By jmon
Reply
 
Thread Tools Display Modes
Old 09-07-2016, 04:04 PM   #1
Newbie
 
Join Date: Sep 2016
Posts: 1
Rewards Points: 2
Default

pressure tank problems


My well pump keeps short cycling, it goes from 30 to 50 psi in about 5 seconds after only letting out about 2 gallons of water. Yet the tank air pressure is holding at about 28 psi. I checked this by killing the power, emptying the tank via the hose bib, then checking air pressure. I even tried letting all the air out of the tank then blowing it back up to 28 psi. So today I replaced the 23 year old pressure switch and gauge and did the same test. Same results.
HOWEVER this time after the pressure switch hit 50 psi I heard a dripping of water from the inside of the tank. Yet the tank is still holding air.
I just don't understand what is going on.
ANY HELP OUT THERE???

Advertisement


Last edited by charlie y; 09-07-2016 at 04:13 PM.
charlie y is offline   Reply With Quote
Old 09-07-2016, 04:50 PM   #2
Member
 
Join Date: Nov 2012
Posts: 3,377
Rewards Points: 318
Default

Re: pressure tank problems


Sounds like the tanks bladder has a rupture in it or scharder valve is leaking. Replace tank would be the next step. Please wait for the plumbers to respond. Thanks.
lenaitch likes this.

Advertisement

jmon is offline   Reply With Quote
Old 09-08-2016, 07:56 AM   #3
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 7,964
Rewards Points: 1,534
Default

Re: pressure tank problems


Even though the tests you performed so far let you conclude that the pressure tank is emptied of water, there may be lots of water somehow trapped in the tank. This detracts from the space available for the air cushion that maintains the system pressure and results in rapid short pump cycling even when the tank can be repressurized normally. Since you cannot see inside the tank to determine the extent of trapped water, either you need to perform several more complex tests, or replace the pressure tank.

This problem can persist with no measurable let alone audible air leakage outside (use soapy water and check for bubbles) and no measurable let alone visible water leakage outside (use toilet paper which shows water stains quickly).

If the pressure tank leaks air or water to the outside it needs to be repaired or replaced with no further questions asked.
__________________
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 09-08-2016 at 08:12 AM.
AllanJ is offline   Reply With Quote
 
Old 09-08-2016, 09:01 AM   #4
Member
 
hkstroud's Avatar
 
Join Date: Mar 2011
Location: Virginia
Posts: 1,020
Rewards Points: 2,030
Default

Re: pressure tank problems


Yes, it sounds like you have a ruptured bladder
.
To properly check for a ruptured bladder.
With the system under pressure, depress the valve stem and let all the air out. Continue holding the valve stem and see if you then get water. If you do you have a ruptured bladder.

To properly set the air charge in a bladder tank you must first completely empty the tank. To simply open a hose bib doesn't do that. The hose bib is usually higher than the tank.
After completely emptying the tank you pressurize it to 2 pounds less than the cut on pressure of the pump switch.

If you have lost the air pressure it is not because of an air leak in the tank. It is because the air (under pressure) is being absorbed by the water.

The dripping you hear is the water moving from the bladder to the tank. The air is between the tank and the bladder. The water is pumped into the bladder.

If you have a ruptured bladder (and you do), you can empty the tank of all water, pressurize it to the proper air pressure. It will then function until the air is again absorbed by the water. How long that will be depends on how much water you use but that will get you by until you can replace the tank.

While draining the tank, pressurize it to push out any water between the bladder and the tank.

Last edited by hkstroud; 09-08-2016 at 09:06 AM.
hkstroud is online now   Reply With Quote
Old 09-08-2016, 10:36 AM   #5
Member
 
Join Date: Sep 2012
Posts: 6,129
Rewards Points: 1,668
Default

Re: pressure tank problems


When you finally determine the tank needs replacing, I believe you'll find the tank to be heavy with water compared to an empty tank.

The experience I've had is there is a pin hole rather than a golf ball size hole and it took several days, weeks or possibly months for the bladder to become water logged so it doesn't drain in minutes even though water quit running from the garden hose.
SeniorSitizen is online now   Reply With Quote
Old 09-11-2016, 09:14 AM   #6
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 7,964
Rewards Points: 1,534
Default

Re: pressure tank problems


If the bladder has only a pinhole in it then the water flow during emptying of the pressure tank is likely to stop short because the bladder hit bottom or herniated into the outlet pipe before all the water got out.

If you let as much of the air as you can out of a bladder tank while the system and pump are still on and you get water out of the air valve then for the reason just above or for a variety of other reasons the system can behave unpredictably until you replace the pressure tank.

A non-bladder pressure tank can be emptied and then all faucets closed and the tank repressurized, and you will get good performance for awhile. You can add air every so often to replace that absorbed by the water if the pump starts running shorter and shorter cycles and then regain good performance.

Advertisement

__________________
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 09-11-2016 at 09:18 AM.
AllanJ is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Well Pump Pressure Problems LTY83 Plumbing 15 06-30-2012 02:58 PM
well pump, pressure tank issue?? fumbrunner Plumbing 2 11-26-2011 08:51 PM
Septic tank missing T and badly angled main line? denemante Plumbing 3 11-22-2011 09:29 AM
Hot Water Tank and Pressure Help tbakbradley Plumbing 2 01-17-2011 09:25 AM
Well Pressure Tank - Maintenance? edro Plumbing 5 12-15-2010 10:23 PM




Top of Page | View New Posts

 

Search Engine Friendly URLs by vBSEO 3.6.1