Bladder type Well X Trol Water Tank (C) Daniel Friedman Water Tank Bladder Problem Diagnosis & Repair
How to replace a burst or stuck water pressure tank internal bladder
     

  • WATER TANK BLADDER REPLACEMENT - CONTENTS: How to repair or replace a water tank with a burst internal bladder. How to diagnose and repair water system problems when an internal bladder water tank is installed. What is the difference between a bladder type water tank and a glass lined no-bladder water tank? Broken, burst, busted or leaky water tank bladders
  • POST a QUESTION or READ FAQs about well water pressure tank internal bladder troubleshooting & repair
  • REFERENCES

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Water pressure tank bladder repairs: this article describes the repair or replacement of internal bladder type water pressure tanks. We explain how a burst or stuck water pressure tank bladder causes water pump and supply troubles and we describe how to fix the problem.

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How do We Repair a Water Tank with a Burst Internal Bladder?

Schematic of a bladder type captive air water pressure tank (C) Carson Dunlop AssociatesDiagnosis of a burst water tank bladder: as we outlined
at WATER TANK BLADDERS & CAPTIVE AIR, if you remove the cap from the air valve on the top of your water tank and depress the pin in the center of the valve, normally air will hiss out.

Don't hold this valve pin down or you'll lose the air charge. But if water comes squirting out of this air valve, the captive-air bladder type water tank has burst or become torn or leaky, and repair is needed.

The illustration at left is courtesy of Carson Dunlop Associates.

[Click to enlarge any image]

A second symptom of burst water tank bladder: if air is found squirting out of plumbing fixtures it's possible that the cause is a burst bladder in the water tank; the tank's air charge is being forced out into the building plumbing system.

A third symptom of burst water tank bladder: if the water tank is full or nearly so and you are unable to drain water out of the tank, a burst bladder may be blocking the tank at its bottom. A burst water tank bladder can collapse at the water tank bottom, preventing water from leaving the tank. The result is no water pressure in the building and perhaps an inability to drain water from the water tank itself.

At WellMate Diagnosis we provide separate water tank diagnosis and repair advice for captive-air water tanks in which the air is in the bladder and the water is outside the bladder in the water tank.

Repair of a leaky or burst water tank bladder: some people recommend treating the water tank as if it were an older bladderless type of water pressure tank such as the tanks we discuss
at STEEL WATER TANKS.

It is unlikely that this will be a satisfactory repair (as you'll see in Kortebein's explanation below). Usually when a captive air water tank bladder ruptures and water enters the rest of the steel tank, the bladder collapses; it often becomes impossible for the water pump to push much water into the water tank, and even if it does, the collapsing bladder will stick to and seal itself so that the water draw-down quantity before the pump needs to run again will be very small.

Fixing or getting rid of a waterlogged collapsed-bladder water tank: as we mentioned above, it's also possible that the torn bladder will stick to the water outlet opening, blocking water from leaving the water tank. The result will be short cycling of the water pump. We discuss water pump short cycling
at WATER TANK REPAIRS. In any case the drawdown volume will be reduced and it's likely that this misused water tank will rust through soon.

Reader Bill Kortebein described how he identified and repaired this problem.

My pump was short cycling like crazy. So I drained the tank, measured the air pressure; it was zero, so I pumped it up to a couple PSI below the cut-in point. Short cycling improved a little…

But in a matter of a couple weeks or so, short cycling was just as terrible again. So I drained the tank again (this time the pipes were disconnected at the bottom of the tank – so I ought to be able to get all the water out, right?). I measured the air pressure: it was back to zero again. Pumped the tank back up again (which forced some more water out). Then tried rocking the tank, and the thing was still practically full, it was almost immovable.

No water ever squirted out the air pressure valve, but…

  • With the pipes open to the air at the bottom of the tank,
  • and the pressure pumped up (38 PSI)
  • I was only able to get a small percentage of the water out of the tank.

The only conclusion I could come to was that the bladder was burst, and that it was lying in a bunch at the bottom and somehow plugging the outlet. [We agree that this is the most probable explanation, though on occasion we've found a water tank outlet blocked by other debris.- DF]

In any case, I replaced the pressure tank (and also installed a cycle-stop valve), and now the pump hardly ever turns on at all, compared to the way it was before.

Since the old tank was practically immovable, someone suggested I drill a hole in the side to let the water out. Pretty good idea, except not with the pressure pumped up to 38 PSI. Once I punctured through, it shot out like to drill a hole in me or anything else in its way, geysered all over the electrical stuff (and tripped the GFCI -- good thing there was one there), and kept me occupied containing this water knife for a good 15 minutes or more).

You need to replace the water tank bladder or as most plumbers recommend, replace the entire water tank assembly. If you are going to drill a hole to drain a blocked water pressure tank, we suggest disconnecting the tank entirely from its fittings and using a hand truck to get the heavy tank outdoors before drilling into it.

Water tank bladder replacement: on some water pressure tanks, the water tank can be disassembled and the bladder replaced. You might want to ask your plumber to try this repair before replacing the entire water tank assembly.

Water tank bladder replacement will involve draining water from the system and removing the water tank pretty much as if the whole tank were to be replaced. Suppliers such as Wessels offer replacement bladders for some models of expansion tanks and hydropneumatic tanks. In general, if you're going to hire a plumber to do this job, we recommend replacing the whole tank.

Water tank bladder air pressure adjustment: Be sure to review WATER TANK BLADDER PRESSURE ADJUSTMENT [link just below] if you are adjusting, tuning, or replacing the air pressure in your bladder-type well tank.

 

 

Continue reading at WATER TANK BLADDER PRESSURE ADJUSTMENT or select a topic from the More Reading links shown below.

Or see WATER TANK BLADDERS & CAPTIVE AIR

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WATER TANK BLADDER REPLACEMENT at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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