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WATER PUMPS, TANKS, TESTS, WELLS, REPAIRS
WATER CONTAMINANT LEVELS
WATER HAMMER NOISE DIAGNOSE & CURE
WATER ODORS, CAUSE CURE
WATER PUMP REPAIR GUIDE
WATER PRESSURE LOSS DIAGNOSIS & REPAIR
WATER PUMP SHORT CYCLING
WATER SOFTENERS & CONDITIONERS
WATER TANK REPAIR PROCEDURES
WATER TANK: USES, TROUBLESHOOTING
WATER TESTS, CONTAMINANTS, TREATMENT
WATER TREATMENT EQUIPMENT CHOICES
WELLS CISTERNS & SPRINGS
WELL FLOW RATE
WELL WATER PRESSURE DIAGNOSIS
WELL YIELD IMPROVEMENT
WINTERIZE A BUILDING
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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Diagnosis 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.
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.
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 if you are adjusting, tuning, or replacing the air pressure in your bladder-type well tank.
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Technical Reviewers & References
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