How to Replace the Bladder in a Water Pressure Tank

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A pressure tank with an internal bladder is an effective way to provide water within a plumbing system. When a faucet is opened, the pressure in the tank forces water from the bladder, rather than the pump immediately engaging and running constantly. The pump runs only to refill the tank to a given pressure.


A pump cycling on and off too frequently or low water pressure problems may be the result of a failed bladder in the water pressure tank. In this case, the bladder will need to be replaced.

Things You'll Need

  • Socket wrench
  • Replacement tank bladder
  • Turn off the water main and disconnect electrical power from the pump.

  • Open the closest faucet to the tank to drain it and release pressure within the system.

  • Disconnect the tank from the plumbing system and drain all remaining water from the tank.

  • Remove the nuts holding the cover flange in place. Remove the cover flange.

  • Remove the damaged bladder. Break the seal of the bladder rim from the edge of the tank and pull it through the opening.

  • Install the new bladder by carefully rolling it and slipping in through the opening in the tank.

  • Fit the rim of the bladder snugly to the edge of the tank opening.

  • Replace the cover flange, ensuring that it does not bind against the bladder rim, damaging it.

  • Replace the nuts to hold the flange in place. Be careful not to go overtighten them and damage the flange.

  • Remove the air valve cap and charge the tank to the proper pressure. Check for leaks around the flange. Replace the air valve cap.

  • Reinstall the tank in the plumbing system. Turn the water main on and reconnect power to the pump. Observe the new installation for any leaks.

References

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