Maintenance and repair of the pressure tank

Maintenance of the pressure tank:

• Monthly check of the pump's on and off pressure to match the values set during calibration.
• Every six months, check the external damage of the pressure tank for corrosion, dents, and leaks. If external damage is found, the cause must be identified and rectified.
• Every six months, check the initial gas space pressure Pг to ensure it corresponds to the calculated value. You can calculate the initial gas space pressure in the site section Calculations.
• Every six months, check the integrity of the membrane, and if any damage is found, replace it.
• If the pressure tank is not used for an extended period, it should be stored in a dry place after draining all the water from it.

Checking the initial gas space pressure in the pressure tank. To check the initial gas space pressure, disconnect the tank from the water supply system, drain the water from it, and connect a pressure gauge to the gas space nipple. If the pressure is lower than that set during calibration, the tank must be pressurized with a compressor (possibly a car compressor) through the same nipple.

Checking the on and off pressure of the pump. The pump's on and off pressure is measured with a gauge installed on the pressure tank. For this, you need to open any faucet for water supply and record the pressure value at the moment the pump turns on. The off pressure is recorded after closing the faucet and turning off the pump.

Possible malfunctions of the pressure tank

Repair of the pressure tank with a torn membrane. To identify a torn membrane, it is necessary to disconnect the tank from the water supply system and drain the water. If air escapes from the drainage valve, it means that the membrane's integrity is compromised.

A torn membrane should be replaced if it is replaceable. It is not recommended to glue the membrane, as most adhesives are not suitable for use with potable water, and the cyclical stretching-compressing of the membrane, which occurs several times an hour, is destructive to glued joints.

Procedure for replacing the membrane

• Disconnect the pressure tank from the water supply system and drain the water.
• Release the pressure in the gas space through the nipple at the top of the tank.
• Dismantle the membrane flange located in the area of the pipe connection flange. Unscrewing the nut at the top of the housing (if present), release the membrane holder.
• Remove the membrane from the opening at the bottom of the housing.
• Check the inner surface of the housing for dirt and corrosion. If present, remove them and rinse the surface with water. After that, dry the pressure tank's housing.
• Remember that the membrane is not oil-resistant, so oil-containing substances should not be used for anticorrosion protection of the inner surface of the housing.
• Insert the membrane holder into the opening at the top of the membrane being installed (if the fastening is provided by the tank's design). Screw the bolt into the membrane holder, insert the membrane into the housing, and insert the holder into the opening at the bottom of the housing. Secure the membrane holder with a nut.
• Assemble the membrane flange onto the housing.
• Set the pre-pressure in the pressure tank. Check for leaks and reconnect the pressure tank to the system.

Attention!

Replacement of parts is allowed only with original spare parts from the tank manufacturer.

It is best to fill the air chamber with an inert gas, such as nitrogen.

Before removing gas from the air chamber, the water must be drained from the tank.

The service life of the pressure tank decreases under maximum pressure values and outside the specified temperature range.

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