OPERATING AND MAINTENANCE MANUAL
EPDM TANKS
3. OPERATION
Drinking water collected from the mains, from a tank, etc., is pumped to the storage tank by
the pumping unit.
As water enters the tank, it is stored inside the bladder or membrane, which hermetically
separates the air and water chambers. As water enters the tank, the initial volume of captive
air in the tank decreases and consequently the pressure increases.
When the maximum desired pressure is reached (pump stop pressure), the pressure switch
cuts off the current and the water circulation between the pump and the tank is interrupted
at this moment. At this moment there will be a volume of water stored inside the tank at a
pressure equal to the pump stop pressure.
Depending on the needs and demand of the users, the energy stored through the captive
air inside the tank will propel the water contained inside the bladder to the consumption
points. As a consequence of the demand and the different inputs from the accumulator to
the system, the tank bladder containing the water is emptied and as a consequence, the
air pressure decreases. As soon as the pressure drops below the pressure at which the
pressure switch is set (pump start pressure), the booster set will start up at that moment,
supplying the necessary water according to the needs of the moment and also refilling the
tank, restoring normal working conditions.
As long as the chamber air pressure is maintained, the cycle runs automatically, as many
times as the maximum and minimum pressures are reached. It is therefore essential to
implement and carry out a periodic check and maintenance of the tank air charge pressure.
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