Pre-Charging Of The Bladder - Freudenberg BA 15-B02 000/18 Instrucciones De Operación

5.3. Pre-charging of the bladder

Before commissioning, the pre-charge pressure of the bladder accumulator must be checked and filled if
necessary.
Freudenberg offers filling and testing devices in various designs. With these a safe test and if necessary a change
of the gas pre-charge pressure is possible. A detailed description of the procedure is included in the operating
instructions of the respective device.
The most important steps in charging a bladder accumulators are:
•
Ensure system-side pressure relief.
•
Remove the outer protective cap and the inner valve cap at the bladder accumulators gas port.
•
Assembly of the filling and testing device on the gas valve body of the bladder accumulator.
(Detailed procedure can be found in the operating manual of the filling device)
•
Connect the nitrogen line to the gas inlet of the filling and testing device.
(Detailed procedure can be found in the operating manual of the filling device)
DANGER: Bladder accumulators must only be filled with Class 4.0 nitrogen (N2-Vol.%> 99.9).
WARNING: The pressure set on the pressure reducing valve must not exceed the max. permissible
operating pressure of the accumulator.
•
Carefully open the shut-off valve of the nitrogen line in a way that at the beginning the pre-charge pressure
of the accumulator increases very slowly in order to let the bubble adapt with the inner wall of the vessel.
•
Fill the bladder with continuous monitoring of the pressure gauge until the required pre-charge pressure is
reached.
•
Close the shut-off valve of the nitrogen line.
•
Wait until there is no detectable pressure drop due to the gas
temperature compensation.
•
Check the actual pre-charge pressure. If necessary, refill/drain nitrogen
and correct the pre-charge up to its nominal value.
•
Disassembly of the filling and testing device from the gas valve body of
the bladder accumulator.
(Detailed procedure can be found in the operating manual of the filling device)
•
Check for nitrogen leakage at the gas valve.
•
Screw on and tighten the valve cap.
•
Mount the protective cap on the gas connection of the accumulator.
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