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B) Connection diagram, refueling with only one filling line (without flowback line)
B1) Connection diagram for single bag tanks
This variant is used for bag tanks. As soon as the tank is full, the pressure in the tank will rise and fuel
flow will drop slightly.
This circumstance is recognized by the system and evaluated as a "tank full" signal.
In this configuration, the flowback line is not used/analyzed!
Flow
Sensor
Pump
Fuel detector
Fuel detector
Fuelstation
to engine
/zur Turbine
Model
Bladder-tank
/Beuteltank
Flowback line / Rücklauf
Fuel supply line
Kraftstoffversorgung
Fill-line
/Befüll-Leitung
Fuel container
/Kraftstoffreservoir
This results in the following filling cycle:
Fuel is first filled into the bag tank from the blue filling hose. If the bag is full, the pressure in the bag will
increase and at the same time the fuel flow will drop slightly. This circumstance is recognized by the
control of the fuel station and evaluated as a "tank full" signal. There is now an automatic drawback of
fuel and/or air bubbles into the fuel station/fuel container. Should the situation arise, aspirated air
bubbles are detected by the detector in the fuel station. Only when "bubble-free" fuel is sucked in (and
detected), is it ensured that all air has been removed from the bag tank. If necessary, the system
performs a second fill/drawback cycle to remove all air bubbles from the bag tank.
Once the air bubbles have been removed, the tank is completely refilled and then emptied by a defined
volume (decompression).
You then have a full bag tank without overpressure.