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7.3 Malte Persson Meg-95 assisted vapour recovery system
As described in the certificate but having assisted vapour recovery system, with or without
system monitoring, schematics of both systems are shown in figures 47 and 48. When the
vapour control electronics detect pulses from one of the pulsers the vapour pump is turned on
and the relevant voltage is supplied to the vapour control valve, controlling the rate of vapour
protection.
The monitoring system is a Gilbarco VMC with a GE1 meter, it checks for the correct
operation of the system, and if after a number of consecutive transactions the system is found
to be functioning incorrectly an alarm system is activated. This indicates to the operator or
owner of the dispenser, that the monitor has detected a fault condition with the vapour recovery
system and the system should be serviced or repaired. The alarm can either be local at the
dispenser (indicating lamp) or can be remotely located in the kiosk area. If, after a certain
period, the dispenser has not been repaired, the appropriate fuelling position will be
automatically disabled until the repair is carried out.
Vapour recovery may be supplied for more than one nozzle. The existing hose is replaced by a
co-axial hose with the vapour line converted to small bore copper or stainless steel pipe at the
connection to fixed pipe. Recovered vapour is returned to the supply tank independent of the
dispenser hydraulics. The gas outlet of the air separation unit must not be connected to the
vapour recovery system.
7.4 Fafnir Vaporix Stage II Vapour Recovery System
As described in the certificate but having assisted vapour recovery system, with or without
system monitoring, a schematics of the monitored system is shown in figure 49. As dispensing
commences the amount of vapour displaced from the vehicle’s tank is sucked through the
vapour recovery pipe work at a rate that matches the flow rate of fuel being dispensed into the
vehicle’s tank. This is achieved by connecting to a single channel of each pulser, using a high
impedance CMOS buffer circuitry to minimise the load on the pulser circuit. This circuitry
then provides buffered outputs for both the flow rate control circuits and the automatic
monitoring system. The Burkett flow control unit takes the buffered flow rate and controls a
proportional valve that restricts the flow of the vapour recovered and also energises the
vacuum pump operation. The monitoring of recovered vapour provides enhancement to the
standard vapour recovery package detailed above. The resulting system is referred to as
“Enhanced Vapour Recovery” or “EVR”.
The Vaporix monitoring unit checks the fuel flow rate from the buffered flow rate unit against
its vapour flow sensor readings. The system is deemed functioning if the volumetric vapour
reading lies between 85% and 115% of the fuel flow rate. If for 10 consecutive transactions the
reading is outside this range then the monitor will alert the operator at the kiosk or locally at
the dispenser.
After seven days, if the unit has not been serviced by an authorised engineer the Vaporix
monitor unit will disable the dispenser by disconnecting the appropriate pulser power supply
connection. The calculator will immediately detect a pulser error status and prevent any further
dispensing. The communications to the kiosk is achieved by implementation of an IFSF LON
protocol interface unit.
(98 paginas)
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