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7.2 Nuovo Pignone vapour recovery system RV-01 - open frame version and
explosion proof version
7.2.1 Description
As described in the certificate but having an assisted vapour recovery system. 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
extraction. These electronics and valves are common to each system. A schematic of each
system is shown in Figures 44, 45 and 46.
Vapour recovery may be supplied for each grade of fuel. The existing hose is replaced by a
co-axial hose with the vapour line converted to small steel or plastic pipe at the connection to
fixed pipe. The nozzle is replaced by a vapour recovery nozzle that incorporates an annulus
vapour duct. Recovered vapour is returned to the supply tank independent of the dispenser
hydraulics via a non-return valve.
The gas outlet of the air separation unit must not be connected to the vapour recovery system.
The vapour recovery module used may be one of two types, an open frame version (Figure 41)
for installation in non-explosive areas, or an explosion proof version (Figure 42) for use in
explosive areas. Both versions may be connected to the pulse output from the pulser via a
junction box or to a pulser output from a magnetic encoder (Figure 3) mounted on the meter
shaft.
This approval does not permit the connection of the vapour recovery module directly to the
calculator.
NOTE: For each dispenser types the hazardous and non hazardous areas are defined by the
safety certification documents. This documentation specifies where each component of the
vapour recovery system may be installed.
7.2.2 Components
The vapour recovery system comprises of the following main components:
Manufacturer Description Model No:
Nuovo Pignone vapour recovery control module
Open frame version TSO91033-34
Explosion proof version TSO91030-31
Nuovo Pignone Power supply board TSO31086
Nuovo Pignone magnetic encoder SWITCH MZ94
Nuovo Pignone vacuum pump motor NFB459001061
(filter on suction side as an option) (or similar model)
(98 paginas)
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