HP Generating Set - Manual (Page 17)

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10.2 Remote Fuel Systems
Three types of remote fuel systems are
recommended by the manufacturer:
Fuel System 1: Installations where the bulk fuel
tank is lower than the day tank.
Fuel System 2: Installations where the bulk fuel
tank is higher than the day tank.
Fuel System 4: Installations where fuel must be
pumped from a free standing bulk fuel tank to
the day tank.
Fuel System 1: The bulk fuel tank is lower than the
day tank. With this system the fuel must be pumped
up from the bulk tank to the day tank which is
integrated into the baseframe. See figure 10.1.
Figure 10.1: Typical Layout with Fuel System1
The key components are the bulk fuel tank (item 1),
which is lower than the basetank, remote fuel
system controls (item 2) located in the generator set
control panel, an AC powered electric fuel pump
(item 3), fuel level switches in the basetank (item 4),
an extended vent on the basetank (item 5), the fuel
supply line (item 6), the fuel return line (item 7), and
a fuel strainer (item 8) on the inlet side of the pump.
When set to automatic, the system operates as
follows: low fuel level in the basetank is sensed by
the fuel level sensor. The pump begins to pump
fuel from the bulk tank to the basetank through the
fuel supply line. To help ensure that clean fuel
reaches the engine, fuel from the bulk tank is
strained just prior to the electric fuel pump. When
the basetank is full, as sensed by the fuel level
sensor, the pump stops. If there should be any
overflow of fuel in the basetank, the excess will
drain back into the bulk tank via the return line.
With this system, the basetank must include the
overflow (via the return line), a 1.4 metre extended
vent to prevent overflow through the vent, sealed
fuel level gauges on the basetank and no manual fill
facility All other connections on top of the tank
must be sealed to prevent leakage. Fuel System 1 is
not compatible with the polyethylene fuel tanks
standard on smaller generator sets. The optional
metal tank is required. A 2001 Series control system
(or above) is required.
The position of the bulk fuel tank should take into
account that the maximum suction lift of the fuel
transfer pump is approximately 3 metres and that the
maximum restriction caused by the friction losses in
the return fuel line should not exceed 2 psi.
Fuel System 2: The bulk tank is located higher
than the basetank. With this system the fuel is
gravity fed from the bulk tank to the basetank. See
figure 10.2.
Figure 10.2:Typical Layout with Fuel System 2
The key components are the bulk fuel tank (item 1),
which is higher than the basetank, remote fuel
system controls (item 2) located in the generator set
control panel, a DC motorised fuel valve (item 3),
fuel level switches in the basetank (item 4), an
extended vent/return line (continuous rise) on the
basetank (item 5), the fuel supply line (item 6), a
fuel strainer (item 7) and an isolating valve at the
bulk tank (item 8).
When set to automatic, the system operates as
follows: low fuel level in the basetank is sensed by
the fuel level sensor. The DC motorised valve is
opened and fuel is allowed to flow from the high
level bulk tank to the basetank by the force of
gravity. To help ensure that clean fuel reaches the
engine, fuel from the bulk tank is strained just prior
to the motorised valve. When the basetank is full,
as sensed by the fuel level sensor, the motorised
valve is closed.
Any overflow into the basetank or overpressure in
the basetank will flow back to the bulk tank via the
extended vent.