Installation Manual

Chapter 7 N40475
Page 22
In some cases it is necessary to have a number of
fuel tanks in order to achieve the required operating
range. In such cases, where possible, one tank
should be regarded as the main tank for each engine
and the other tanks should be arranged so that they
will drain into the main tank by gravity. If a gravity
system is not possible, then the system shown in
gure 3 should be used.
Figure 3 shows a collector tank (1), fed by all the
storage tanks and connected to the engine feed (2)
and return systems (3), but with a vent pipe (4) taken
to any convenient tank.
There is no doubt however, that a simple fuel system
as illustrated in gure 1 should be used wherever
possible, as having a completely separate tank and
supply to each engine guarantees that if an engine
stops, due to running out of fuel or to water or foreign
matter in the fuel, the other engine will not be affected
simultaneously. This will give some time for appropriate
manoeuvring action to be taken. The simple system
will also require the minimum number of valves and
ttings, which ensures maximum reliability in service.
Alarm tank
If the engine is equipped with duplex fuel pipes the
sensor in the alarm tank detects if there is a leak in
the inner fuel pipe.
When there is a leak, the fuel will occupy the cavity
between the two fuel pipes and ow down to the alarm
tank and activate the sensor alerting the operator.
Note: Additional monitoring devices are required that
are not incorporated within the ECM.
Figure 3