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AALBORG
OIL SYSTEM " OM5560 96#A.2
,INDUSTRIES
I I -
Oil System
1
21-36/60
Fuel oil system
This section describes the oil system in general terms together with some
of
the re-
quirements needed to have a safe and reliable burner operation. The flow diagram
of
the oil system is shown in another chapter.
The oil system is fitted with one set
of
supply oil pumps common for both
DO
and
HFO. The fuel type
is
selected by manually operating a three-way valve in the oil
system.
The oil system consists
of
oil tanks for
DO
and HFO, mixing tube, oil pumps and
pressure regulating valve, and a pre-heater at the burner unit.An orifice
is
fitted at the
pre-heater in order to limit return flow through the pre-heater, when the burner
is
stop-
ped.
The heavy fuel oil tank may
be,
provided with a heating coil for heating up the fuel oil
in the tank to a viscosity between 60 cSt and 380 cSt.
Whenever a boiler plant
is
intended to operate 'on heavy fuel oil, all pipes carrying fuel
oil must be insulated and traced in order to keep a sufficiently low viscosity
of
the oil.
The tracing can be done either by means
of
steam heating or by means
of
electric
heating cables. The tracing
is
to be controlled.
The pumping capacities for the pumps must be calculated
in
such a way that there will
be sufficient oil flow to the burner, and the pressure regulating valve in full load con-
dition.
In general it
is
recommended that the pipe lines to and from the fuel oil supply'pumps
are dimensioned so that the velocities inside the suction and return pipes do not exceed
0.5 mls and so that the velocity inside the pressure pipe does not exceed
1.0
m/s.
The control system automatically start the stand-by oil pump and stop the other oil
pump
if
the pressure drops below the pre-adjusted set point. The signal for low pressure
comes from a pressure transmitter on the burner
The ignition burner
is
electrical. This secures a reliable ignition.
Language
UK
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