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3.5.2 Cooling and lubricating oil system
Description
Oil from the oil sump (OS) of gear casing (GC) is
circulated by an oil pump (OP), mounted on the front
of the gear casing. The pump is driven from the main
drive shaft. The oil is pumped to the MP compressor
element (CE
MP
), the HP compressor element (CE
HP
)
and the LP compressor element (CE
LP
) respectively,
and from there through the air-cooled oil cooler (OC).
From the oil cooler (OC) the oil passes through the oil
filter (OF
C
) on the gear casing before entering the LP,
MP and HP element oil pipes and ducts to lubricate
the rotor bearings, driving and timing gears. The oil
then flows back to the oil drains, to the oil sump.
The gear casing is vented to the atmosphere through a
breather pot assembly.
The bypass valve (BV
OF
) of the oil filter opens when
the pressure drop over the filter is above normal due
to clogging of the element. The oil is then circulated
without being filtered. For this reason, it is imperative
to replace the oil filter at regular intervals.
Bypass valve (BV
OS
) opens when the pressure drop
over the filter and lubricating circuit is above normal.
The oil is then returned to the oil sump.
Bypass valve (BV
OC
) opens when the pressure rise
over the oil cooler is above normal. This will happen
mainly when starting the compressor from cold in low
ambient temperatures. The bypassing of the oil cooler
will ensure rapid warming of the oil to the normal
working temperature.
A pressure and temperature sensor are comprised in
the system.
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