Lubricating oil system
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2.08
, Gas
0915 BC
If possible, elbows in the piping system are to be
avoided. Equivalent length of straight pipe for
various elbows, if required, to be found in literature.
Filtration
The main lubricating oil filter for all Bergen engines
is designed for full flow and is of the duplex type.
Filter elements can be replaced during running of
the engine, due to that each of the filter columns are
designed for full flow.
The remaining operational parameters to be found
in enclosed table 1
99% of particles with diameter of 20-30 micron or
larger will be retained in a new filter cartridge. After
a few seconds, however, particles with diameter of
7-10 micron will be retained in the filter.
The cartridges should be changed when the
pressure loss in the filter is 1,5 bar.
Alarm for high diff. pressure over the filter is
required, and the engine is stopped automatically at
a diff. pressure of 2,5 bar.
In addition to the above main filter the lubr. oil
system is equipped with a partial flow centrifugal fil-
ter, with capacity of max. 10% of total lubr oil flow.
Thermostatic Valve
The engines are as standard equipped with thermo-
static valve of the wax element type, with a fixed
temperature range of 54 - 63°C for mixing applica-
tion.
For optimal temperature control, the pressure loss in
the valve should be 0,14 - 0,5 bar.
The valve is normally operating in automatic mode,
however in emergency cases each of the valve
elements are fitted with a variable manual override
which allows the valve to be progressively forced to
full cooling position.
Oil mist detection system
For immediate action in case of an overheated main-
or big end bearing, the engine is equipped with au-
tomatic shut down for high oil mist concentration in
the crankcase. A small amount of crankcase atmos-
phere is continuously extracted and led to a surveil-
lance unit called an Oil Mist Detector.
Lubricating Oil Cooler
A plate heat exchanger with stainless steel plates is
the standard lubricating oil cooler for fresh/sea
water respectively. The lubricating oil cooler is
mounted off engine. When the engine is resiliently
mounted, expansion bellow(s) are to be fitted
between external pipes and engine.
Please note that external pipes are to be thoroughly
rust pickled, acid cleaned, and kept completely
sealed until finally installed onboard. Prior to initial
start of engine, flushing of the external pipes are
compulsory. Flushing procedure to be executed in
accordance with RREB practice.
Press. loss in such a cooler (FW / SW-side) is normally
0,3 - 0,5 bar and should be limited to 0,6 bar.
Max. pressure loss on lubricating oil side is 0.8 bar
The lubricating oil cooler is designed for removing
heat output from the engine.
For other lubricating oil cooler parameters, please
see Part 1.04 Technical data.
Fluid Type Lubricating Oil – SAE 40
Lubricating oil minimum temperature ºC 15
Lubricating oil working temperature ºC 60
Lubricating Oil max. design temperature ºC 100
Filtration rating filter cartridge micron 15 nominal
Filtration Efficiency % 90% at > 16 µ and 98% at > 20 µ
Working pressure bar 5
Design pressure bar 10
Minimum test pressure filter housing bar 15
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