Marine Installation Manual 2022-03 4-25
4 Ancillary Systems
4.4 Lubricating oil systems
X62DF-S2.0
Full-flow filter
The drain from the filter is to be sized and fitted to allow free flow into the lubri-
cating oil drain tank.
The output required for the main lubricating oil pump to ‘back-flush’ the filter
without interrupting the flow is to be taken into account when estimating the
pump capacity (see Lubricating oil pump,  4-24).
Booster pump for
crosshead lubrication
Type
a)
a) Optional: changeover duplex filter designed for in-service cleaning, with differential pressure gauge
and high-differential pressure alarm contacts
Automatic back-flushing filter with differential pressure
gauge and high-differential pressure alarm contacts.
Designed to clean itself automatically using reverse flow
or compressed air techniques.
Back-flushing oil treatment by sludge checker.
Oil flow Refer to GTD.
Working viscosity 95 cSt, at working temperature
Working pressure 6bar
Test pressure Specified by classification society
Diff. pressure, clean filter Max. 0.2 bar
Diff. pressure, dirty filter Max. 0.6 bar
Diff. pressure, alarm Max. 0.8bar
Note: Real operational settings could be less according to
filter maker’s recommendation.
Mesh size Sphere passing max. 0.035 mm
Filter material Stainless steel mesh
Filter inserts bursting press. Max. 3 bar differential across filter
Type Positive displacement screw or gear types with built-in
safety valves
Capacity According to GTD: The flow rate is to be within a tolerance
of 0 to 10 % of the GTD value.
Delivery head Refer to GTD.
Working temperature Approx. 45 °C
Oil type SAE 30, 95 cSt at working temperature; when sizing the
pump motor the maximum viscosity to be allowed for is
400cSt.
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