Marine Installation Manual 2022-03 4-78
4 Ancillary Systems
4.7 Fuel oil system
X62DF-S2.0
Duplex filter
The second filter in Arrangement ‘A’ is a duplex filter of recommended max-
imum 25 m abs. A coarser filter is also acceptable. The duplex filter is of manual
cleaning type and is installed in the booster system close to engine inlet. This
filter type is sufficient as most particles are already removed by the 10 m filter as
outlined in Option 1, 4-76 and Option 2, 4-77.
Table 4-13 Specification of duplex filter in booster system
Working viscosity 10-20 cSt required for HFO (13-17 cSt recommended)
Flow rate According to GTD. The capacities cover the needs of the
engine only. If a filter of automatic back-flushing type is in-
stalled, the feed and booster pump capacities must be in-
creased by the quantity needed for back-flushing of the filter.
Service pressure Max. 12 bar at filter inlet
Test pressure Specified by classification society
Permitted differential press.
at 17 and 20 cSt
— clean filter: max. 0.2 bar
— dirty filter: max. 0.6 bar
— alarm setting: max. 0.8bar
Note: Real operational settings could be less according to
filter maker’s recommendation.
Minimum bursting press.
of filter insert
Max. 3 bar differential across filter
Mesh size Max. 25 m abs.
Filter insert material Stainless steel mesh (CrNiMo)
Working temperature Up to 150°C
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