Marine Installation Manual 2021-08 4-73
4 Ancillary Systems
4.6 Fuel oil system
X72DF
Option 2
Filter installation in the booster circuit:
The maximum 10 m abs. filter is installed in the booster circuit close to engine
inlet. The filter needs to be laid out for a maximum working temperature of
150 °C.
Advantage and disadvantage of this filter position:
Table 4-12 Specification of automatic self-cleaning filter in booster system
Advantage Optimum engine protection from fuel oil catfines and other abrasive
particles from system wear
Disadvantage Booster pump is not ideally protected against catfines
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. 12bar at filter inlet
Test pressure Specified by classification society
Permitted differential press.
at 17 and 20 cSt
— clean filter: max. 0.2bar
— 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. 10m abs.
Mesh size bypass filter Max. 25m abs.
Filter insert material Stainless steel mesh (CrNiMo)
Working temperature Up to 150 °C
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