Marine Installation Manual 2021-08 4-76
4 Ancillary Systems
4.6 Fuel oil system
X72DF
4.6.2 Fuel oil system with only MDO/MGO or MGO
If the main engine is designed for only MDO/MGO or MGO fuel oil, the system
may be simplified in comparison to the conventional system specified in section
4.6.1, 4-64.
The changes are as follows:
• The fuel oil mixing unit is omitted.
• The fuel oil end-heater is omitted, along with the associated viscometer and
control logic.
• The simplified fuel oil filter arrangement like that in arrangement 'B' is ap-
plied.
Additional optional changes:
• The feed pump and booster pump can be replaced with a single delivery
pump. If this option is selected, the pump must be located in the recircula-
tion piping and must not be too high relative to the fuel oil tanks (see ()H
in Figure 4-44). This must be in accordance with manufacturer’s specifica-
tion.
Figure 4-44 Fuel oil system — Arrangement with only MDO/MGO or MGO
NOTE
The omission of iCAT may occur with engines specified to operation on
liquid fuel with a sulphur content up to 0.10 % (ultra low sulphur). Please
refer to section 4.3.5, 4-20.
SM-0518
Main
Engine
FM
1
2
V
1 MDO service tank and supply system
2 MGO service tank
3 Fuel changeover valve
4 Flow meter
5 Delivery pump
6 Fuel oil heat exchanger
7 Viscometer
8 Automatic self-cleaning lter
3
4
5
6
7
8
MDO/MGO piping
Common piping
MDO
MGO
PLFURQV
LT Cooling
water system
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