Marine Installation Manual 2022-03 1-17
1 Engine Summary
1.3 Fuel operating modes
X62DF-S2.0
1.3.4 Changeover between operating modes
The changeover between operating modes is the process of the engine changing
between different fuel operating modes (see section 1.3,  1-8).
Depending on the type of changeover between operating modes, the time re-
quired will vary. Generally, a changeover of operation mode from gas to liquid
fuel is executed immediately. However, the introduction of gas will take a few
minutes depending on the operating modes.
All changeovers are restricted by the engine power availability of each operating
mode (see Figure 1-3,  1-8).
Transfers and gas trips
The changeover between operating modes can be categorised in two ways. If the
changeover introduces or continues to use gas fuel, it is called a transfer. If the
changeover between operation mode stops the use of gas fuel, therefore de-
faulting to diesel mode, then the changeover is called a gas trip (or just a trip).
Often a gas trip is associated with automatic initiation as part of a system safety
procedure, but it can also be intentionally initiated by the operator. In compar-
ison to a gas trip, the transfer between operating modes can only happen from
operator initiation.
Figure 1-12 Fuel transfers and gas trips
Diesel only operation mode: An overload of 110 % is permitted in emergency conditions
(SOLAS Regulations II-1/3.6)
Gas fuel operation mode: No overload is available in gas mode, as the maximum
continuous output is 100 % of rated power
SM-0693
CSM or FSM
Gas Fuel
Operation
Diesel Only
Operation
T
r
a
n
s
f
e
r
T
r
a
n
s
f
e
r
Gas Trip
T
r
a
n
s
f
e
r
M
G
O
o
r
M
D
O
O
N
L
Y
M
G
O
o
r
M
D
O
O
N
L
Y
Gas Mode
Diesel Mode
HFO MGO
MDO
GAS
MGO
MDOGAS
HFO MGO
MDO
*
*
This includes iCER diesel Tier III mode
(MGO only), if contracted
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