Marine Installation Manual 2022-03 2-9
2 Engine Power and Speed
2.5 Power range limits
X62DF-S2.0
Overload Power Range
Line 6, Line 2 and Line 13 form the curve for the engine’s overload power limit,
as defined by Formula 2-5,  2-8. Each component is governed by different coef-
ficients (see Table 2-2).
Table 2-2 Line 6 coefficients
The area above Lines 1 and 9 is the overload range. It is only permissible to op-
erate engines in this range for a maximum duration of one hour during sea trials
and in the presence of an authorised engine builder representative.
The area between Lines 1, 5 and 6 (Figure 2-3,  2-6), called ‘service range with
operational time limit’, is only applicable to transient conditions in diesel mode
(i.e. passing through a barred speed range, sea trial or emergency fast accelera-
tion). The engine can only be operated in this area for limited periods of time, in
particular one hour per 24 hours.
Line no. Range (n /n
CMCR
) C2 C1 C0
Line 6 0.00 - 0.40 0.000 0.600 0.000
0.40 - 0.60 0.330 0.468 0.000
0.60 - 0.96 1.110 0.000 0.000
Line 2 0.96 - 1.032 0.000 1.066 0.000
Line 13 1.032 - 1.08 0.000 0.000 1.100
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