MAN B&W 12.08
Page 2 of 2
MAN Diesel
MAN B&W 70-26MC/MCC,
70-35ME/MEC/ME-B/GI engines
198 83 46-5.0
Preheating of diesel engine
Preheating during standstill periods
During short stays in port (i.e. less than 45 days),
it is recommended that the engine is kept pre-
heated, the purpose being to prevent temperature
variation in the engine structure and correspond-
ing variation in thermal expansions and possible
leakages.
The jacket cooling water outlet temperature should
be kept as high as possible and should – before
starting up – be increased to at least 50 °C, either
by means of cooling water from the auxiliary en-
gines, or by means of a builtin preheater in the
jacket cooling water system, or a combination.
Fig. 12.08.01: Jacket water preheater, example
178 16 631.1
Temperature
increase of
jacket water
Preheater
capacity in
% of nominal
MCR power
1.25%
1.50% 0.75%
0.50%
1.00%
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70
hours
Preheating time
°C
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