MAN B&W 14.02
Page 1 of 3
MAN Diesel
MAN B&W MC/MCC, ME-B engines 198 65 86-2.3
Running with auxiliary blower
Running with turbocharger
The engine is provided with a minimum of two
electrically driven auxiliary blowers, the actual
number depending on the number of cylinders as
well as the turbocharger make and amount. Be-
tween the scavenge air cooler and the scavenge
air receiver, nonreturn valves are fitted which
close automatically when the auxiliary blowers
start supplying the scavenge air.
The auxiliary blowers start operating consecu-
tively before the engine is started and will ensure
complete scavenging of the cylinders in the start-
ing phase, thus providing the best conditions for a
safe start.
During operation of the engine, the auxiliary blow-
ers will start automatically whenever the blower
inlet pressure drops below a preset pressure,
corresponding to an engine load of approximately
25-35%. The blowers will continue to operate until
the blower inlet pressure again exceeds the preset
pressure plus an appropriate hysteresis (i.e. taking
recent pressure history into account), correspond-
ing to an engine load of approximately 30-40%.
Emergency running
If one of the auxiliary blowers is out of function,
the other auxiliary blower will function in the sys-
tem, without any manual adjustment of the valves
being necessary.
Scavenge air cooler requirements
The data for the scavenge air cooler is specified in
the description of the cooling water system chosen.
For further information, please refer to our publi-
cation titled:
Influence of Ambient Temperature Conditions
The publication is available at: www.mandiesel.com
under ‘Quicklinks’ → ‘Technical Papers’
Fig. 14.02.01: Auxiliary blowers for scavenge air system
Auxiliary Blowers
178 44 70-5.1
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