Auxiliary Blowers; Emergency Running; Control Of The Auxiliary Blowers - Man B&W S80ME-C7 Project Manual

MAN B&W

Auxiliary Blowers

The engine is provided with two electrically driven
auxiliary blowers. Between the scavenge air cooler
and the scavenge air receiver, nonreturn valves
are fitted which close automatically when the aux-
iliary 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 engine
load is reduced to about 3040%, and will con-
tinue operating until the load again exceeds ap-
proximately 4050%.

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.
Fig. 14.02.01: Scavenge air system
MAN B&W S80MEC7/8/9, S70MEC/MEGI7/8,
L70MEC7/8, S65MEC/MEGI8, S60MEC/MEGI7/8,
L60MEC7/8, S50MEC7/8

Control of the auxiliary blowers

The auxiliary blowers are fitted onto the main en-
gine. The control system for the auxiliary blowers
is integrated in the Engine Control System.
The starter panels with starters for the auxiliary
blower motors are not included, they can be or-
dered as an option: 4 55 653.
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'
MAN Diesel
14.02
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