Drain Box for Fuel Oil Leakage Alarm
Any leakage from the fuel oil high pressure pipes
of any cylinder is drained to a common drain box
fitted with a level alarm. This is included in the ba-
sic design of MAN B&W engines.
Bearing Condition Monitoring
Based on our experience, we decided in 1990 that
all plants must include an oil mist detector speci-
fied by MAN Diesel & Turbo. Since then an Oil
Mist Detector (OMD) and optionally some extent
of Bearing Temperature Monitoring (BTM) equip-
ment have made up the warning arrangements for
prevention of crankcase explosions on two-stroke
engines. Both warning systems are approved by
the classification societies.
In order to achieve a response to damage faster
than possible with Oil Mist Detection and Bearing
Temperature Monitoring alone we introduce Bear-
ing Wear Monitoring (BWM) systems. By monitor-
ing the actual bearing wear continuously, mechani-
cal damage to the crank-train bearings (main-,
crank- and crosshead bearings) can be predicted
in time to react and avoid damaging the journal
and bearing housing.
If the oil supply to a main bearing fails, the bearing
temperature will rise and in such a case a Bear-
ing Temperature Monitoring system will trigger
an alarm before wear actually takes place. For
that reason the ultimate protection against severe
bearing damage and the optimum way of provid-
ing early warning, is a combined bearing wear and
temperature monitoring system.
For all types of error situations detected by the
different bearing condition monitoring systems
applies that in addition to damaging the compo-
nents, in extreme cases, a risk of a crankcase
explosion exists.
Oil Mist Detector
The oil mist detector system constantly measures
samples of the atmosphere in the crankcase com-
partments and registers the results on an opti-
cal measuring track, where the opacity (degree
of haziness) is compared with the opacity of the
atmospheric air. If an increased difference is re-
corded, a slow down is activated (a shut down in
case of Germanischer Lloyd).
Furthermore, for shop trials only MAN Diesel &
Turbo requires that the oil mist detector is con-
nected to the shut down system.
For personnel safety, the oil mist detectors and re-
lated equipment are located on the manoeuvring
side of the engine.
The following oil mist detectors are available:
4 75 162 Oil mist detector Graviner MK7.
Make: Kidde Fire Protection
4 75 161 Oil mist detector Graviner MK6.
Make: Kidde Fire Protection
4 75 163 Oil mist detector Visatron VN 215/93.
Make: Schaller Automation
4 75 165 Oil mist detector QMI.
Make: Quality Monitoring Instruments Ltd.
4 75 166 Oil mist detector MD-SX.
Make: Daihatsu Diesel Mfg. Co., Ltd.
4 75 167 Oil mist detector Vision III C.
Make: Specs Corporation
4 75 168 Oil mist detector GDMS-OMDN09.
Make: MSS GmbH
4 75 271 Oil mist detector Triton.
Make: Heinzmann
Examples of piping diagrams (for make Schaller
Automation only) and wiring diagrams (for all other
makes) are shown for reference in Figs. 18.06.01a
and 18.06.01b.
Other Alarm Functions
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