Man B&W S80ME-C7, Project Manual

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MAN B&W 18.04
Page of 7
MAN Diesel
MAN B&W ME/MEC/MEGI/ME-B engines 198 45 838.4
Alarm – Slow Down and Shut Down System
Alarm, slow down and remote indication sensors
The International Association of Classification So-
cieties (IACS) indicates that a common sensor can
be used for alarm, slow down and remote indica-
tion.
A general view of the alarm, slow down and shut
down systems is shown in Fig. 8.04.0.
Tables 8.04.02 and 8.04.03 show the require-
ments by MAN Diesel for alarm and slow down
and for UMS by the classification societies (Class),
as well as IACS’ recommendations.
The number of sensors to be applied to a specific
plant for UMS is the sum of requirements of the
classification society, the Buyer and MAN Diesel.
If further analogue sensors are required, they can
be ordered as option: 4 75 28.
The slow down functions are designed to safe-
guard the engine components against overloading
during normal service conditions and to keep the
ship manoeuvrable if fault conditions occur.
The slow down sequence must be adapted to the
actual plant parameters, such as for FPP or CPP,
engine with or without shaft generator, and to the
required operating mode.
The shut down system must be electrically sepa-
rated from other systems by using independent
sensors, or sensors common for the alarm system
but with galvanically separated electrical circuits,
i.e. one sensor with two sets of electrically inde-
pendent terminals. The list of sensors are shown
in Table 8.04.04.
Attended Machinery Space (AMS)
The basic safety system for a MAN Diesel engine
is designed for Attended Machinery Space and
comprises the temperature sensors and pressure
sensors that are specified in the ‘MAN Diesel’ col-
umn for shut down in Table 8.04.04.
These sensors are included in the basic scope of
supply (option: 4 75 24) and are also included for
UMS.
Unattended Machinery Space (UMS)
In the ‘Extent of Delivery’ an asterisk (*) marks
items normally required for plants designed for
UMS including the sensors for alarm and slow
down, option: 4 75 27, but not those for shut
down.
The shut down and slow down panels can be or-
dered as options: 4 75 60, 4 75 64 or 4 75 65
whereas the alarm panel is yard’s supply, as it
normally includes several other alarms than those
for the main engine.
For practical reasons, the sensors for the engine
itself are normally delivered from the engine sup-
plier, so they can be wired to terminal boxes on
the engine.
The number and position of the terminal boxes
depends on the degree of dismantling specified in
the Dispatch Pattern for the transportation of the
engine based on the lifting capacities available at
the engine maker and at the yard.