Alarm – Slow Down And Shut Down System; Basic Safety System Design And Supply; Alarm, Slow Down And Remote Indication Sensors; Slow Down Functions - Man B&W S50ME-B9.3-TII Project Manual

MAN B&W
Alarm – Slow Down and Shut Down System
The shut down system must be electrically sepa-
rated from other systems by using independent
sensors, or sensors common to the alarm system
and the monitoring system but with galvanically
separated electrical circuits, i.e. one sensor with
two sets of electrically independent terminals. The
list of sensors are shown in Table 18.04.04.

Basic safety system design and supply

The basic safety sensors for a MAN B&W engine
are designed for Unattended Machinery Space
(UMS) and comprises:
• the temperature sensors and pressure sensors
that are specified in the 'MAN Diesel' column for
shut down in Table 18.04.04.
These sensors are included in the basic Extent of
Delivery, EoD: 4 75 124.
Alarm and slow down system design and supply
The basic alarm and slow down sensors for a
MAN B&W engine are designed for Unattended
Machinery Space (UMS) and comprises:
• the sensors for alarm and slow down.
These sensors are included in the basic Extent of
Delivery, EoD: 4 75 127.
The shut down and slow down panels can be or-
dered as options: 4 75 630, 4 75 614 or 4 75 615
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.
MAN B&W MC/MC-C, ME/MEC/ME-B/GI engines
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.

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. 18.04.01.
Tables 18.04.02 and 18.04.03 show the require-
ments by MAN Diesel & Turbo 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 is the sum of requirements of the classifica-
tion society, the Buyer and MAN Diesel & Turbo.
If further analogue sensors are required, they can
be ordered as option: 4 75 128.

Slow down functions

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.
MAN Diesel
18.04
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