Marine Installation Manual
2021-08
3-19
3 Engine Installation
3.11 Fire protection
X72DF
3.11
Fire protection
Fires may develop in areas such as scavenge air receiver /piston underside. The
engine is fitted with a piping system which leads the fire extinguishing agent into
the critical areas.
Where fire protection is required, the final arrangement of the fire extinguishing
system is to be submitted for approval to the relevant classification society.
Extinguishing agents
Various extinguishing agents can be considered for fire fighting purposes. They
are selected either by the shipbuilder or the ship owner in compliance with the
rules of the classification society involved.
Steam as an alternative fire extinguishing medium is permissible for the scavenge
air spaces of the piston underside, but may cause corrosion if countermeasures
are not taken immediately after its use.
These countermeasures comprise:
—
Opening scavenge spaces and removing oil and carbon deposits
—
Drying all unpainted surfaces and applying rust protection (i.e. LO)
Table 3
-
3
Recommended quantities of fire extinguishing medium
NOTE
If steam is used for the scavenge spaces, a water trap is recommended
to be installed at each entry to the engine and assurance obtained that
steam shut-off valves are tight when not in use.
Piston underside and
scavenge air receiver
Bottle
Number of cylinders
5
6
7
8
Volume
[m
3
/cyl]
Mass
[kg/cyl]
Size
[kg]
Extinguishing medium
Quantity of fire
extinguishing bottles
8
29
45
Carbon dioxide (CO
2
)
4
4
5
6
