Kongsberg Simrad SN90, Installation Manual

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381298/C
49
Ventilation
The sonar room must be connected to the vessel's ventilation system. If this is not
possible, two 3” vents must be provided from the sonar room to the main deck.
In the room, the air inlet must whenever possible be located close to the deck and the
outlet as high as possible. A funnel shaped drip-collector must be mounted below the
vent pipes to divert moisture to the bilge. On the main deck, the best ventilation is
provided when the outlet pipe is at least four meters higher than the inlet pipe. To keep
out sea water, rain and spray, the ventilation pipes should be fitted with goosenecks
or a equivalent design.
Note
If the vessel is likely to operate in tropical conditions, a suitable air conditioning system
must be installed. This system must be able to provide an ambient temperature not
exceeding the maximum operating temperatures of the cabinets installed in the room.
Electrical installations, cables and communication
The electrical installations in the sonar room must meet minimum requirements to
provide suitable lights and supply power.
1 If the cables between the sonar room equipment and other system units located in
different compartments on the vessel pass through hatches or areas where they
may be damaged, they must be run through conduits (minimum 2” conduit is
recommended).
2 The sonar room must be equipped with a telephone, an intercom system, or any
other means of oral communication between the sonar room and the bridge and/or
control room(s).
3 The sonar room must be equipped with suitable lighting to simplify the installation
and to aid future maintenance.
4 Each system unit in the sonar room should be provided with a separate circuit
breaker on the mains supply.
5 Proper vessel ground must be provided.
6 A minimum number of additional electrical outlets must be provided for other
equipment.
7 Make sure that all system cables are properly secure, but also installed with some
slack. This is essential to withstand vibrations, and to facilitate maintenance.
Preparations