Simrad SP90 - REV E, Installation Manual

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Installation planning
27
851-164510 / Rev.E
2.3 Sonar room requirements
Size
The sonar room must be dimensioned to house both the Hull
Unit and the Transceiver Unit. This is due to the limited length
of the flexible hose protected cabling (approximately 3.5 m)
connecting these two units.
A well designed sonar room reduces the risk of corrosion and
simplifies maintenance increasing system reliability. The sonar
room should not be unnecessarily obstructed by girders, pipes
etc. which might cause installation problems or impede
maintenance.
Access hatches
The sonar room must be accessible under all conditions at sea or
at a berth. All doors or hatches should be designed so that the
equipment can be removed without being disassembled.
Lifting
An attachment point, rated at a minimum of two -2- tons, for
supporting a lifting device should be located above the Hull
Unit. This permanently installed fixture will facilitate Trunk and
Hull Unit mounting and also may be used for service of the
equipment in the future.
Heating
The sonar room should be equipped with heater, dimensioned to
maintain the equipment within its environmental tolerances (at
least 1000 W), installed close to the deck. Heating is also an
effective method for reducing humidity.
Insulation
Bulkheads must be insulated and provided with an interior wall
to the deck. The insulation should be the minimum equivalent of
50 mm of rock-wool. In addition, piping passing through the
space prone to condensation must be insulated.
Ventilation
The sonar room should be connected to the vessel’s ventilation
system. If this is not possible, two 3-inch vents must be
provided from the sonar room to the main deck.
In the sonar room, the air inlet should be located in close to the
deck and the outlet as high as possible. A funnel shaped
drip-collector should be mounted below the vent pipes to divert
moisture to the bilge.