Noise Sources; Dry Docking; Wiring - Simrad ES70 - INSTALLATION REV A Installation Manual

Simrad ES70

Noise sources

The vessel's hull, rudder(s) and propeller(s) should be thoroughly inspected in dry dock
prior to installation. Roughness below the water-line deformities in the shell plating and
protruding obstacles can create underwater noise. These sources of turbulence must be
smoothed or removed as best as possible. It is especially important that the propeller(s)
is not pitted or damaged.

Dry docking

Make sure that ample clearance under the sonar trunk and/or protection blister is
provided when dry docking the vessel. Avoid locating supporting blocks or structures in
the vicinity of this equipment.
Note
The location of the transducer and/or protection blister must be noted on the vessel's
docking plan for future reference.
Power down all hydroacoustic systems, and label each system accordingly to prevent
accidental power on. Remove circuit breakers if necessary.

Wiring

All cables running between system cabinets located in different rooms and/or on different
decks must be supported and protected along their entire lengths using conduits and/or
cable trays. Note that the cables must not be installed in the vicinity of high-power
supplies and cables, antenna cables or other possible sources of interference.
For more detailed information about cables and wiring, refer to Basic cable requirements
on page 187.
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