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1. MOUNTING THE EQUIPMENT
1.1 Mounting the Hull Unit
Note1) The rise/lower control box of the hull unit contains motion sensor.
Therefore, never drop the hull unit.
Note2) Take care the handling of the transducer. Do not give a strong shock.
1.1.1 Location of hull unit
Decide the location of the hull unit through consultation with the dockyard and
ship owner. When deciding the location, the following points should be taken into
account.
•
Select an area where propeller noise, cruising noise, air bubbles and
interference from turbulence are at a minimum. Generally, the point at 1/3 to
1/2 of the ship’s length from the bow on or near the keel is optimum.
On-the-keel installation is advantageous for minimizing oil consumption in
comparison with off-the-keel. If the hull unit can not be installed on the keel,
the center of the retraction tank should be within 600 mm of the keel to
prevent a rolling effect. For large ship with deep draft, the hull unit can be
installed at the bow.
1/2
1/3
Within 600 meter
Hull unit mounting location
•
Select a place where the hull bottom is flat and the draft is sufficiently deep.
Normally, the transducer should protrude at least 500 mm beyond the keel to
minimize the effect of air foam and bubbles.
•
Select a place where interference from other equipment is minimal. The hull
unit should be at least 2.5 m away from the transducers of other equipment.
•
No obstacle should be in the fore direction since it causes a shadow zone and
aerated water, resulting in poor sonar performance.
•
The space shown in the figure on the next page is required around the hull
unit for wiring and maintenance.
•
If the ambient temperature of the unit is below 0°C, provide the sonar
compartment with a heater to keep the temperature above 0°C.