Prerequisites
The vessel is in dry dock. The SU90 system is turned off. Neither tools nor instruments are required for the visual inspection.
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Relevant tools are required to remove marine growth and to apply anti-fouling paint. All tools must be provided by the shipyard. |
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Anti-fouling paint must be provided by the shipyard. |
NoteDo not direct high-pressure water or sandblasting spray towards the transducer. This will damage the transducer beyond repair.
Two persons are needed to do the task.
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One person must stay in the sonar room to operate the hull unit. |
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One person must stay in the dry dock, under the hull, to make sure that the transducer is not lowered too far down. |
Proper oral communication must exist between the sonar room and the dry dock personnel.
Procedure
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1 |
Make sure that all power to the hull unit is disconnected. |
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Cover the opening in the installation trunk with a solid wooden or steel plate to protect the transducer. |
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Do a close visual inspection of the blister and the hull plating close to the installation trunk.
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Apply anti-fouling paint to protect the hull plating and prevent marine growth. |
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c |
Make sure that all surfaces are protected with a high quality coating. |
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Access the inside of the installation trunk. |
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5 |
Do a close visual inspection of the inside of the installation trunk.
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a |
Remove marine growth.
NoteDo not direct high-pressure water or sandblasting spray towards the transducer. This will damage the transducer beyond repair.
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b |
Apply anti-fouling paint. |
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c |
Make sure that the inside of the installation trunk is properly protected with coating. |
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6 |
Use the hand crank to hoist the transducer. |
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While hoisting, make sure that you have ample space between the transducer and the inside wall of the installation trunk. |