Prerequisites
The vessel is in dry dock. The SN90 system is turned off. The following tools and consumables are required:
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Plastic brush + Mild synthetic detergent |
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Fine‑grade sandpaper (240 inch grit size) |
NoteBecause some paint types may be aggressive to the polymer in the transducer, consult our list of approved anti-fouling paints.
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.
Context
The transducer is not designed with any protection against biological fouling. Anti-fouling paint may therefore be applied to the transducer face. To minimize the negative acoustical effects the layer of anti-fouling paint must be as thin as possible.
NoteThe use of anti-fouling paint will reduce the acoustical performance of the transducer. The properties of the transducer face combined with the thickness of the anti-fouling paint can also affect the overall performance. Kongsberg Discovery cannot be held responsible for any negative consequences of the anti-fouling paint.
Observe the relevant instructions and safety information provided by the paint manufacturer.
NoteA hull unit may be provided as an option. It allows you to lower and hoist the transducer. All information and tasks related to the hull unit may be disregarded and omitted if the SN90 system is installed without this unit.
Further requirements
The contractor or shipyard must keep a daily paint log recording all relevant information from the surface treatment.