Hull unit installation example: Top view
The hull unit is located in the sonar room. This example shows a typical sonar room seen from above.
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A Mechanical support brackets
Due to its height and weight, the hull unit gantry must be secured to the bulkhead by means of mechanical support brackets.
B Transducer cable
C Transducer connector
D Transceiver Unit
E Strengthening knee plates (stiffereners)
The location of strengthening plates (stiffeners) on the installation trunk is indicated. Minimum four strengthening plates must be used.
The installation trunk must be secured to the bulkheads and/or the hull by means of strengthening plates (stiffereners). The dimensions and strength of the plates must be adequate to prevent any vibrations. This is an invariable requirement to ensure the safety of the SU90 system and the vessel.
Stiffen the installation trunk in both the fore-and-aft and athwartship directions by welding strengthening knee-plates both to the trunk and to the hull plating. The shape and locations of the strengthening plates must be determined by the installation shipyard based on the physical properties of the installation trunk, the hull and the space available. The minimum plate thickness is 10 mm, but the classification society can specify other dimensions.
Due to its height and weight, the hull unit gantry must be secured to the bulkhead by means of mechanical support brackets. The dimensions and strength of the support brackets must be adequate to prevent vortex induced vibrations. This is an invariable requirement to ensure the safety of the SU90 system and the vessel.
Note
It is the installation shipyard's responsibility that the installation trunk and the hull unit gantry are properly secured against vibrations and sudden movements caused by the vessel's behaviour in the sea.