Mechanical support of the hull unit gantry
Due to its physical size and weight, and the fact that the installation trunk penetrates the vessel hull, it is very important that the hull unit is installed and secured properly.
Important
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.
We recommend that support brackets are placed pointing at minimum three directions with approximately 120 degrees between them.
The mechanical support brackets must be designed and manufactured by the installation shipyard to fit the complete installation in the sonar room. All calculations made to support the design must meet the applicable safety requirements, and apply to the physical properties of the complete installation.
The forces to which the hull unit is exposed depends on its physical size, its location, and the vessel's behaviour in rough sea. It is very important that the hull unit is sufficiently supported. The forces applied by vibrations and the vessel's movements in the sea can affect the quality of the system performance, the endurance of the physical installation, and the vessel's safety.
Note
The final design and the installation must be approved by the classification society. Without a proper mechanical support for the hull unit gantry, the guarantee will be void!