Kongsberg Simrad MF90, Installation Manual

Page: 103 / 426

476671/B
101
Hull unit installation example: Side view (off keel/with blister), page 108
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.
Illustration:
A Mechanical support brackets
B Bulkhead
C Hull Unit
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
MF90 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.
Installing the hull unit