Kongsberg Simrad MF90, Installation Manual

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82
476671/B
Important
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 MF90 system and the vessel.
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. Minimum four strengthening plates must be used. Each strengthening plate must
extend all the way from the bottom to the top of the installation trunk. Only leave a small
gap to allow access to the bolts and nuts used to secure the mounting flange. The minimum
plate thickness is 10 mm, but the classification society can specify other dimensions.
The forces to which the hull unit and installation trunk are exposed depends on the physical
size of the units, where they are located, and the vessel's behaviour in rough sea. It is very
important that the hull unit and installation trunk are 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.
MF94 (Number of holes in the flange: 24)
A
Strengthening knee plates (stiffereners)
B
Installation trunk
The strengthening plates must be designed and manufactured by the installation shipyard
to fit the installation trunk. All calculations made to support the design must meet the
applicable safety requirements, and apply to the physical properties of the complete
installation. 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.
Simrad MF90 Installation Manual