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Simrad ST90
Installation trunk description
An installation trunk is required for hull unit installation. The installation trunk is not
included in the standard delivery.
The installation trunk provides the physical foundation for the entire hull unit. The
installation trunk penetrates the hull. The installation trunk is therefore a crucial part
of the hull unit assembly. In order to ensure proper operation of the ST90 system, the
physical location of the installation trunk must be carefully selected.
The installation trunk - with a blind flange - can be ordered from Kongsberg Maritime as
an optional delivery. As an alternative, the installation trunk can be manufactured by the
shipyard based on the drawings in this manual. A locally manufactured installation trunk
can be adjusted to better fit the properties of the vessel's hull.
Note
If the installation trunk is manufactured locally, the installation shipyard is responsible
for obtaining the approval certificates from the relevant national registry.
The installation trunk is not used when a gate valve is mounted. The installation trunk
is then replaced with a transducer dock.
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 ST90 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.
Related topics
Simrad ST90, page 7
System units, page 13
19
110-0035138/A
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