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About the installation trunk
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 MF90 system, the physical
location of the installation trunk must be carefully selected.
The installation trunk is not used when a gate valve is mounted. The installation trunk is
then replaced with a transducer dock.
The MF90 system can be provided with one of the following hull units:
Hull Unit
Lowering depth (m)
Transducer cables (m)
Maximum speed
(knots)
4.6
MF90
1.0
10
20
4.6
MF94
2.1
7
19
The same transducer is used on all hull unit types.
Due to the different flange diameters, different installation trunks are used.
Installation trunk
Part number
Upper diameter (mm)
Bottom diameter (mm)
MF90
408615
370
273
427423
760
610
MF94
434529
760
356
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
The optional installation trunk offered by Kongsberg Maritime is approved by Det Norske
Veritas (DNVGL), and includes a blind flange and a rubber gasket. If the installation trunk
is manufactured locally, the installation shipyard is responsible for obtaining the approval
certificates from the relevant national registry.
Topics
Summary of Contents for Simrad MF90
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