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 SU90 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 SU90 system can be provided with one of the following hull units:
Hull Unit Lowering depth (m) Transducer cable (m) Maximum speed (knots)
SU92 1.2 4.6 21
7
SU93 1.6 4.6 16
7
SU94 2.1 4.6 11
7
The same transducer is used on all hull unit types.
If a Hull Unit Controller is supplied with the system, the Motor Control Unit cabinet is used as a junction box.
The same transducer is used on all hull unit types.
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.