NoteA hull unit may be provided as an option. It allows you to lower and hoist the transducer. All information and tasks related to the hull unit and installation trunk may be disregarded and omitted if the SN90 system is installed without a hull unit.
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 SN90 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.
NoteIf 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.