Installation manual

Introduction
5
851--160116 / B
2 INSTALLATION OF THE SONAR TRUNK
2.1 Mounting of the trunk
The location of the sonar trunk has to be carefully selected, as
described in chapter 1.2. Refer also to figures 4 and 5.
Note the orientation of the centre line of the trunk with regard to
the mounting bolts, shown in figure 3.
Note ! Remove the gasket on the top flange during the welding.
Figure 3 - Orientation of the sonar
trunk
The height from the top of the trunk flange to the underside of the
protection blister must be minimum 920 mm (36 1/4”) as shown
in figures 4 and 5.
The top flange must be parallel to the construction loadline in the
fore-and-aft as well as the athwartships direction.
The installation trunk must be welded to an inserted plate which
should be 1.5times asthick as theoriginal shell plate.The size may
be determined by the shipyard or the responsible maritime
authorities. The trunk must be stiffened to the inserted plate by
welding knee-plates on the trunk in both fore-and-aft and
athwartships directions.