Simrad SP90 - REV E, Installation Manual

Page: 44 / 232

Simrad SP90
32
851-164510 / Rev.E
3.2 Mounting the trunk
The location of the sonar trunk must be carefully selected.
Note:
Note the orientation of the centre line of the trunk with regard to
the mounting bolts.
Note:
Remove the gasket on the top flange during welding.
Parallel to the
centre line
(CD16001D) 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 as shown in the referenced
figures.
The top flange must be parallel to the construction water-line in
both the fore-and-aft and athwartships directions.
The installation trunk must be welded to a doubling plate which
should be at least 1.5 times as thick as the surrounding shell
plating. The doubling plate’s final dimensions are to be
governed by the approved installation drawings supplied by the
shipyard. The trunk must also be stiffened by welding
knee-plates to it and the doubling plate in both the fore-and-aft
and athwartships directions.
Related topics
→
Installation planning, page 24
→
Trunk installation principles, page 34