Simrad SP60 - REV D, Installation Manual

Page: 45 / 218

Installation trunk
29
851-164574 / C
3 SONAR TRUNK
3.1 Mounting of the trunk
The location of the sonar trunk must be carefully selected.
→
Refer to the Installation planning information on page 22.
Note
Note the orientation of the centre line of the trunk with regard to
the mounting bolts. Remove the gasket on the top flange during
welding.
Figure 5 Orientation of the
sonar trunk
Parallel to
centre line
(CD1883)
∝± °
1
∝
The height from the top of the trunk flange, to the underside of the
protection blister, must be as shown in the referenced figures.
→
Refer to figures 6 and 7 on pages 32 and 33.
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.