Compression Bushing
Washer, SST
Steel Hull
Weldment
Weld all around
Pr’ard
Supplied)
Weld all around
SST Packing Nut
SST Nuts, welded
SST Adapter Plate
to plate.
[4
Places)
Cable Service
LooP/~~&~
TYPICAL STEEL HULL MOUNT WITH CONDUIT
Note:
Certain approval authorities require that the transducer cable be encased
in conduit. In such installations, the conduit is welded to the stuffing tube,
as shown in the figure above. In welded conduit installations, the stuffing
tube must have the packing nut tightened from outside the hull. The
stuffing tube supplied by Raytheon is “reversible”, allowing the compres-
sion bushing to be tightened from inside or outside of the hull.
Once the location for the transducer has been determined, it will be again
necessary to assure the transducer is angled to face the sea bottom directly.
On steel hulled
vesselsa
steel weldment must be fabricated
bythe
shipyard
or procured by the person installing the transducer. The exact dimensions
of the weldment are not specified, but the bottom of the weldment must be
parallel to the water surface, (slightly angled forward about
5’)
and must
be large enough to allow the mounting of the adapter plate.
The weldment should also have an access hole at least as large as the hole
in the adapter plate to allow feeding of the transducer cable up to and
through the stuffing tube. Any sharp edges on the weldment and any weld
spots should be ground smooth to minimize the chance of tearing or
abrading the transducer cable. The adapter plate can either be welded
directly to the weldment or bolted to the weldment at the four places drilled
in the adapter plate. The dimensions of the vertical sides of the weldment
will be determined by the
deadrise
of the hull at the location where the
INSTALLATION 31
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