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Figure 6 Box keel installation
A
Box keel
U-shaped
B
support
bar (only
recommended
on large
transducers)
C
Stuffing tube
D
Cable in steel
conduit
Cable service
E
loop
Transducer flush mounted in a steel tank
2.
Slamming is the impact of the bottom structure of a ship onto the sea surface. It is mainly observed
while sailing in waves, when the bow raises from the water and subsequently impacts on it. Slamming
induces extremely high loads to ship structures and is taken under consideration when designing ships.
(Wikipedia)
130003/D
mount it, the hull plating and the putty around the transducer is
as even and smooth as possible. Obstructions on these surfaces
will create problems with turbulent flow.
Use a horizontal support bar on large
transducers
Due to its physical size, the 38-7 transducer must be fitted with
a horizontal support bar. The purpose of this support bar is to
protect the transducer from damage in the event of slamming.
This happens if the vessel hull climbs out of the water in heavy
seas. The force of the water when the hull falls down may push
the transducer up and cause damage to its mounting. The support
bar can be secured to the mounting ring using threaded rods. See
Support bar [206574] on page 39.
Example: Box keel installation
The figure below illustrates a symmetrical box keel installation.
Flush mounting is used on very large vessels with a hull so deep
that no air bubbles are found below the hull, and on vessels
operating in shallow harbours or waters, where a protruding
blister can not be accepted.
How to install the transducer
[2]
15
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