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Simrad ES38B
3.
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)
16
The standard procedure for flush mounting on a steel vessel is
to weld a steel tank inside the hull, and mount the transducer
into this tank.
Use the mounting ring
Large circular transducers are designed to be mounted using
a mounting ring. A suitable mounting can be provided by
Simrad, drawings are also available for local production. The
mounting ring is welded to the hole prepared for the transducer.
Bolts through the transducer body into the mounting ring will
secure the transducer in place. Note that several transducers use
direction guides to allow correct mounting.
Smooth surface is important
Mounting screws or bolts must not be extruding from the
transducer or the area immediately around it. Make sure that the
surface of the transducer face, the installation hardware used to
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 ES38B 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.
Water filled
As for a blister, the interior of the tank must be filled with water.
This can be accomplished by air release through a steel tube,
which is extended either to open air 1.5 m above the water line
or to the water outside the hull at a point higher than the tank
interior.
If the tube is extended to open air, drainage must be provided
with leakage at the transducer flange or a separate hole in the
tank bottom.
[3]
338462/B
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