Kongsberg EM 712, Installation Manual

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401027/B
Gondola
A gondola is a streamlined pod mounted under the hull of the ship. It can either be
welded or bolted under the hull plates. It is well suited for refitting a vessel with an
EM 712 system.
There is a gap between the gondola and
the hull. Aerated water will pass through
this gap, and thus not be pushed under the
transducer.
This is often the preferred installation
approach for Kongsberg Maritime and the
method that gives the optimum weather
window and system performance.
The gondola can be tailored to fit the ship
and also the scope of supply.
Kongsberg Maritime recommends to place
a "debris knife" in the forward end of the
gondola.
The gondola will be water filled. To let the
air escape, make suitable holes in the rear
end close to the vessel’s hull.
A gondola installation may help in avoiding air bubble blockage of the sound path under
the transducers by aerated water. Gondolas may also contain additional transducers
for other systems.
Note
The inside surface of the gondola must be protected with appropriate protective paint
and an adequate amount of sacrificial anodes.
The installation shipyard must provide all necessary installation drawings.
If required, all drawings and documents must be approved by the vessel’s national
registry and corresponding maritime authority and/or classification society.
Such approval must be obtained before the installation can begin. The shipowner
and shipyard doing the installation are responsible for obtaining and paying for such
approval.
Kongsberg EM 712 Installation manual