Kongsberg Simrad SN90, Installation Manual

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381298/C
81
Watertight integrity
The installation of the SN90 transducer will require a hole in the hull for the transducer
cables. This will put the watertight integrity of the vessel at risk.
The size, location and design of the compartment immediately over the mounting
location must fulfil all requirements to the vessel’s watertight integrity. In the event of a
major leak through the cable gland(s), it must be possible to close all watertight hatches
and/or doors to the compartment in order to maintain the vessel stability and safety.
The physical size of the compartment must be limited, so that in the event of a major
leak, the flooding of the compartment will not induce instability, or cause the vessel
to capsize or sink.
• Ensure that all watertight decks and bulkheads are inspected periodically to verify
that there are no unprotected openings or improper penetrations that will allow
progressive flooding from the compartment, and that the watertight doors and hatches
are in place and in working order.
• Ensure that bilge high level alarms are arranged to provide the earliest warnings of
abnormal accumulation. The high level bilge alarms must be set as low as possible
to the deck or bilge well and positioned along the centre area of the compartment or
in a location at which the fluids will gravitate to first.
All cables leading in and out of the compartment must be run in steel conduits. These
steel conduits must reach up and above the freeboard deck.
Installation drawings
The installation shipyard must provide all necessary design and installation drawings, as
well as the relevant work standards and mounting procedures.
If required, all documents provided by the shipyard for the physical installation of the
SN90 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.
Installing the transducer