Kongsberg Simrad MF90, Installation Manual

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476671/B
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Such tools can cause serious electrical and/or mechanical damage. If heavy maintenance or
construction work in the sonar room cannot be avoided, all MF90 system units must be well
protected against dust, dirt and damage. Kongsberg Maritime AS takes no responsibility for
any failures or damage to MF90 system units that are caused by installation, maintenance or
construction work in the sonar room.
Visit the sonar room at regular intervals to check for dust, high temperature and humidity.
Take the necessary actions if the environmental conditions are poor. We recommended that
you keep the ambient temperature b5 and +40°C, and the relative humidity less than
80%. The Mean Time Between Failure (MTBF) will increase if these limits are exceeded.
Observe the environmental specifications related to each unit.
Related topics
Sonar room requirements, page 62
Preparations, page 42
Requirements for watertight integrity
The size, location and design of the sonar room must fulfil all the requirements to the
vessel’s watertight integrity.
In the event of a major leak, it must be possible to close all watertight hatches and/or doors
to the room to maintain vessel stability and safety.
The physical size of the sonar room must be limited, so that in the event of a major leak, the
flooding of the room will not induce instability, or cause the vessel to capsize or sink.
Inspect all watertight decks and bulkheads periodically. Make sure that there are no
unprotected openings or improper penetrations that may allow progressive flooding from
the compartment. Make sure that the watertight doors and hatches are in place and in good
working order.
Install and activate bilge high level sensors to provide an early warning of abnormal
accumulation of water. Position the sensors as low as possible along the centre area of the
compartment, and/or in other locations where the water will gravitate to first. Inspect the
bilge sensors periodically.
All cables leading in and out of the sonar room must be run in steel conduits. These steel
conduits must reach up and above the freeboard deck.
If required, all design documents related to the sonar room and the watertight integrity
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.
Preparations