126
419050/B
Verifying the quality of the installation
Once the installation trunk and blister have been installed, a quality inspection must take
place. The purpose of the inspection is to makes sure that the installation trunk has been
installed correctly, and that the hull unit can be mounted on top of it.
Prerequisites
Neither tools nor instruments are required.
Context
The installation trunk must be mounted so that it remains vertical during normal
operating conditions.
The top mating surface of the installation trunk must be protected with a wooden cover
at all times until the hull unit is installed. It is very important that this surface is clean
and undamaged, because it must be watertight after the hull unit has been installed
on top of the installation trunk.
Objects protruding from the hull will generate turbulence and flow noise. This will
reduce the SC90 performance. Protruding objects may be zinc anodes, transducers or
even the vessel's keel. Holes and pipe outlets are also important noise sources, as well as
rough surfaces caused by bad welding. Even traces of sealing compound, sharp edges,
bolts or empty bolt holes will create noise.
Procedure
1
Write down the key measurements.
This is for future reference.
• Horizontal distance from the keel to the centre of the installation trunk
• Height from the bottom of keel to the top of the installation trunk
• Total height of the installation trunk (with optional blister)
2
Do a close visual inspection of the physical properties of the installation trunk and
the way it has been installed.
Refer to the applicable requirements.
a
Make sure that the upper surface of the installation trunk is level, undamaged
and clean.
b
Make sure that the installation trunk has been properly stiffened in both the
fore-and-aft and athwartship directions by means of strengthening knee plates.
c
Make sure that the installation trunk has been properly braced to the hull
plating and the surrounding hull frames.
3
Do a close visual inspection of the blister and the hull plating close to the
installation trunk.
Check for any kind of objects that may cause noise.
Simrad SC90 Installation Manual
Содержание SC90
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