22
451253/A
Cavitation
Cavitation is the formation of small air bubbles close to the SBP 29 face. The bubbles
appear because the local pressure becomes negative during parts of the acoustic pressure
cycles. The cavitation threshold increases with the hydrostatic pressure. The noise is
made when the bubbles implode.
Transmitting in air
The SBP 29 must never be lifted free of the water surface. If the SBP 29 is activated
when out of the water it may be damaged beyond repair. Mounting the SBP 29 at a deep
position on the hull will in normally prevent this.
Slamming
Slamming 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 SBP 29 up, and may cause damage
both to the SBP 29 and to its mounting. This is especially important for low frequency
SBP 29 with large faces. The effect of slamming can be reduced by mounting the SBP 29
as deep as possible on the hull.
Note
Kongsberg Maritime AS takes no responsibility for any damages to the SBP 29, the cable
or the mounting arrangement, caused by slamming.
Avoid protruding objects near the SBP 29
Objects protruding from the hull will generate turbulence and flow noise. This will
reduce the SBP 29 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. All these protruding objects may act as resonant cavities amplifying the
flow noise at certain frequencies.
Do not place a SBP 29 in the vicinity of protruding objects, and especially not close
behind them. Make sure that the surface of the SBP 29 face, the hull plating and putty
around the SBP 29 is as even and smooth as possible. Mounting screws or bolts must
not be extruding from the SBP 29, the installation hardware or the hull plating. If
necessary, grind and polish all surfaces.
SBP 29 Installation Manual
Summary of Contents for SBP 29
Page 1: ...451253 A November 2019 Kongsberg Maritime AS SBP 29 Sub bottom profiler Installation Manual ...
Page 111: ...451253 A 111 Figure 12 862 216859 Drawing files ...
Page 112: ...112 451253 A Figure 13 307904 SBP 29 Installation Manual ...
Page 113: ...451253 A 113 Figure 14 862 218001 Drawing files ...
Page 114: ...114 451253 A Figure 15 871 219193 SBP 29 Installation Manual ...
Page 115: ...451253 A 115 Figure 16 871 219201 Drawing files ...
Page 116: ...116 451253 A Figure 17 388168 SBP 29 Installation Manual ...
Page 117: ...451253 A 117 Figure 18 871 219187 Drawing files ...
Page 118: ...118 451253 A Figure 19 821 219199 SBP 29 Installation Manual ...
Page 119: ...451253 A 119 Figure 20 388235 Drawing files ...
Page 120: ...120 451253 A Figure 21 871 219198 SBP 29 Installation Manual ...
Page 121: ...451253 A 121 Figure 22 388148 Drawing files ...
Page 122: ...122 451253 A Figure 23 315550 SBP 29 Installation Manual ...
Page 123: ...451253 A 123 Figure 24 430751 Drawing files ...
Page 124: ...124 451253 A Figure 25 871 212984 SBP 29 Installation Manual ...
Page 125: ...451253 A 125 Figure 26 407070 Drawing files ...
Page 126: ...126 451253 A Figure 27 448231_1A SBP 29 Installation Manual ...
Page 127: ...451253 A 127 Figure 28 427512 Drawing files ...
Page 128: ...128 451253 A Figure 29 435680 SBP 29 Installation Manual ...
Page 129: ...451253 A 129 Figure 30 444783 Drawing files ...
Page 151: ......
Page 152: ... 2019 Kongsberg Maritime ...