Simrad SX90 - INSTALLATION REV C - Sonar Trunk Installation Principles; Sonar Trunk Protection

SimradSX90
Note
Inordertoobtainoptimalsonarperformance,thetotalheight
ofthetrunkmustbeascloseaspossibletoitsstatedminimum
height.
Thetopangemustbeparalleltotheconstructionwaterlinein
boththefore-and-aftandathwartshipdirections.
Theinstallationtrunkmustbeweldedtoadoublingplatewhich
mustbeatleast1.5timesasthickasthesurroundingshellplating.
Thedoublingplate’snaldimensionsaretobegovernedbythe
approvedinstallationdrawingssuppliedbytheshipyard.The
trunkmustalsobestiffenedbyweldingknee-platestoitandthe
doublingplateinboththefore-and-aftandathwartshipdirections.
Sonartrunkprotection
Protectingtheblister
Asteelblistermustbettedforprotection.Theblistershown
isweldedtotheshellplatingandthenlledwithoiltoprevent
corrosion.Thismethodprovidesexcellentprotectionand
simpliesmaintenance.
Corrosionprotection
Assoonasallinstallation,weldingandgrindinghasbeen
performed,thetrunkandthesurroundingareashouldbeprimed
andpaintedusingaqualityprotectivecoating.
Sonartrunkinstallationprinciples
Observethenexttwodrawings,theseillustratetheinstallation
ofthesonartrunk.
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