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442703/B

127

Aboutthehullunitinstallation

ThehullunitprovidedwiththeST90isdesignedtolowerthetransducerdownbelowthe

ship’shullwhentheST90shallbeused.WhentheST90isswitchedoff,thetransducer

ishoistedforprotection.Thehullunitisalargeandcrucialpartofthesonarsystem.

Note

Duetoitsphysicalsizeandweight,andthefactthattheinstallationtrunkpenetrates

thevesselhull,itisveryimportantthatthehullunitisinstalledandsecuredproperly.

Thehullunitgantrymustbesecuredtothebulkheadbymeansofmechanicalsupport

brackets.Thedimensionsandstrengthofthesupportbracketsmustbeadequateto

preventvortexinducedvibration.ThisarequirementtoensurethesafetyoftheST90

andthevessel.

Thehullunitshallbemountedontopoftheinstallationtrunkatthebottomofthehull.

Theinstallationtrunkpenetratestheship’shull,andallowsthetransducertobelowered

intothesea.Thehullunitisnormallylocatedintheforwardpartofthevessel.

Asageneralrecommendation,thehullunitshallbeorientedwiththehoist/lowermotor

pointingaft

.IfthisorientationmakesitdifculttoaccesstheMotorControlUnit,the

hullunitmayberotatedduringitsinstallationtothemostsuitabledirection.

Relevantcranesandliftingequipmentmustbeavailable.Freeaccessthroughthehullor

thedecksontothetopoftheinstallationtrunkmustbeprovided.

Topics

Mechanicalsupportbrackets,page127

O-ring,page128

Designandinstallationdrawings,page129

Hullunitinstallationexample:T opview,page130

Hullunitinstallationexample:Sideview,page131

Hullunitinstallationexample:Sideview,page132

Mechanicalsupportbrackets

Duetoitsphysicalsizeandweight,andthefactthattheinstallationtrunkpenetratesthe

vesselhull,itisveryimportantthatthehullunitisinstalledandsecuredproperly.

Note

Thehullunitgantrymustbesecuredtothebulkheadbymeansofmechanicalsupport

brackets.Thedimensionsandstrengthofthesupportbracketsmustbeadequateto

preventvortexinducedvibration.ThisarequirementtoensurethesafetyoftheST90

andthevessel.

Installingthehullunit

Simrad ST90 Installation Manual

Other manuals for Simrad ST90