Simrad ES120-7C - INSTALLATION REV A User manual

Installation manual
Simrad ES120-7C
120 kHz split-beam transducer
TECHNOLOGY FOR SUSTAINABLE FISHERIES
www.simrad.com

SimradES120-7C
Installationmanual
Thisdocumentprovidesageneraldescriptionofhowto
installtheSimradES120-7CSplit-beamtransducer.The
informationmustberegardedasgeneralguidelinesand
recommendationsonly.Theinstallationshipyardmust
designandmanufactureinstallationhardwaretotthe
ES120-7Ctransduceroneachindividualvessel.
330254/A
20January2009

Documenthistory
Documentnumber:330254/ISBN-13:978-82-8066-106-7
Rev.AJanuary2006Firstversion.
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Disclaimer
KongsbergMaritimeASendeavourstoensurethatallinformationinthisdocumentiscorrectandfairly
stated,butdoesnotacceptliabilityforanyerrorsoromissions.
Warning
Theequipmenttowhichthismanualappliesmustonlybeusedforthepurposeforwhichit
wasdesigned.Improperuseormaintenancemaycausedamagetotheequipmentand/orinjury
topersonnel.Theusermustbefamiliarwiththecontentsoftheappropriatemanualsbefore
attemptingtoinstall,operateorworkontheequipment.
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Installationmanual
Tableofcontents
ABOUTTHISMANUAL.......................................................5
SIMRADES120-7C............................................................6
WHERETOMOUNTTHETRANSDUCER...............................7
HOWTOINSTALLTHETRANSDUCER..............................12
Transducerinstallationinblister............................................................................12
Transducerinstallationinboxkeel.........................................................................17
Transducerushmountedinasteeltank...............................................................19
Transducerwithacousticwindow..........................................................................20
Transducermountedinsidethehull.......................................................................21
Transducermountedonadropkeel.......................................................................23
Retractabletransducer............................................................................................24
TRANSDUCERCABLEGLANDSANDSPLICING.................25
Aboutcableglands.................................................................................................25
Cableglandforsteelhulls......................................................................................26
CableglandforwoodenandGRPhulls.................................................................27
Cableglandsforsmallhulls...................................................................................28
Transducercablesplicing.......................................................................................29
Ordernumbers........................................................................................................29
STEELCONDUIT..............................................................30
TRANSDUCERHANDLINGANDMAINTENANCE................31
Rulesfortransducerhandling.................................................................................31
Approvedanti-foulingpaints..................................................................................31
Usingself-lockingtaps...........................................................................................32
DRAWINGFILE...............................................................36
Echosounderconnections......................................................................................36
Splicingthetransducercable.......................................................................36
GeneralPurposeTransceiver(GPT)wiring...................................................37
GeneralPurposeTransceiver(GPT)transducerplugassembly.......................38
Outlinedimensionsandinstallationdrawings........................................................39
Outlinedimensions[204579].......................................................................40
Recommendedarrangement[204678]..........................................................41
Mountingring[204675]..............................................................................43
Clampingring[204677]..............................................................................45
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SimradES120-7C
4330254/A

Aboutthismanual
ABOUTTHISMANUAL
Purpose
Thepurposeofthisinstallationmanualistoprovidegeneric
descriptionsandillustrationsallowingthereadertounderstand
thebasicprinciplesforechosoundertransducerinstallation.
Abouttheinformationprovidedinthisdocument
Theinformationinthisdocumentmustberegardedasgeneral
guidelinesandrecommendationsonly.Theinstallationshipyard
mustdesignandmanufactureinstallationhardwaretoteach
individualtransducerandvessel.
Approvalbymaritimeauthorities
Wheneverrequired,theinstallationshipyardmustalsohavethe
installationapprovedbytheapplicablemaritimeauthorities.
Additionalinformation
Foradditionaldetailedinformationaboutthetransducerto
beinstalled,refertothedocumentationprovidedwiththe
transducer.Drawingsanddescriptionscanalsobeobtainedfrom
h
t t p : / / w w w . s i m r a d . c o m .
330254/A5

SimradES120-7C
SIMRADES120-7C
Thepurposeofthismanualistheprovidethebasicinformation
requiredtoinstalltheSimradES120-7CSplit-beamtransducer.
Transduceranddocuments
•SimradES120–7C:KSV-204580
•Productspecication:855–164381
•Drawings:
–Outlinedimensions:834-204579
–Mountingring:871–204675
–Clampingring:871–204677
–Mountingarrangement:820-204678
Note
Althoughdrawingsareprovidedtoexplaintheinstallation
principles,theinstallationshipyardmustprovidethenal
drawingsrequiredtotthetransducertoeachindividual
vessel.Also,whenapplicable,theinstallationshipyard
musthavethedrawingsandinstallationapprovedbythe
propermaritimeauthorities.Thedrawingsspecicfor
theES120-7CtransducerarelocatedintheDrawingle
onpage36.
Technicalspecications
RefertotheES120-7Cproductspecication.
Additionalpartsprovidedforinstallation
ThefollowingitemscanbesuppliedbySimradtofacilitate
installation:
•Mountingring:ES1–204719
•Clampingring:ES1–203672
•Transducercable(forextension):642–078215
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Wheretomountthetransducer
WHERETOMOUNTTHETRANSDUCER
Asingleanswertothequestionwheretolocatethetransducer
cannotbegiven.Itdependsverymuchonthevessel’s
construction,howthehullisshapedandhowthewaterruns
alongthehull.Therearehoweveranumberofimportantguide
lines,andsomeoftheseareevenconicting.
Mountthetransducerdeep
Mountthetransduceratadeeppositiononthehull.Considerthe
situationswhenthevesselisunloaded,andwhenitispitching
inheavyseas.
Thereareseveralreasonsforthis.
1Theupperwaterlayersoftheseacontainamyriadofsmall
airbubblescreatedbythebreakingwaves.Inheavyseasthe
upper5to10metresmaybelledwithair,andthehighest
concentrationswillbenearthesurface.Airbubblesabsorb
andreectthesoundenergy,andtheymayinworstcases
blockthesoundtransmissionaltogether.
2Anotherreasontogodeepisthecavitationinfrontof
highpowertransducers.Cavitationistheformationof
smallbubblesinthewaterduetotheresultinglocal
pressurebecomingnegativeduringpartsoftheacoustic
pressurecycles.Thecavitationthresholdincreaseswiththe
hydrostaticpressure.
3Thetransducermustneverbeliftedfreeofthewatersurface.
Transmittingintoopenairmaydamagethetransducer
beyondrepair.Mountingthetransduceratadeepposition
onthehullpreventsthis.
4Ifthetransducerisliftedupfromthewaterduringheavy
seas,itmaybedamagedwhenthehullstrikesbackatthe
seasurface.Thisisespeciallyimportantforlowfrequency
transducerswithlargefaces.
Mountthetransducermidwaybetweenthebow
andthesterntoavoidheaveeffects
Heaveistheupanddownmovementofthevessel.Itdisturbsthe
echotracesintheechogram,sothataatbottomisdisplayed
asawave.Atransducerlocationinthemiddleofthevessel
minimisestheinuenceofvesselrollandpitch.
Mountthetransducerawayfromprotruding
objectsonthehull
Objectsprotrudingfromthehull,suchaszincanodes,sonar
transducersoreventhevessel’skeel,generateturbulenceand
ownoise.Holesandpipeoutletsarealsoimportantnoise
sources.Theymayactasresonantcavitiesamplifyingtheow
330254/A7

SimradES120-7C
noiseatcertainfrequencies.Donotplaceanechosounder
transducerinthevicinityofsuchobjects,andespeciallynot
closebehindthem.Forthesamereason,itisveryimportant
thatthehullareaaroundthetransducerfaceisassmoothand
levelaspossible.Eventracesofsealingcompound,sharpedges,
protrudingboltsorboltholeswithoutllingcompoundwill
createnoise.
Mountthetransducerattheforwardpartofthe
hulltominimisetheeffectsfromtheboundary
waterlayer
Whenthevesselforcesitswaythroughthesea,thefriction
betweenthehullandthewatercreatesaboundarylayer.The
thicknessoftheboundarylayerdependsuponvesselspeedand
theroughnessofthehull.Objectsprotrudingfromthehull,and
dentsinthehull,disturbtheowandincreasethethicknessof
theboundarylayer.Theowinthisboundarylayermaybe
laminarorturbulent.Alaminarowisanicelyordered,parallel
movementofthewater.Aturbulentowhasadisorderlypattern,
fullofeddies.Theboundarylayerincreasesinthicknesswhenthe
owgoesfromlaminartoturbulent.Thegurebelowillustrates
theboundarylayerofavesselmovingthroughthewater.
Figure1Boundarywaterlayer
ATurbulentow
BLaminarow
CAirbubblesinthewater
Furthermore,airbubblesintheseawaterarepresseddownbelow
thehullandmixedintotheboundarylayer.Theboundarylayer
isthinunderneaththeforwardpartofthevessel,andincreasesin
thicknessasitmovestowardsaft.Ifthesidesofthehullaresteep,
someoftheairbubblesintheboundarylayermayescapetothe
seasurfacealongthevesselsides.Itisourexperiencethatawide
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Wheretomountthetransducer
andatbottom,witharisinganglelessthanaround13degrees,
ispronetogivingairproblemsforthetransducer.Inanycasea
transducerlocationintheforwardpartofthehullispreferredin
ordertominimisetheinuenceoftheboundarylayer.
Mountthetransducerfarawayfromthepropellers
Thepropulsionpropelleristhedominantnoisesourceonmost
shingvessels,researchvessels,merchantvesselsandpleasure
crafts.Thenoiseistransmittedthroughtheseawater.For
thisreason,thetransducershouldbeplacedfarawayfromthe
propeller,whichmeansontheforepartofthehull.Positions
outsidethedirectlineofsightfromthepropellerarefavourable.
Onsmallvesselswithshortdistancesitisadvisedtomountthe
transduceronthatsideofthekeelwherethepropellerblades
moveupwards,becausethepropellercavitationisstrongeston
theotherside.Thecavitationstartsmosteasilywhenthewater
owsinthesamedirectionasthepropellerblade,andthatisto
somedegreethecaseatthatsideofthekeelwherethepropeller
bladesmovedownwards.
Mountthetransducerfarawayfromthebow
thrusters
Bowthrusterpropellersareextremelynoisy.Wheninoperation,
thenoiseandcavitationbubblescreatedbythethrustermake
theechosounderuseless,almostnomatterwherethetransducer
isinstalled.Andwhennotinoperation,thetunnelcreates
turbulence,andifthevesselispitching,thetunnelmaybelled
withairoraeratedwaterintheupperpositionandreleasethisin
thelowerposition.Ingeneral,alltransducersmustbetherefore
placedwellawayfromthebowthruster.However,thisisnot
aninvariablerule.Certainthrusterdesignscombinedwithits
physicallocationonthehullmaystilloffersuitabletransducer
locationsnearthethruster.Ifyouareindoubt,consultanaval
architect.
Mountthetransducerwithaslightlyinclined
transducerface
Ideally,thetransducerfaceshouldbemountedinparallelwiththe
seasurfacewhenthevesselisinnormaltrim,asthiswillprovide
themostaccurateechoinformation.However,itisalsovery
importantthatthew
a t e r  o w overthetransducerfaceislaminar.
Inordertoensurelaminarow,thetransducerfacemaybetilted
slightlyupwardsinrelationtothewaterow.Thisallowsthe
owingwatertomeetthefacedirectly,andassureslaminarow.
Theinclinationanglemusthoweverbedeterminedcarefully.The
anglemustbesmallontransducerswithnarrowbeamangles.As
aruleofthumb,mounttransducerswithbeamanglessmaller
thansevendegreeswithminimuminclinationangle.Thesmaller
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SimradES120-7C
beamangleyourtransducerhas,thesmallertheinclinationangle
canbe.Ensurethatyoudonotmountthetransducerwitha
negativeinclinationangle.Thismaycauseturbulenceunderthe
transducerface,andreducedechosounderperformance.
Summaryandgeneralrecommendations
Someoftheaboveguidelinesareconicting,andeachcasehas
tobetreatedindividuallyinordertondthebestcompromise.
Generallythepropellernoiseisthedominantfactor,anda
recommendedtransducerlocationisintheforepartofthehull,
withmaximumdistancefromthebowequaltoonethirdofthe
totallengthofthehullatthewaterline.
Figure2Generalrecommendationfortransducerlocation
ATransducer
BInclinationangle
CHulllengthatwaterline
DMaximum1/3ofthehulllengthatwaterline(C)
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Wheretomountthetransducer
Ifthevesselhullhasabulbousbow,thismaywellbeagood
transducerlocation,butalsoheremustbetakenintoconsideration
theowpatternoftheaeratedwater.Oftentheforemostpart
ofthebulbispreferable.
Figure3Recommendedlocationofthetransduceronabulbous
hull
AThruster
BTransducerlocation
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SimradES120-7C
HOWTOINSTALLTHETRANSDUCER
Therearemanydifferentwaystomountthetransducer.These
aretherecommendedmethodstomountacirculartransducer.
Transducerinstallationinblister
Withatransducerwithcircularhousing,onerecommended
installationmethodisbyusingablister.Thetransducerblister
mustbedesignedandmanufacturedbytheinstallationshipyard
totthevessel’ssizeandhullshape.
Usemountingandclampingringswhenever
provided
Circulartransducersmaybeprovidedwithmountingand
clampingrings,orwithdrawingstoallowforlocalproduction
ofthese.Themountingringisweldedtotheholepreparedfor
thetransducer,whiletheclampingringtsaroundtheedgeof
thetransducerbody.Boltsthroughtheclampingringintothe
mountingringwillsecurethetransducerbetweenthem.Note
thatseveraltransducersusedirectionguidestoallowcorrect
mounting.
Smoothsurfaceisimportant
Mountingscrewsorboltsmustnotbeextrudingfromthe
transducerortheareaimmediatelyaroundit.Makesurethatthe
surfaceofthetransducerface,theinstallationhardwareusedto
mountit,thehullplatingandtheputtyaroundthetransduceris
asevenandsmoothaspossible.Obstructionsonthesesurfaces
willcreateproblemswithturbulentow.
Useahorizontalsupportbaronlargetransducers
Werecommendthatlargetransducersarettedwithahorizontal
supportbar.Thepurposeofthissupportbaristoprotectthe
transducerfromdamageintheeventofslamming.Thishappens
ifthevesselhullclimbsoutofthewaterinheavyseas.Theforce
ofthewaterwhenthehullfallsdownmaypushthetransducer
upandcausedamagetoitsmounting.Thesupportbarcanbe
securedtothemountingringusingthreadedrods.[1]
1.Slammingistheimpactofthebottomstructureofashipontotheseasurface.Itismainlyobserved
whilesailinginwaves,whenthebowraisesfromthewaterandsubsequentlyimpactsonit.Slamming
inducesextremelyhighloadstoshipstructuresandistakenunderconsiderationwhendesigningships.
(Wikipedia)
12330254/A

Howtoinstallthetransducer
Example:Largetransducer
Theillustrationbelowshowsatypicaltransducerblisterdesigned
foralargetransducer.Notethatduetothephysicalsizeof
thetransducer,aU-shapedsupportbar(E)isusedtosupport
thetransducer.Thepurposeofthissupportistopreventthe
transducerfrombeingpushedupintotheblisterinheavyseas.
(CD017010A)
H
E
E
K
G
B
D
A
C
F
J
I
AStreamlinedblister
BStiffeningrib
CDrainageholes
DInclinationangle
EU-shapedsupportbar(onlargetransducers)
FForward
GCableserviceloop
HStufngtube
IMinimum400mm
JRoundedcorners
KAiroutlet
330254/A13

SimradES120-7C
Example:Smalltransducer
Theillustrationbelowshowsatypicaltransducerblisterdesigned
forasmalltransducer.Thesameblisterdesignprinciplesasfora
largetransducerapply.
EE
A
C
G
D
F
B
(CD017010B)
AStreamlinedblister
BMountingring
CClampingring
DGuide
EAiroutlet
FForward
GTransducercable
Notethatthetransducercablemustbeprovidedwithacableloop
insidetheblister.Observetheverticalforwardedgeoftheblister.
Thiswillguidethewatertoeachsideoftheblister.
14330254/A

Howtoinstallthetransducer
Example:Mediumsizedtransducerwithout
clampingring
Theillustrationbelowshowsatransducerblisterdesignedfora
mediumsizedtransducers.Thesameblisterdesignprinciples
apply.Notethatthetransducerismountedwithoutaclamping
ring,whichmakesitnecessarytouseadifferentmountingring
design.
A
B
C
H
F
EE
G
D
I
(CD017010E)
AStreamlinedblister
BMountingring
CBolt
DSelf-lockingthreads
EAiroutlet
FForward
GTransducercable
HTransducer
Notethatthetransducercablemustbeprovidedwithacableloop
insidetheblister.Observetheverticalforwardedgeoftheblister.
Thiswillguidethewatertoeachsideoftheblister.
330254/A15

SimradES120-7C
Commonguidelines
Thebestperformanceisobtainedwithablisterheightof40cm
ormore.Astreamlinedshapeandroundededgesreducetheow
noise.Averticalleadingedgeorfrontwillguidetheaerated
watertothesidesoftheblister.Theorientationoftheblister
shouldfollowthewaterow.
Theinterioroftheblistermustbelledwithseawater.Use
drainageholesinthebottomandanairoutletonthetop.The
waterpressurebehindthetransducerwillthencompensatefor
theoutsidepressureduringvesselmovementsinroughsea.
Werecommendthatlargediametertransducersarettedwitha
horizontalU-shapedsupportbar.Thisbarcanthenbesecured
tothemountingringusingthreadedrods.
Thetransducercablepenetratesthehullinastufngtube.Leave
anadequateloopofthecablebehindthetransducerforeasy
mountingorremovalofthetransducer.
Toe-in
Theprimaryconsiderationmustbetoallowlaminarwaterow.
Inmostcasesthisisachievedbydesigningtheblisterinparallel
withthekeel.However,iftheblisterislocatedclosetothebow,
thefrontoftheblistermayhaveafewdegreestoe-intowards
thebow.
(CD17010C)
A
B
C
AKeel
BBlister
CToe-inangle
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Howtoinstallthetransducer
Physicallocation
Theblisterisplacedononeofthesidesofthehull,andthe
distancefromthekeelisatradeoffbetweenaclosedistance
givingaturbulentowofwaterinanarrowpassage,andalarge
distancebringingthetransducerhigherupandalsomoreaffected
byvesselroll.Normallyadistanceofapproximately1misa
goodcompromise.
Observethehorizontalandverticaldistances(CandD)between
thekeelandthetransducerblister.Onamediumsizedvessel,the
horizontaldistance(C)shouldbeapproximately1meter.The
verticaldistance(D)mustingeneralbeassmallaspossible.This
isimportanttopreventthekeelfromshadowingthetransducer
beaminshallowwaters.
AKeel
BTransducer
blister
CHorizontal
distance
betweenkeel
andblister
DVertical
distance
betweenthe
blistersurface
andthekeel
Transducerinstallationinboxkeel
Vesselswithaboxkeelmayusethisfortransducerinstallation.
Theboxkeelisalreadythedeepestpartofthevessel.Ifthe
boxkeelistoonarrowtoaccommodatethetransducer,itcanbe
widened,eithersymmetricallyortoonesideonly.Inthelast
casetheinstallationcouldalsobedescribedasablistermerged
intothekeel.
Usemountingandclampingringswhenever
provided
Circulartransducersmaybeprovidedwithmountingand
clampingrings,orwithdrawingstoallowforlocalproduction
ofthese.Themountingringisweldedtotheholepreparedfor
thetransducer,whiletheclampingringtsaroundtheedgeof
330254/A17

SimradES120-7C
thetransducerbody.Boltsthroughtheclampingringintothe
mountingringwillsecurethetransducerbetweenthem.Note
thatseveraltransducersusedirectionguidestoallowcorrect
mounting.
Smoothsurfaceisimportant
Mountingscrewsorboltsmustnotbeextrudingfromthe
transducerortheareaimmediatelyaroundit.Makesurethatthe
surfaceofthetransducerface,theinstallationhardwareusedto
mountit,thehullplatingandtheputtyaroundthetransduceris
asevenandsmoothaspossible.Obstructionsonthesesurfaces
willcreateproblemswithturbulentow.
Useahorizontalsupportbaronlargetransducers
Werecommendthatlargetransducersarettedwithahorizontal
supportbar.Thepurposeofthissupportbaristoprotectthe
transducerfromdamageintheeventofslamming.Thishappens
ifthevesselhullclimbsoutofthewaterinheavyseas.Theforce
ofthewaterwhenthehullfallsdownmaypushthetransducer
upandcausedamagetoitsmounting.Thesupportbarcanbe
securedtothemountingringusingthreadedrods.[2]
Example:Boxkeelinstallation
Thegurebelowillustratesasymmetricalboxkeelinstallation.
ABoxkeel
BU-shaped
supportbar
(onlyrequired
onlarge
transducers)
CStufngtube
DCableinsteel
conduit
ECableservice
loop
(CD1701 1A)
A
B
D
C
E
2.Slammingistheimpactofthebottomstructureofashipontotheseasurface.Itismainlyobserved
whilesailinginwaves,whenthebowraisesfromthewaterandsubsequentlyimpactsonit.Slamming
inducesextremelyhighloadstoshipstructuresandistakenunderconsiderationwhendesigningships.
(Wikipedia)
18330254/A