船舶工艺english.docx
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船舶工艺english.docx
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船舶工艺english
TechnicalServiceDept.
Contents
1.Inspector'sRole--------------------------------------------
(1)
2.TheNameofShipStructure----------------------------------
(2)
3.TypesofShip-----------------------------------------------(3)
4.BuildingProcessforNew-BuildingShip----------------------(4)
4-1)Classificationofpaintingworkstages
4-2)Paintingprocedure
5.Builder's(HHT's)generalpaintingprocess------------------(7)
6.CheckList----------------------------------------------(8-9)
6-1)Steelsurfacepreparation
6-2)Shopprimer
6-3)Secondarysurfacepreparation
6-4)Beforesubsequentcoating
6-5)Afterblockerection
6-6)Afterfinalcoatingonship'sbottom
7.Surfacepreparation------------------------------------(10-15)
7-1)Introduction
7-2)Surfacepreparationstandards
7-3)Whatismillscale?
7-4)Rust
7-5)ISO8501-1
8.PaintandPaintApplication-----------------------------(16-30)
8-1)Introduction
8-2)Whatdoesapaintconsistofingeneral?
8-3)Typesofpaint
8-4)Paintapplication
8-5)Typesofcoatingadhesion
8-6)Methodofcure
8-7)EnvironmentConditionbeforepainting
9.Coatingfailures,causes&remedies----------------------(31-42)
9-1)Introduction
9-2)representativefailuresofcoating
10.Appendix------------------------------------------------(43-47)
10-1)Ship'sTonnageMeasurement
10-2)InspectionTools
10-3)CalculationoftheFilmThickness
10-4)CalculationofthePaintConsumption
10-5)CalculationoftheTemperature
10-6)CalculationofthePressure
10-7)Calculationofthelengh&AreaConversionFactors
1.TechnicalAdviser’sRole
Theterm'inspector'hereistakentocoverthepersonactuallycarryingoutthework,butonlargerprojectsateamofinspectorsmaybeinvolvedandtheorganizationresponsiblefortheinspectionmayprovidedifferentinspectorsforspecificpartsofthework.Tosimplifythediscussionthisisalsocoveredbytheterm'inspector'.Basically,theinspectormusthavetherequiredtechnicalcompetencefortheworkbut,inviewofthenatureoftheworkhehastocarryout,therearealsopersonalityrequirements.Oftentheinspectorisworkingonhisownandbecauseheisinvolvedonlywithqualitythereisabasishereforpotentialconflictwiththoseattemptingtocompletetheworkontime,i.e.thecontractors.Hemust,therefore,beadeptinhumanrelationships,capableofcommunicatinginaclearandconcisemannerandbecapableofresistingpressuretoacceptstandardsbelowthoserequired.Heshouldhaveagoodknowledgeofthecoatingsindustryand,mostimportant,shouldbeproperlytrainedfortherolehehastoundertake.
Asinalljobs,someinspectors,throughexperience,knowledgeandpersonality,areabletoachievemorethanothers.However,suchqualitiesarenotuniversalandprovidingtheinspectoristechnicallycompetentandunderstandshisresponsibilities,hewillbecapableofcarryingouthisworksatisfactorily.Itisimplicitthatallinspectors,bythenatureoftheirwork,mustbetrustworthyandconscientious.
2.TheNameofShipStructure
*Thenameofpartsandsectionsofship
3.Typesofship
4.Buildingprocessfornew-buildingship
4-1)Classificationofpaintingworkstages
4-2)Paintingprocedure
4-2-1)ShopprimerStage
(A)ConceptofPrimarySurfacePreparation&Shopprimer
Themainfunctionofshopprimingistoprovidehullstructuralsteelwithtemporary
protectionfromrustingduringfabrication.
Thesteelplateisprimedintheautomaticpre-treatmentshopbypre-heatingshot
blastingandshopprimingwhileitpassesthroughconveyorline.
(B)Generalprocessofpre-treatment
*Ifanylocalpaintholidayisdetected,manualsprayapplicationshouldbeimmediatelyoperated
(C)SteelConditionsforshopprimercoating
4-2-2)Blockstage
(A)Secondarysurfacepreparation
ⓐGreasyresiduesareremovedandthinner-cleaned.
ⓑAppropriatemaskingiscarriedoutfornon-ferrousmetals,sensitive
machineriesetc.,ifnecessary.
ⓒPowertoolingorblastingiscarriedoutaccordingtothegradeofbuilder's
specificationfordamagedorburntarea.
ⓓGrit-recoveryequipmentisusedandtheremainsarecleaned.
ⓔBlasting-missedareas,corners,scallopsaretreatedbypowertooling.
ⓕForeignmaterialsarecleanedbyairblowing,sandpaperingandwirebrushing
etc.
(B)Firstcoatapplication
ⓐFirstcoatapplicationiscommencedsooneraftersteelsurfacepreparation
beforevisualrustoccurs.
ⓑTheblockshavingconfinedspacesareproperlyventilated.
ⓒBrushtouch-upisperformedonroughmanualweldingbeads,scallops,
corners,holesandholidaysetc.
(C)Subsequentcoatsapplication
ⓐDryfilmthicknessismeasuredonpreviouscoatsbeforesubsequentcoating.
ⓑRecoatingintervalshouldbekeptbetweencoatings,ifrecoatingintervalis
over,subsequentcoatshouldbeappliedafterproperlytreatingthesurface
inaccordancewithpaintmanufacturer'srecommendation.
(D)FinalInspection
ⓐTotaldryfilmthicknessischecked.
ⓑGeneralappearance,touch-upconditionandpaintfailureetc.arechecked.
4-2-3)Dockandquaystage
(A)Foroutsideshell,areasupportedonthepedestalatblockstage,damagedarea,baresteelanderection-linesarerepaired.
Fortanksandothercompartmentspaceetc.,erection-lines,baresteel,mechanicalorfiredamagesarerepaired.
(C)Damagesofoutfittingarerepaired.
(D)Topcoatsareappliedasspecification.
(E)Bottomsurveyiscarriedoutjustbeforelaunching.
(F)Tankfinalinspectioniscarriedoutformanholeclosing.
(G)Otherareassuchashold,pipeduct,cofferdamandengineroometc.arefrequently
checkedundersupervisor'spatrolling.
5.Builder's(HHI's)generalpaintingprocess
▶Workingproceduresoneachworkingstageissubjectedtoyard’sworkingschedule.
6.Checklist
6-1)Steelsurfacepreparationatprefabricationshop
①Thedegreeofsurfacecleaningafterremovingmillscale,rust,oilandother
foreignmaterials.
②Thetemperatureofsteelsurface.
③Thedryconditionofsteelsurface.
④Cleaningconditionofblastedsteelsurface.
6-2)Shopprimer
①Theconditionofstorageofpainttobeused.
②Mixingandthinningratioofpaint.
③Dryfilmthickness.
④Paintholidayparts.
⑤Appearanceofpaintfilmsurfaceaftershoppriming.
6-3)Secondarysurfacepreparation
1Thedegreeofblastcleaningforweldinglineanddamagedpartsofshopprimed
surface.
②Removingofslugs,spatters,oilandotherforeignmaterials.
③Theconditionofgrindingforsharpedge.
④Removingofzincsaltandrerust.
⑤Cleaningcondition.
⑥Theconditionofstorageofpainttobeused.
⑦LotNo.ofusedpaint.
⑧Mixingconditionandthinningratioofpaint.
⑨Weathercondition.
6-4)Beforesubsequentcoating
①Dryfilmthickness.
②Dryspray.
③Mechanicaldamageandburntdamage.
④Touch-upconditionbeforemaincoatingforcorner,edge,backsideoflongitudinal
angles,holesandweldingline.
⑤Conditionofpaintstorage.
⑥Cleaningcondition.
⑦Paintadhesioncondition.
⑧Weathercondition.
6-5)Afterblockerection
①Repairedconditionfordamagedareasduetoweldingwork.
②Weldingdefect.
③Featheringwork.
④Removingconditionofweldingfume,oilandotherforeignmaterials.
6-6)Afterfinalcoatingonship'sbottom
①Totaldryfilmthickness.
②Hullroughness.
③Generalappearance.
④Immersiontimeforlaunching.
7.Surfacepreparation
Generally,thesurfacetobecoatedmustbecleanedofgrease,dirtandmoisture,althoughithasbeenclaimedforsomerecentlydevelopedepoxycoatingmaterialsthatsuchcleaningisnotalwaysnecessary.Thelong-termperformanceofacoatingissignificantlyinfluencedbyitsabilitytoadhereproperlytothematerialtowhichitisapplied.Thisisnotsimplybecausethecoatingmightflakeawayordetachfromthesurfacebutbecausepooradhesionwillallowmoistureorcorrosionproductstoundercutthecoatingfilmfromareasofdamage.
Steelisdifferentfromothermaterialsinthisrespectbutadditionalrequirementsofsurfacecleanlinesshavealsotobetakenintoaccount.Thesearisefromthemanufacturingprocesswhere,becauseofthetemperatureatwhichsteelisrolledtoshape,reactionsoccurbetweenthehotsteelandoxygenintheairtoformoxidescalestermedmillscaleso-calledbecauseitresultsfromoperationsintherollingmill.
Thepresenceofmillscalecausesspecialproblemsandforsoundcoatingperformanceitmustberemoved.Rustonthesteelsurfacealsoaffectsthedurabilityofprotectivecoatings,sothismustalsoberemovedifgoodcoatingperformanceistobeachieved.
Thestateofthesurfacepriortocoatingisoneofthemostsignificantfactorsindeterminingtheperformanceofprotectivefilmsandexpensive,potentiallydurable,coatingsmaywellfailprematurelyifappliedtosurfacesthathavebeeninadequatelycleaned.Thesurfacepreparationofsteelhas,therefore,becomeincreasinglyimportantwiththedevelopmentofhighdutycoatingsthatrequireahighlevelofadhesiontothesteelsurfaceinordertoachievetheirfullprotectivepotential.
7-1)Introduction
Thelifeofacoatingdependsasmuchonthedegreeofsurfacepreparation
Importanceofasonthesubsequentcoatingsystem
surfacepreparationNopaintsystemwillgiveoptimumperformanceoverapoorlypreparedsurface.
Paintoverrust,greaseorcontaminatedsurfacescanbewastefulintermsoftime
andmaterial.Allpaintsystemfailprematurelyunlessappliedoverasuitably
preparedsurface.
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