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pickling and passivating of stainless steel systems and installations

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Services (http://www.vecom group.com/en/services/) Stainless steel services (http://www.vecom group.com/en/services/stainless steel/) Carbon steel services (http://www.vecom group.com/en/services/carbon steel/) Aluminium services (http://www.vecom group.com/en/services/aluminium/) Other alloys (http://www.vecom group.com/en/services/other alloys/) Cooler & Filter cleaning (http://www.vecom group.com/en/services/cooler filtercleaning/) On site services (http://www.vecom group.com/en/services/on siteservices/) Precommissioning cleaning (http://www.vecom group.com/en/services/onsite services/precommissioning cleaning/) Postcommissioning cleaning (http://www.vecom group.com/en/services/onsite services/postcommissioning cleaning/) Preservation (http://www.vecom group.com/en/services/onsite services/preservating/) Pickling and passivating of stainless steel systems and installations Stainless steel systems and installations are cleaned prior to use and in many cases periodically to remove process contaminants such as scaling. Metal treatment Stainless steel must prior to use be chemically treated. The corrosion resistance of stainless steel is determined by a chromiumrich oxide film. As soon as this film has formed the material is designated as being passive. During installation of the stainless steel piping in a system and/or installation the surface is exposed to many mechanical and thermal treatments. This results in local damage to and contamination of the protective oxide film. Then this results in the oxide film losing its corrosion resistant features with the substrate material often corroding more rapidly than would have been the case for the original passive panel material. It is therefore very important that this chromiumrich oxide film is completely sealed and clean before the system/installation is put into use and exposed to chemicals/process and environment. Corrosion Stainless steel is not completely resistant to corrosion. It is important that light corrosion products be removed specifically with a view to avoiding deep pit and split corrosion with all their negative consequences and also to prevent contamination the process / medium in the installation/system. Precommissioning cleaning The precommissioning cleaning of Austenitic stainless steel types comprises in general three steps: degreasing, pickling and passivation. Degreasing is required to remove oil, grease and atmospheric pollution and to render the surface optimally accessible to the pickling agent. Degreasing is generally conducted using Vecom Multicleaner/TP02 or Steamclean HPCNF. The pickling treatment removes completely iron particles and other surface contaminants to the surface resulting from earlier treatments or otherwise. After the pickling treatment the material is rinsed acidfree using lowchloride water. The pickling treatment renders the surface chromiumrich, the surface being in fact refined. Although the Austenitic stainless steel is, after pickling and when exposed to sufficient atmospheric oxygen, able to passivate spontaneously, closed systems such are generally treated chemically in order to passivate their surfaces. The chemical fluids are circulated through the installation/system. This is done using an acidresistant pump unit. The time CONTACT US by email: [email protected] (mailto:[email protected]) or call us on +31 (0)10 5930212 (http://www.vecomgroup.com/en/) EN NL Home (http://www.vecomgroup.com/en/) Products (http://www.vecomgroup.com/en/products/) Services (http://www.vecomgroup.com/en/services/) Downloads (http://www.vecomgroup.com/en/downloads/) Contact (http://www.vecomgroup.com/en/contact/) Login (http://network.vecomgroup.com) Search at Vecom On site services

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  • Services(http://www.vecomgroup.com/en/services/)

    Stainlesssteelservices(http://www.vecomgroup.com/en/services/stainlesssteel/)

    Carbonsteelservices(http://www.vecomgroup.com/en/services/carbonsteel/)

    Aluminiumservices(http://www.vecomgroup.com/en/services/aluminium/)

    Otheralloys(http://www.vecomgroup.com/en/services/otheralloys/)

    Cooler&Filtercleaning(http://www.vecomgroup.com/en/services/coolerfiltercleaning/)

    Onsiteservices(http://www.vecomgroup.com/en/services/onsiteservices/)

    Precommissioningcleaning(http://www.vecomgroup.com/en/services/onsiteservices/precommissioningcleaning/)

    Postcommissioningcleaning(http://www.vecomgroup.com/en/services/onsiteservices/postcommissioningcleaning/)

    Preservation(http://www.vecomgroup.com/en/services/onsiteservices/preservating/)

    Pickling and passivating of stainlesssteel systems and installationsStainlesssteelsystemsandinstallationsarecleanedpriortouseandinmanycasesperiodicallytoremoveprocesscontaminantssuchasscaling.

    MetaltreatmentStainlesssteelmustpriortousebechemicallytreated.Thecorrosionresistanceofstainlesssteelisdeterminedbyachromiumrichoxidefilm.Assoonasthisfilmhasformedthematerialisdesignatedasbeingpassive.

    Duringinstallationofthestainlesssteelpipinginasystemand/orinstallationthesurfaceisexposedtomanymechanicalandthermaltreatments.Thisresultsinlocaldamagetoandcontaminationoftheprotectiveoxidefilm.Thenthisresultsintheoxidefilmlosingitscorrosionresistantfeatureswiththesubstratematerialoftencorrodingmorerapidlythanwouldhavebeenthecasefortheoriginalpassivepanelmaterial.Itisthereforeveryimportantthatthischromiumrichoxidefilmiscompletelysealedandcleanbeforethesystem/installationisputintouseandexposedtochemicals/processandenvironment.

    CorrosionStainlesssteelisnotcompletelyresistanttocorrosion.Itisimportantthatlightcorrosionproductsberemovedspecificallywithaviewtoavoidingdeeppitandsplitcorrosionwithalltheirnegativeconsequencesandalsotopreventcontaminationtheprocess/mediumintheinstallation/system.

    PrecommissioningcleaningTheprecommissioningcleaningofAusteniticstainlesssteeltypescomprisesingeneralthreesteps:degreasing,picklingandpassivation.Degreasingisrequiredtoremoveoil,greaseandatmosphericpollutionandtorenderthesurfaceoptimallyaccessibletothepicklingagent.DegreasingisgenerallyconductedusingVecomMulticleaner/TP02orSteamcleanHPCNF.Thepicklingtreatmentremovescompletelyironparticlesandothersurfacecontaminantstothesurfaceresultingfromearliertreatmentsorotherwise.Afterthepicklingtreatmentthematerialisrinsedacidfreeusinglowchloridewater.Thepicklingtreatmentrendersthesurfacechromiumrich,thesurfacebeinginfactrefined.AlthoughtheAusteniticstainlesssteelis,afterpicklingandwhenexposedtosufficientatmosphericoxygen,abletopassivatespontaneously,closedsystemssucharegenerallytreatedchemicallyinordertopassivatetheirsurfaces.Thechemicalfluidsarecirculatedthroughtheinstallation/system.Thisisdoneusinganacidresistantpumpunit.Thetime

    CONTACTUS

    byemail:[email protected](mailto:[email protected])orcalluson+31(0)105930212

    (http://www.vecomgroup.com/en/)EN

    (HTTP://WWW.VECOM

    GROUP.COM/EN/)

    NL

    (HTTP://WWW.VECOM

    GROUP.COM/NL/)Home(http://www.vecomgroup.com/en/) Products(http://www.vecomgroup.com/en/products/)Services(http://www.vecomgroup.com/en/services/)Downloads(http://www.vecomgroup.com/en/downloads/)Contact(http://www.vecomgroup.com/en/contact/) Login(http://network.vecomgroup.com)

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  • CleaningofUreastrippers(http://www.vecomgroup.com/en/services/onsiteservices/cleaningofureastrippers/)

    Picklingandpassivatingofstainlesssteelsystemsandinstallations(http://www.vecomgroup.com/en/services/onsiteservices/picklingandpassivatingofstainlesssteelsystemsandinstallations/)

    Treatmentofstainlesssteelchemicaltankersandstoragetanks(http://www.vecomgroup.com/en/services/onsiteservices/treatmentofstainlesssteelchemicalientankersandstoragetanks/)

    Derougingofhighpuritywatersystemsinthepharmaceuticalsector(http://www.vecomgroup.com/en/services/onsiteservices/derougingofhighpuritywatersystemsinthepharmaceuticalsector/)

    Oxygencleanspec(http://www.vecomgroup.com/en/services/onsiteservices/oxygencleanspec/)

    PipePigging(http://www.vecomgroup.com/en/services/onsiteservices/pipepigging/)

    Marineservices(http://www.vecomgroup.com/en/services/marineservices/)

    Rentalequipment(http://www.vecomgroup.com/en/services/rentalequipment/)

    occupiedbythistreatmentdependsonthetypeofstainlesssteelandthetemperature.Analysesoftheironcontentandacidconcentrations,determinewhenthetreatmentisfinished.Thetreatmentisfollowedbyrinsing,firstwithdrinkingwaterandthenwithdemineralizedwater.

    Technical BulletinVecomkeepsyouinformedonthevariousaspectsofsurfacetreatment,cleaningandmaintenance.GototheTechnicalBulletinpageandreadmore(http://www.vecomgroup.com/en/downloads/technicalbulletin/)

    Links(http://www.vecomgroup.com/en/links/)|News(http://www.vecomgroup.com/en/news/)|Events(http://www.vecomgroup.com/en/events/)|Environment&quality(http://www.vecomgroup.com/en/environmentquality)|Jobs(http://www.vecomgroup.com/en/workingatvecom)

    About usVecom,foundedin1953,isafamilyownedcompanywithitsrootsintheMaritimeindustry.Vecomoffershercustomersadynamicapproachandpracticalsolutionsincleaning&maintenanceproducts.Sincethe90ieswealsoofferawiderangeof(chemical)metalsurfacetreatments.Readmore(http://www.vecomgroup.com/en/aboutus/)

    2015VecomGroup(http://www.vecomgroup.com).Allrightsreserved Subscribetonews(http://www.vecomgroup.com/en/feed/) VecomatLinkedIn(http://www.linkedin.com/pub/vecomgroupbv/51/20/bb5)


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