1、BRITISH STANDARD BS EN 12501-2:2003 Protection of metallic materials against corrosion Corrosion likelihood in soil Part 2: Low alloyed and non alloyed ferrous materials The European Standard EN 12501-2:2003 has the status of a British Standard ICS 77.060 BS EN 12501-2:2003 This British Standard was
2、 published under the authority of the Standards Policy and Strategy Committee on 6 May 2003 BSI 6 May 2003 ISBN 0 580 41779 4 National foreword This British Standard is the official English language version of EN 12501-2:2003. The UK participation in its preparation was entrusted to Technical Commit
3、tee ISE/NFE/8, Corrosion of metals and alloys, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this documen
4、t may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Us
5、ers are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for chang
6、e, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright date
7、 displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN125012 April2003 ICS77.060 Englishversion ProtectionofmetallicmaterialsagainstcorrosionCorrosion likelihoodinsoilPart2:L
8、owalloyedandnonalloyedferrous materials Protectiondesmatriauxmtalliquescontrelacorrosion RisquedecorrosiondanslessolsPartie2:Matriaux ferreuxpeuounonallis KorrosionsschutzmetallischerWerkstoffe KorrosionswahrscheinlichkeitinBdenTeil2:Niedrigund unlegierteEisenwerkstoffe ThisEuropeanStandardwasapprov
9、edbyCENon21February2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtothe
10、ManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationa
11、lstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRN
12、ORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN125012:2003EEN125012:2003(E) 2 Contents page Foreword3 Introduction .4 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Assessment
13、ofthecorrosionloadinsoilforanewstructuretobeburied 4 4.1 Method 4 4.2 Criteria.5 4.2.1 Soilconditions . 5 4.2.2 PreliminaryInquiry . .5 4.2.3 Sitesurvey. .5 4.2.4 Soilsampling. .6 4.2.5 Backfillmaterials .7 5 Complementaryinformationforanexistingstructure. 7 5.1 General7 5.2 Investigationsandanalysi
14、s . .8 AnnexA (informative) Procedureforassessingthecorrosionloadinsoilinthecaseofanew structure9 AnnexB (informative) Generalprinciplesofsoilstudies10EN125012:2003(E) 3 Foreword Thisdocument(EN125012:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC262“Metallicandother inorganiccoatings”,thesecretaria
15、tofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyOctober2003,andconflictingnationalstandardsshallbewithdrawnatthelatest byOctober2003. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardso
16、rganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN125012:2003(E) 4 Introdu
17、ction ThisEuropeanStandardshouldbeusedinconjunctionwithEN125011, Protectionofmetallicmaterialsagainst corrosionCorrosionlikelihoodinsoil Part1: General, whichdescribesgeneralprinciplesoftheassessmentof thecorrosionload. Themethodofassessingthecorrosionloadinthecaseofanewstructuretobeinstalledtakesin
18、toaccountthe adverseparametersofthesoilandenvironmentwithregardtocorrosion.Theyhavebeenchosentoavoid underestimationoftherisksofcorrosiondamage.Theassessmentisperformedconsideringabarestructurein directcontactwiththesoilwithouttakingintoaccountanyprotectivesystemthatwillbepresentinservice. Thecomple
19、xityofcorrosioninsoildemandsthatthemeasurementsandtheirinterpretationarecarriedoutby experiencedpersonnel.Thedescribedmethodshouldbeadaptedinrelationtotheexpectedservicelifeofthe structureandtopossiblefuturechangesofitsenvironment. 1Scope ThispartofthisEuropeanStandarddealswiththeassessmentofthecorr
20、osionloadinsoilforlowalloyedandnon alloyedferrousmaterialsindirectcontactwithsoil.Corrosionprotectionsystemsandtheirperformancearenot coveredbythisstandardbutbyspecificproductsstandards. ThispartofthisEuropeanStandarddealswiththecaseofnewstructurestobeburiedandgivesinformationfor existingstructures.
21、 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytot
22、hisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN125011:2003,ProtectionofmetallicmaterialsagainstcorrosionCorrosionlikelihoodinsoilPart1: General. 3 Termsanddefinitions Forthepurposesofthi
23、sEuropeanStandard,thetermsanddefinitionsgiveninEN125011:2003apply. 4 Assessmentofthecorrosionloadinsoilforanewstructuretobeburied 4.1Method Themethodtobeappliedisbasedon: generalconceptsandfactorsinfluencingthecorrosionloadgiveninEN125011; criteriadefinedinthepresentstandard.EN125012:2003(E) 5 Theco
24、rrosionloadisacceptedhighifnoinvestigationisdoneforanyreason. 4.2Criteria 4.2.1Soil conditions Table1summarisesdifferentsoilconditionstobeexaminedduringeitherthepreliminaryinquiryorthesitesurvey andwhichindicatealocationofhighcorrosionload,intheabsenceoffurtherinvestigation. Table1soilconditionsthat
25、canleadtoahighcorrosionload Characteristics Circumstances Examplesofcriteria Typeofsoil Naturalsoil Presenceofpeat,lignite,coalinthesoils Areassuchasmarsh,fen, Tidalzone Presenceofbrackishorseawatertable Anaerobicsoils(PossibleMicrobiallyInducedCorrosion) Artificialsoil Soilscontainingashes,slag,ind
26、ustrialbyproducts,residues ofhouseholdrefuse,. Areasbackfilledbyindustrialbyproducts(anytype) Uncontrolledrecycledmaterials Electricalinfluence DeviceusingDC ClosevicinityofDCrailways,tramways,underground,. Proximityofacathodicallyprotectedstructure,oranodes,. DeviceusingAC ProximityofACpowerlines,A
27、Crailways ProximitytoACearthingelectrodes Pollution Contaminatedsoils Contaminationbydeicingsalts,manure,fertilisers,leaking sewer,industrialpollution TopographyHydrography Presenceonthepiperouteofalowpoint,acreekorriver crossing,. Others Toponomy Indicationsfromthevillagenamesofspecialcharactersoft
28、he natureofsoil Threephaseboundary Fluctuatingwatertable 4.2.2Preliminary Inquiry Apreliminaryinquirygenerallyconsistsofatopographicalstudy,ageologicalstudyandaninvestigationforspecific information.Itenablestoidentifyareaswhichshouldbestudiedwithparticularattentionduringthesitesurvey. AnnexBgivesmor
29、edetailedinformationonthewaytocollectdataduringthepreliminaryinquiry. Intheabsenceoffurtherinvestigation,suchassitesurveyorsoilsampling,andifoneormorecriteriaasgivenin table1aremetcorrosionloadisacceptedhigh. 4.2.3 Sitesurvey Asitesurveyconsistsincollectingadditionalinformation(seeTable1)byobservati
30、onsandmeasurementsonthe constructionsite;soilresistivitymeasurementshavetobeperformedand,whenappropriate,potentialgradient measurements. AnnexBgivesadditionalinformationonthewaytocarryoutasitesurvey. Thefollowingcriteriaallowtoassessthecorrosionload,basedonvisualinspectionofsoilandresistivity measur
31、ementsfromthesurfaceduringthesitesurvey:EN125012:2003(E) 6 resistivityvaluesbelow30 W mand/orsoilconditionsasgiveninTable1indicatelocationsofhighcorrosion load; ifresistivityvaluesareabove30 W m,additionalinvestigationsuchassoilsamplingshallbedone.However,if thethreefollowingconditionsarefulfilledto
32、gether,theyindicatelocationsoflowcorrrosionloadandnoother investigationisnecessary: soilissandorgravel, resistivityvaluesareabove100 W m,forsitesurveyconditionsrepresentativeoftheaveragesoil moisturecontentandtemperaturevalues, soilconditionsasgiveninTable1areabsent. Inaddition,incaseofapossibleelec
33、tricalinfluence,whateveritsorigin,measurementsshouldbetakenonsitein ordertoassessmorepreciselyitseffectsontheestimationofthecorrosionload.Ifnomeasurementisperformed thecorrosionloadisacceptedhigh. 4.2.4 Soilsampling Soilsamplesaretakenatvariouslocationsonsitetakingintoaccountthenature,theheterogenei
34、tyandthe wetnessofthesoil;theresistivityandpHvaluesofthesoilsamplesarethenmeasuredinthelaboratory. AnnexBgivesadditionalinformationontheprocedureandmeasurementmethodsusedforsoilsampling. Theminimumresistivityvalue r *andthepHvaluemeasuredonasoilsampleafteradditionofdeionizedwater allowtoassessthecor
35、rosionloadusingTable2;theevaluationofsoilsontheborderbetweentwofieldsof corrosionloadrequiresexpertknowledge. Inaddition,amediumcorrosionloadshouldbechangedtohighwhenheterogeneoussoilconditionsoccuratthe levelofthestructure,suchas: presenceofawatertable(partlysubmergedstructure); widerangeof r *valu
36、esofsamples( r *max/ r *min3); widerangeofpHvaluesofsamples(pHmaxpHmin1,5). Table2Corrosionload(freecorrosionwithoutconcentrationcell) 9,5 69,5 HIGH MEDIUM LOW pH 4,56 4,5 10 30 50 100 r *=Minimumresistivityvalueafteraddingdeionizedwater( W m)EN125012:2003(E) 7 4.2.5Backfill materials Thecorrosionof
37、aburiedstructurewilldependuponthecorrosionloadofthenativesoil,butalsouponthe backfillingprocedure,thebackfillmaterials(especiallyiftheyaredifferentfromthenativesoil)andthepossible leachingconditions.Anassessmentofthecorrosionloadofimportedbackfillmaterialsshouldthereforebecarried outasitmayeitherinc
38、reaseorreducetheeffectivecorrosionloadonthestructure. Table3indicatescriteriatobemetbythebackfillmaterialsinordertoleadtoalowcorrosionload. Table3Criteriaforbackfillmaterials Parameters Lowcorrosionload Resistivity r *100 W m pH a 6pH9 Sulfide 10mg/kg Carbon Novisualdetectionofcoal,coke,graphite,car
39、boniferousresidues a MaterialsoutsidethispHrange,butwithlowacidityoralkalinityamount,couldbeconsideredas leadingtoalowcorrosionload. Whenindustrialbyproductsareconsideredasbackfillmaterials,thepresenceandamountofmetallicsaltsshould alsobeconsideredinordertoavoidpossiblegalvaniccorrosion. Theuseofsel
40、ectedbackfillmaterialsasshowninTable3canreducethecorrosionload(fromhightomediumor frommediumtolow),butonlywhenthefollowingconditionsarefulfilled: nowatertableorleachingconditionsthatcouldcausecontaminationfromthesurroundingnativesoil; nomixedsoils(nativeandimported)incontactwiththestructure. 5 Compl
41、ementaryinformationforanexistingstructure 5.1General Inthecaseofanexistingstructure,thecorrosionloadinsoilisassessedeithertoperformadiagnosisinorderto evaluatetheremaininglifetimeofthestructureortoestablishthereasonsofcorrosiondamagesand/orfailureson thestructure. Asthestructureactuallylaysinthesoil
42、moreinformationcanbecollectedthaninthecaseofanewstructure (seeEN125011:2003;annexB).Thiscovers: theinformationonthestructureitself(suchascorrosioneffects,operatingconditions); thecharacteristicsofthesoildirectlyincontactwiththewallsofthestructure; theeffectoftheenvironment(mainlyelectricalinfluence
43、s); thesystemofprotection(typeofcoating,cathodicprotection,.). Thethreestepsoftheprocedureforanewstructurecanbeusedfortheassessmentofthecorrosionload;butthe investigationconductedduringpreliminaryinquiry,sitesurveyandsoilsamplingwillbemorecompletethanforaEN125012:2003(E) 8 newstructure.Moreover,itisalsopossibletotakeintoaccountsamplescomingfromthestructureitselftoperform theassessment. Dependingontheeconomicalimpact,theassessmentofthecorrosi
