1、BRITISH STANDARD BS EN 12501-1:2003 Protection of metallic materials against corrosion Corrosion likelihood in soil Part 1: General The European Standard EN 12501-1:2003 has the status of a British Standard ICS 77.060 BS EN 12501-1:2003 This British Standard was published under the authority of the
2、Standards Policy and Strategy Committee on 6 May 2003 BSI 6 May 2003 ISBN 0 580 41802 2 National foreword This British Standard is the official English language version of EN 12501-1:2003. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and
3、 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 document may be found in the BSI Catalogue un
4、der 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. Users are responsible for its correct ap
5、plication. 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 change, and keep the UK interests informed;
6、 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 13 and a back cover. The BSI copyright date displayed in this document indicates when the document was
7、last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN125011 April2003 ICS77.060 Englishversion ProtectionofmetallicmaterialsagainstcorrosionCorrosion likelihoodinsoilPart1:General Protectiondesmatriauxmtalliquescontrelacorrosion Risq
8、uedecorrosiondanslessolsPartie1:Gnralits KorrosionsschutzmetallischerWerkstoffe KorrosionswahrscheinlichkeitinBdenTeil1: Allgemeines ThisEuropeanStandardwasapprovedbyCENon21February2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an
9、Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadeb
10、ytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Neth
11、erlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationa
12、lMembers. Ref.No.EN125011:2003EEN125011:2003(E) 2 Contents page Foreword3 Introduction .4 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Generalconcepts .5 4.1 Principles5 4.2 Assessmentofthecorrosionloadinsoil .5 4.3 Classificationofthecorrosionloadinsoil .5 4.4 Riskofappearanceofcor
13、rosiondamageinsoil 6 5 Factorsinfluencingthecorrosionofburiedstructures 6 5.1 General6 5.2 Soilsandbackfillmaterials .6 5.3 Structuresandmetals . 7 5.4 Environment .7 AnnexA (normative) Procedureforassessingthecorrosionloadinsoil8 A.1 Procedure .8 A.2 Preliminaryinquiry . .9 A.3 Sitesurvey. .9 A.4 S
14、oilsampling. .9 AnnexB (informative) Examplesoffactorsinfluencingthecorrosionofburiedstructures 10 B.1 Soilandbackfillmaterial .10 B.2 Structure .10 B.3 Environment .10 AnnexC (informative) Principalfunctionofaburiedstructureandmaintypeofcorrosiontobe considered12 Bibliography 13EN125011:2003(E) 3 F
15、oreword Thisdocument(EN125011:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC262“Metallicandother inorganiccoatings”,thesecretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyOctober2003,andconflict
16、ingnationalstandardsshallbewithdrawnatthelatest byOctober2003. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,It
17、aly,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN125011:2003(E) 4 Introduction Corrosionanalysisofaburiedstructureiscomplexduetotheinteractionsofvariousfactorsofthecorrosion system,suchassoil,typeofmetallicmaterial,characteristicsofthestructure
18、andenvironment. Consequently,identificationandassessmentofthefactorspertainingtoagivencorrosionlikelihoodasdefinedin thisEuropeanStandardaretoocomplexforpreciseresultstobeexpectedsolelyfromtheuseofthisEuropean Standard.ThereforethisEuropeanStandardhastobesupplementedbyexpertiseandscientifictraining.
19、 TheEuropeanStandardcomprisestwoparts: Part1:General Part2:Lowalloyedandnonalloyedferrousmaterials. 1Scope ThisEuropeanStandardprovidesabasisforassessingthecorrosionlikelihoodinsoilofburiedmetallicstructures suchaspipelines,sheathedmetalliccables,storagetanks,sheetpilings,supportanchors,culvertsande
20、arth reinforcement. ThispartofthisEuropeanStandarddefinesthegeneralconceptsfortheassessmentmethodandliststhemain factorsinfluencingthecorrosionofburiedstructures. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferences
21、arecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(i
22、ncludingamendments). EN125012 ProtectionofmetallicmaterialsagainstcorrosionCorrosionlikelihoodinsoilPart2:Low alloyedandnonalloyedferrousmaterials ENISO8044:1999,CorrosionofmetalsandalloysBasictermsanddefinitions(ISO8044:1999). 3 Termsanddefinitions ForthepurposeofthisEuropeanStandard,thetermsanddef
23、initionsgiveninENISO8044:1999andthefollowing apply. 3.1 corrosionload sumofalltheeffectsofacorrosiveenvironmentEN125011:2003(E) 5 3.2 foreigncathode elementoftheenvironmentincontactwiththestructure,withamorepositiveelectrochemicalpotentialthanthe structure,leadingtotheformationofagalvaniccell 4 Gene
24、ralconcepts 4.1Principles TheassessmentofthecorrosionlikelihoodofburiedmetallicstructuresdefinedinFigure1takesinto consideration: soil parameters; characteristicsofthestructureintheabsenceofprotection; environmental factors. Soilparameters Characteristicsofthestructure Environmentalfactors Assessmen
25、tofthecorrosionloadinsoil (Table1) Thisstandard Design Function Riskofappearanceofcorrosion damage (Table2) Serviceability Durability Incombinationwith productstandards Protection Figure1Diagramforassessingthecorrosionlikelihoodinsoil 4.2 Assessmentofthecorrosionloadinsoil Apracticalprocedureforthea
26、ssessmentofthecorrosionloadinsoilisgiveninannexA.Itisastepbystep methodcomprisingthreemainsteps:preliminaryenquiry,sitesurvey,soilsampling. 4.3 Classificationofthecorrosionloadinsoil Foragivenmetal,Table1definesthreeclassesofcorrosionloadinsoil.EN125011:2003(E) 6 Table1Classesofcorrosionloadinsoil C
27、lassesofcorrosion load Classificationintermsofprobability LOW Lowprobabilitythatthecorrosionratewillbeaboveathresholdvalue or thataspecific corrosioneffectwilloccur. MEDIUM Highprobabilitythatthecorrosionratewillbebetweentheupperandlowerthreshold values. HIGH Highprobabilitythatthecorrosionratewille
28、xceedathresholdvalue orthataspecific corrosioneffectwilloccur. NOTE Aspecificcorrosioneffectrelatestotypesofcorrosionsuchaspitting,crevicecorrosion,bimetalliccorrosion, hydrogenembrittlement,corrosionfatigueorstresscorrosioncracking.Ifsuchtypesareexpected,thecorrosionloadshould alwaysbeassumedasHIGH
29、becausequantitativeassessmentofsucheffectsisnotpossible. 4.4 Riskofappearanceofcorrosiondamageinsoil Theriskofappearanceofcorrosiondamagecanbeestimatedfromtheclassofcorrosionloadinsoilin combinationwiththerequirementsconcerningthefunctionofthestructure,itsdesign(material,thickness,.),its serviceabil
30、ityanditsdurability. Theassessmentoftheriskoftheappearanceofcorrosiondamageisnotdetailedinthisstandard.Standards dealingwithprotectivesystemsofspecificburiedmetallicstructuresaretobeusedincombinationwiththe corrosionloadinsoil.SomeguidanceisgiveninTable2. Table2Riskofappearanceofcorrosiondamageandse
31、rviceliferequirements Riskof appearanceof corrosiondamage Servicelife requirements Comments LOW Fulfilled Corrosionresistanceadequate. Noadditionalcorrosionprotectionmeasurerequired. MODERATE Notalwaysensured Corrosionresistancenotalwaysadequate. Monitoringisrecommendedtoassessrisksofcorrosiondamage
32、 andtodecidewhetheradditionalcorrosionprotectionmeasures arenecessary. HIGH Notfulfilled Corrosionresistanceinadequate. Additionalcorrosionprotectionmeasuresrequired. 5 Factorsinfluencingthecorrosionofburiedstructures 5.1General ExamplesoffactorstobeconsideredaregiveninannexB. 5.2 Soilsandbackfillma
33、terials Thisstandardonlyappliestosoilsandbackfillmaterialsindirectcontactwiththestructure.Thesematerialscanbe dividedintothefollowingcategoriesbasedontheirorigin: nativesoils,eitherdisturbedorundisturbed; importedsoils(backfillmaterials): naturalsoils(sand,gravel,crushedlimestone.);EN125011:2003(E)
34、7 artificialsoils:byproducts(granules,),industrialrefuse(ashes,cinders,.),etc. ThemainphysicalandchemicalparametersofsoilsandbackfillmaterialsareconsideredinEN125012. 5.3 Structuresandmetals Thecorrosionofastructureinagivensoildependsonnumerousparametersspecifictoeachstructure,for examplegeometry,co
35、mplexityandoperationalconditions.Moreover,forexistingstructures,corrosionproducts havetobeconsideredasapartofthecorrosionsystem. Whenconsideringthecorrosionofaburiedstructure,theimpairmentofitsfunctionsshouldbetakenintoaccount inrelationtotheexpectedtypeofcorrosion.Themaintypesofcorrosiontobeconside
36、redinrelationtothe principalfunctionaregiveninannexC. Metalsandtheiralloysconsideredinthisstandardcaneitherconstitutethematerialusedforthestructureorthe protectivesystemforthatstructure. 5.4Environment EnvironmentalfactorsarediscussedinEN125012andincludespecialfactorssuchaselectricalinterference wit
37、hinthesoilandforeigncathodes. Thisstandarddoesnotconsiderindetail: cathodicprotectionmeasures(seeEN12954andEN13509); corrosioninsoilduetostraycurrentsfromelectricaldirectcurrent(DC)systems(seeprEN50162); corrosioninsoilduetoinfluencesfromelectricalalternatingcurrent(AC)systems.EN125011:2003(E) 8 Ann
38、ex A (normative) Procedureforassessingthecorrosionloadinsoil A.1Procedure Action Assessment Soiland Backfillmaterials Environment Structure Yes Preliminary Inquiry Sufficient information (Criteria) No No Yes Site Survey Sufficient information (Criteria) No Criteria Soil Sampling Corrosionloadinsoil
39、Aftereachstep,thedecisionwhethertostoportocontinuecanbetaken.Thepossiblelackofinformationis counterbalancedbyacceptingahighercorrosionload. Thecriteriatobetakenintoaccountduringthisassessmentdependonthemetalandstructure.Theyare consideredindetailinEN125012.EN125011:2003(E) 9 A.2Preliminaryinquiry Th
40、einquiryismainlyperformedwithdatagatheredfromthedesigndocuments:profile,maps(geological, hydrological,etc.),structuredefinition,otherburiedstructuresinthevicinity,electricalenvironment,etc. A.3 Sitesurvey Thesitesurveyisperformedinordertogatherdataconcerningthephysicochemicalcharacteristicsofsoils,
41、pollutionindicatorsandthepresenceofvoltagegradientsintheground. A.4 Soilsampling Investigationsonsoilsampleswillgiveadditionalinformationfortheassessmentofthecorrosionloadinsoil.EN125011:2003(E) 10 Annex B (informative) Examplesoffactorsinfluencingthecorrosionofburiedstructures B.1 Soilandbackfillma
42、terial Typeofsoil,texture(permeabilitytooxygen,etc.) Typeofbackfillmaterial Resistivity pH,acidityalkalinity Watercontent,watertable Salts:sulfates,sulfides,chlorides,etc. Bacterialactivity(sulfatereducingbacteria) Soilhomogeneity(vertical,horizontal) B.2Structure Orientation(horizontalvertical) Ele
43、ctricalcontinuity Length,surfacearea Material Complexity(geometry,materials,etc.) Earthing Operatingconditions: temperatureandvariation pressureandvariation,etc. Coating(no,yes,type,etc.) B.3Environment Backfilling process Corrosioncellbydifferentialaeration DCinfluence,forexample:EN125011:2003(E) 11 Cathodicprotectionofotherstructures DC railways HighvoltageDCtransmission IndustryusingDCetc. ACinfluence,forexample: Highvoltagepowerlines AC railways etc. Influenceofforeigncathodes(e.g.steelpartlyinconcreteandpartlyinsoil,orcopperearthin
