1、ISOInternationalStandardISO24033Thirdedition2025-06Polyethyleneofraisedtemperatureresistance(PE-RT)pipesEffectoftimeandtemperatureontheexpectedstrengthTubesenpolyethylenedemeilleureresistanceaIatemperature(PE-RT)InfluencedutempsetdeIatemperaturesurlaresistanceespereeReferencenumberISO24033:2025(en)C
2、OPYRIGHTPROTECTEDDOCUMENTISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermi
3、ssion.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordivIntroductionv1 Scope12 Normativer
4、eferences13 Termsanddefinitions14 Basicformulae25 Expectedstrength35.1 Extrapolationlimits35.2 Graphicalrepresentation45.3 Tabulatedvalues76 DemonstratingConformanCe87 Derivationofwallthicknesses8Annex A (normative)Demonstratingconformancetothereferencelines9Annex B (informative)DerivationOfSCalGmaX
5、VallIeS10Bibliography14ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteeha
6、sbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.Theproceduresusedtodevelo
7、pthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.iso.org/directives).I
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11、htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC138,Plasticspipes,fittingsandvalvesforthetransportoffluids,SubcommitteeSC5,Generalpropertiesofpipes,fittingsandvalvesofplasticmaterialsandtheiraccessoriesTestmethodsandbasicspecifications.Thisthirdeditioncancelsandreplacesthesecondedition(ISO24033
12、2009),whichhasbeentechnicallyrevised.Themainchangesareasfollows: FoITnUla3ofthereferencelineforPE-RTType1forIlOwasadded. FortheproceduretodemonstrateconformancetothereferencelinesinAnneXA,themethoddescribedinISO9080wasadditionallyimplemented. AnneXB,whichgivesadviceforthedimensioningofpipingcompone
13、nts,wasadded.Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheusersnationalstandardsbody.AcompletelistingofthesebodiescanbefoundatWWW.iso.org/membnrs.htmLIntroductionAnincreasingnumberoftypesofpolyethylene(PE)polymers,madeinavarietyofprocesses,areavailableonthemarketfordifferentapplicationsi
14、nplasticpipingandductingsystems.Manyapplicationshavetheirownsystemstandardthatdefinesthepropertiesandrequirementsforthepipesandfittingsused.ThetypesofPEsuitableforuseinhotandcold-watersystemsarebasicallydifferentfromthoseforapplicationsatambienttemperatures,suchasinwatersupply,sewageanddrainage,andg
15、aseousfuels.Therefore,itmakessensetodifferentiatethosePEmaterialshavingraisedtemperature-resistancebytermingthemPE-RT”(forpolyethyleneofraisedtemperature).NOTEAbbreviatedtermbasedontheprovisionsof,andguidanceforpreparingnewabbreviatedtermsfor,basicpolymers,mixturesofpolymers,andrelatedtermsgiveninIS
16、O1043-1.Polyethyleneofraisedtemperatureresistance(PE-RT)pipesEffectoftimeandtemperatureontheexpectedstrength1 ScopeThisdocumentspecifiestheminimumvaluesforexpectedstrengthasafunctionoftimeandtemperatureintheformofreferencelines,foruseincalculationsonpipesmadeofa) polyethyleneofraisedtemperatureresis
17、tance(PE-RT)typeLandb) polyethyleneofraisedtemperatureresistance(PE-RT)typeH.2 NormativereferencesThefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditiono
18、fthereferenceddocument(includinganyamendments)applies.ISO1167-1,Thermoplasticspipes,fittingsandassembliesfortheconveyanceoffluidsDeterminationoftheresistancetointernalpressurePart1:GeneralmethodISO1167-2,Thermoplasticspipes,fittingsandassembliesfortheconveyanceoffluidsDeterminationoftheresistancetoi
19、nternalpressurePart2:PreparationofpipetestpiecesISO9080:2012,PlasticspipingandductingsystemsDeterminationofthelong-termhydrostaticstrengthofthermoplasticsmaterialsinpipeformbyextrapolation3 TermsanddefinitionsForthepurposesofthisdocument,thefollowingtermsanddefinitionsapply.ISOandIECmaintainterminol
20、ogydatabasesforuseinstandardizationatthefollowingaddresses: ISOOnlinebrowsingplatform:availableathttps:WWW.iso.org/obp IECElectropedia:availableathttps:WWWeIeCtroPedia.org3.1referencelinesgenericdescriptionoftheminimumlong-termhydrostaticstrengthtobeexpectedfromaparticularpolymer.Note1toentry:Refere
21、ncelinesarenottobeconsideredascharacteristicofaspecificgradeorofmaterialfromaspecificsupplier.Note2toentry:Thelinesaredescribedbyamathematicalequationwhichpermitsinterpolationandextrapolationinanunambiguouswaywithintheapplicabletemperatureandtimeranges.Note3toentry:ThereferencelinesforPE-RThavebeena
22、greeduponbyagroupofISO/TC138SC5expertsafterconsideringexperimentaldataandhavebeenacceptedbytherelevanttechnicalcommitteesinISO.4BasicformulaeThereferencelinesforPE-RTingeneralcanbeappliedtotemperaturesbetween20and110.ThereferencelinesforPE-RTTypeLdescribedbyFormUlee(1)and(2),areapplicablefortemperat
23、uresbetween20and95.Firstbranch:log10t=A1+B1T+C1log10+(D1Tlog10(1)Secondbranch:log10f=A2+B2T+C2log10+(D27)log10(2)wheretisthetime,inhours;Tisthetemperature,inKelvin;isthehoopstress,inMegapascaLThelowervalueobtainedfromFOrmUlaorFormula(2),respectively,representstheexpectedhoopstrength.Firstbranch:A1=-
24、190,481B1=78763,07C1=119,877D1=-58219,035Iog101=-190,481+78763,07/T+119,877Iog10-(58219,035/T)Iog10Secondbranch:A2=-23,7954B2=11150,56C?二D2=-I723,318Iog101=-23,7954+11150,56/T-(1723,318/T)Iog10The110valueshavebeendeterminedseparatelyusingwaterinsideandairoutsidethetestspecimenandhavenotbeenderivedfr
25、omFOrmUIae11)and2).ThereferencelineforPE-RTTypeLapplicablefor110isdescribedbyFormUla:lgof=A3+B3T+C3Iog10+(D3T)Iog10(3)A3=12,789B3=OC3=-33,829D3=0Iog101=12,789-33,829Iog10ThereferencelinesforPE-RTTypeILdescribedbyFormula(4),areapplicablefortemperaturesbetween20andIlO.Iogiot=A+BT+CIog10+(DT)Iog10A=-21
26、9B=90635,353C=I26,387D=-62600,752Iog101=-219+90635,353/T+126,3871OgIO-(62600,752/T)Iog105Expectedstrength5.1 ExtrapolationlimitsTheextrapolationlimits,i.e.,timelimitforwhichextrapolationisallowed,arebasedonanexperimentallydeterminedtimeat110andtheArrheniusequationforthetemperaturedependence,withanac
27、tivationenergyof110kj/mol(26kcal/mol).SeeISO9080:2012,5.2.ThevaluesgiveninTabIe1aretheminimumrequiredextrapolationtimelimitsforPE-RTmaterialsaccordingtothisdocument.Table1Minimumextrapolationtimelimits(basedon1yeartestingat110)TemperatureExtrapolationtimelimityears110a96to1002,591to95486to90681to851
28、276to801871to753061to705060100aExperimentallydetermined.ISO2025-AllrightsreservedWithtestingconditionsotherthan1yearat110C,theextrapolationlimitshallbecalculatedusingtheextrapolationfactorsgiveninISO9080:2012,5.25.2 GraphicalrepresentationFigUre1containsthereferencelinesforPE-RTTypeIcorrespondingtot
29、hevaluesoftheparametersgiveninCIaUSe4withextrapolationtimelimitsbasedontestingof1yearat110.FigUre2containsthereferencelinesforPE-RTTypeIIcorrespondingtothevaluesoftheparametersgiveninClaUSe4withextrapolationtimelimitsbasedontestingof1yearat110.XlKeyXlX2Ytime（三）timeyearsstress(MPa)Figure 1 Expectedst
30、rengthofPE-RTTypeIXlKeyXlX2Ytime（三）time(years)stress(MPa)Figure 2 ExpectedstrengthofPE-RTTypeII5.3TabulatedvaluesThecalculatedhoopstrengthvaluesforPE-RTTypeIandTypeIItobeusedforvarioustemperaturesandtimesaregiveninTable2.Thesevaluesincludenosafetyfactorsordesignfactors.Theyarebasedonextrapolatedtime
31、limitsasgiveninTabIeLTable2ExpectedhoopstrengthvaluesofPE-RTforvarioustimeandtemperaturevalueswithextrapolatedtimelimitsasgiveninTabIe1TemperatureTimeyearsExpectedstrengthofPE-RTTypeIMPaExpectedstrengthofPE-RTTypeIIMPa2018,89,858,69,6108,59,5258,49,4508,49,31008,39,33018,18,957,8,71098,6257,8,55088,
32、51007,8,44017,38,057,17,8107,17,8257,07,7506,97,61006,87,55016,67,256,47,0106,36,9256,26,8506,26,71006,16,76015,86,355,76,1105,66,1255,56,0505,45,91005,35,87015,15,454,95,3104,85,2254,75,1504,15,1Table2(continued)TemperatureTimeyearsExpectedstrengthofPE-RTTypeIMPaExpectedstrengthofPE-RTTypeIIMPa8014
33、34,654,24,5103,84,4183,44,39013,63,843,23,762,93,69513,23,442,63,36 DemonstratingconformanceTodemonstrateconformancetotherequirementsofthisdocument(referencelines),theproceduregiveninArmeXAshallapply.7 DerivationofwallthicknessesInAnnexB,theprinciplesregardingthederivationofminimumwallthicknessesof
34、pipingcomponentsrelativetotheapplicationclassesarespecified.AnnexA(normative)DemonstratingconformancetothereferencelinesThematerialinpipeformshallbeevaluatedinaccordancewithISO9080oranequivalentdocumentinwhichtheinternalpressuretestsaremadeinaccordancewithISO1167-1andISO1167-2尬findthelplvalues(asdef
35、inedinISO9080).Thevaluesthusdeterminedshallatleastbeashighasthecorrespondingvaluesofthereferencecurves.Testingshallbecarriedoutatthefollowingtemperatures: 20; 60to82; 95; 110.NOTE82isequivalentto180F,commonlyusedasatesttemperatureinASTMstandards.Alternatively,conformancewiththereferencelinesshallbed
36、emonstratedbyplottingtheindividualexperimentalresultsoftheinternalpressuretestsonthegraph.Atleast97,5%oftheseexperimentalresultsshalllieonorabovethereferencelines.ConformanceofthematerialtotheextrapolationtimelimitsasgiveninTabIe1shallbedemonstratedinaccordancewithISO9080:2012,5.1.5and5.2.Foralltemp
37、eratures,thetimelimitsofthematerialshallbeatleastashighasthevaluesgiveninTabIeLForPE-RTtypeIImaterials,theseexperimentalresultsshallnotgiveanybrittlefailuresindicatingthepresenceofakneeatanytemperatureupto110within8760h.AnnexB(informative)DerivationofScalcmaxvalues8.1 GeneralThisannexspecifiesthepri
38、nciplesregardingthederivationofthemaximumcalculatedpipevaluesS(Scalcmavalues)and,hence,ofminimumwallthicknesses,emin,ofpipingcomponentsrelativetotheclassesofserviceconditions(applicationclass)asgiveninISO10508,andtheapplicabledesignpressure,PDaStypicallyusedforhotandcoldindoorpipingsystems.NOTEClass
39、es1,2,4and5fromtheclassesofserviceconditionsinISO10508havebeenusedinthisannexforcalculations.8.2 Serviceconditionsandoverallservice(design)coefficientsThedesignstress,lforaparticularclassofserviceconditions(applicationclass)iscalculatedusingFonnUlae,f2),f3)andf4),usingMinersruleinaccordancewithISO13
40、7602,andtakingintoaccounttheapplicableclassrequirementsgiveninISO10508andTableB.I1andtheservicecoefficientsgiveninTabIe百2TableB.lClassificationofserviceconditionsApplicationclassesDesigntemperatureTdTimeaatTDyearsTmaXTimeatT1maxyearsT1malTimeatT1malhTypicalfieldofapplicationla604980195100Hotwatersup
41、ply(602a704980195100Hotwatersupply(70)4b2040602,52025702,5100100Underfloorheatingandlowtemperatureradiators5b206080142510901100100HightemperatureradiatorsISO10508isnotapplicabletovaluesofTd,TmaxandTmaIinexcessofthosegiveninthistable.aAcountrymayselecteitherClass1or2inordertoconformtoitsnationalguide
42、lines.bWheremorethanonedesigntemperatureappearsforanyclass,thetimesshouldbeaggregated.Forexample,thedesigntemperatureprofilefor50yearsforclass5is20oCfor14years,followedby60for25years,80for10years,90for1yearand100for100h.KeyTDdesigntemperature;TmaXmaximumdesigntemperature;Tmalmalfunctiontemperature.T
43、ableB.2Overallservice(design)coefficientsTemperatureOverallservicedesigncoefficientCTD1,5TmaX1,3T1mal1,07cold1,25KeyTDdesigntemperature;Tmaxmaximumdesigntemperature;Tmalmalfunctiontemperature;7oldcoldwatertemperature.NOTETheoverallservicecoefficientCforTcold(20)istakenfromISO12162.Theothervaluesaree
44、stimatesagreedbyexpertsofISO/TC138SC5WG5.8.3 DesignstressTheresultingdesignstressQDhasbeencalculatedrelativetoeachclassandisgivenintableB.3.TableB.3DesignstressApplicationclassesDesignStreSS,oDaMPaDesignstress,r,aMPaPE-RTTypeIPE-RTTypeII13,293,5322,683,3743,253,3852,382,8820for50years6,687,46aValues
45、areroundedtotheseconddecimalplace(i.e.thenearest0,01MPa).8.4 DerivationofmaximumvalueofScalc(SCalGmax)SCaIC,maxisesmallervalueofeitherFormUIa(B.l)orFormula(B.2):DpPD(B.I)where:ODPisthedesignstressinthematerialtakenfromTableB.3inmegapascals(MPa);PDisthedesignpressureof4baror6baror8baror10bar,asapplicable,expressedinmegapascals(MPa)orcoldPD(B.2)where:coldisthedesignstressat20relativetoadesignservicelifeof50yearsinmegapascals(MPa);PDisthedesignpressureo
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