EN 17415-1-2020 区域冷却管 直埋冷水管网用粘结单管系统 第1部分：工厂制造的钢或塑料服务管 聚氨酯隔热和聚乙烯套管的管道组件

EUROPEANSTANDARDNORMEEUROPÉENNEEUROPÄISCHENORM

EN17415-1

July2020

ICS23.040.99

EnglishVersion

Districtcoolingpipes-Bondedsinglepipesystemsfor

directlyburiedcoldwaternetworks-Part1:Factorymadepipeassemblyofsteelorplasticservicepipe,polyurethane

thermalinsulationandacasingofpolyethylene

Réseauxd'eauglacée-Systèmesbloquésdetuyaux

pourlesréseauxd'eauglaceeenterrésdirectement-

Partie1:Assemblagedetubedeserviceenacierouen

matiereplastique,isolationthermiqueenpolyuréthane

etprotectionenpolyéthylène

Fernkältesysteme-Verbundmantelrohrsystemefür

direkterdverlegteFernkältenetze-Teil1:Werkmäßig

gedämmtesVerbund-Rohrsystem,bestehendausStahl

oderPlastikMediumrohr,Polyurethan-

WärmedämmungundeinemAußenmantelaus

Polyethylen

ThisEuropeanStandardwasapprovedbyCENon22June2020.

CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferences

concerningsuchnationalstandardsmaybeobtainedonapplicationtotheCEN-CENELECManagementCentreortoanyCENmember.

ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCEN-CENELECManagementCentrehasthesamestatusastheofficialversions.

CENmembersarethenationalstandardsbodiesofAustria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,

Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandUnitedKingdom.

EUROPEANCOMMITTEEFORSTANDARDIZATION

COMITÉEUROPÉENDENORMALISATION

EUROPÄISCHESKOMITEEFURNORMUNG

CEN-CENELECManagementCentre:RuedelaScience23,B-1040Brussels

⑥2020CENAllrightsofexploitationinanyformandbyanymeansreservedRef.No.EN17415-1:2020EworldwideforCENnationalMembers.

2

EN17415-1:2020(E)

ContentsPage

Europeanforeword 3

Introduction 4

1Scope 5

2Normativereferences 5

3Termsanddefinitions 7

4Requirements 7

4.1General 7

4.2Servicepipes 7

4.3Casing 1

4.4Polyurethane(PUR)foamthermalinsulation 13

4.5Pipeassembly 14

5Testmethods 19

5.1Generalconditionsandtestspecimen 19

5.2Casing 20

5.3Polyurethane(PUR)foamthermalinsulation 2

5.4Pipeassembly 24

6Marking 27

6.1General 27

6.2Servicepipe 28

6.3Casing 28

6.4Pipeassembly 28

AnnexA(informative)Guidelinesforinspectionandtestin 29

AnnexB〔normative〕Thermalconductivityoffactorymadepipeassemblies-Test

procedure 3

AnnexC(informative)Wastetreatmentandrecycling 38

AnnexD(informative)ApplicationofMiner'sRule 39

Bibliograph 42

3

EN17415-1:2020(E)

Europeanforeword

Thisdocument(EN17415-1:2020)hasbeenpreparedbyTechnicalCommitteeCEN/TC107"Prefabricateddistrictheatinganddistrictcoolingpipesystems",thesecretariatofwhichisheldbyDS.

ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextorbyendorsement,atthelatestbyJanuary2021,andconflictingnationalstandardsshallbewithdrawnatthelatestbyJanuary2021.

Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.CENshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.

AccordingtotheCEN-CENELECInternalRegulations,thenationalstandardsorganisationsofthefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandtheUnitedKingdom.

EN17415-1:2020(E)

4

Introduction

Factorymadebondedsinglepipesystemsfordirectlyburieddistrictcoolingnetworksareofcommontechnicalusage.Inordertoensurequalityincludingproduct-relatedservicelife,toensuresafetyinuse,economicalenergyusageandtofacilitatecomparabilityinthemarket,CEN/TC107decidedtosetupstandardsfortheseproducts.

ThisdocumentisoneofaseriesofstandardswhichformseveralpartsofEN17415,Districtcoolingpipes-Bondedsinglepipesystemsfordirectlyburiedcoldwaternetworks:

—Part1:Factorymadepipeassemblyofsteelorplasticservicepipe,polyurethanethermalinsulationandacasingofpolyethylene(thisdocument);

—Part2:Factorymadefittingassembliesofsteelorplasticservicepipe,polyurethanethermalinsulationandacasingofpolyethylene1;

—Part3:Factorymadesteelvalveassemblyforsteelorplasticservicepipe,polyurethanethermalinsulationandacasingofpolyethylene1;

TheotherstandardsfromCEN/TC107coveringthissubjectare:

—EN17414-1,Districtcoolingpipes-Factorymadeflexiblepipesystems-Part1:Classification,generalrequirementsandtestmethods;

—EN17414-2,Districtcoolingpipes-Factorymadeflexiblepipesystems-Part2:Bondedsystemwithplasticservicepipes-Requirementsandtestmethods;

—EN17414-3,Districtcoolingpipes-Factorymadeflexiblepipesystems-Part3:Nonbondedsystemwithplasticservicepipes-Requirementsandtestmethods;

—ENZZZZZ-1,Districtcoolingpipes-Designandinstallationofthermalinsulatedbondedsingleandtwinpipesystemsfordirectlyburiedcoldwaternetworks-Part1:Design1;

—ENZZZZZ-2,Districtcoolingpipes-Designandinstallationofthermalinsulatedbondedsingleandtwinpipesystemsfordirectlyburiedcoldwaternetworks-Part2:Installation1;

—EN489-1,Districtheatingpipes-Bondedsingleandtwinpipesystemsforburiedhotwaternetworks-Part1:JointcasingassembliesandthermalinsulationforhotwaternetworksinaccordancewithEN13941-1;

—EN14419,Districtheatingpipes-Bondedsingleandtwinpipesystemsforburiedhotwaternetworks

-Surveillancesystems.

WastemanagementandrecyclingofmaterialsisdealtwithinAnnexC.

1Underdevelopment.

EN17415-1:2020(E)

5

1Scope

Thisdocumentspecifiesrequirements,designandtestmethodsforstraightlengthsoffactorymadethermallyinsulatedpipe-in-pipeassembliesfordirectlyburieddistrictcoolingdistributionsystems,comprisingaservicepipefromDN15toDN1200,rigidpolyurethanefoaminsulationandacasingofpolyethylene.Thepipeassemblycanalsoincludethefollowingadditionalelements:measuringwires,spacersanddiffusionbarriers.

Thisdocumentappliesonlytoinsulatedpipeassemblies,forcontinuousoperationwithwateratvarioustemperatures(1to30)℃andamaximumoperationpressureof25bar.

Thedesignisbasedonanexpectedservicelifewithcontinuousoperationofaminimum50years.

2Normativereferences

Thefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forrundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.EN10204,Metallicproducts—Typesofinspectiondocuments

EN10216-1:2013,Seamlesssteeltubesforpressurepurposes—Technicaldeliveryconditions—Part1:Non-alloysteeltubeswithspecifiedroomtemperatureproperties

EN10216-2,Seamlesssteeltubesforpressurepurposes—Technicaldeliveryconditions—Part2:Non-alloyandalloysteeltubeswithspecifiedelevatedtemperatureproperties

EN10217-1:2019,Weldedsteeltubesforpressurepurposes—Technicaldeliveryconditions—Part1:Electricweldedandsubmergedarcweldednon-alloysteeltubeswithspecifiedroomtemperatureproperties

EN10217-2,Weldedsteeltubesforpressurepurposes—Technicaldeliveryconditions—Part2:Electricweldednon-alloyandalloysteeltubeswithspecifiedelevatedtemperatureproperties

EN10217-5,Weldedsteeltubesforpressurepurposes—Technicaldeliveryconditions—Part5:Submergedarcweldednon-alloyandalloysteeltubeswithspecifiedelevatedtemperatureproperties

EN10220,Seamlessandweldedsteeltubes—Dimensionsandmassesperunitlength

EN12201-2,Plasticspipingsystemsforwatersupply,andfordrainageandsewerageunderpressure一Polyethylene(PE)—Part2:Pipes

EN12201-5,Plasticspipingsystemsforwatersupply,andfordrainageandsewerageunderpressure一Polyethylene(PE)—Part5:Fitnessforpurposeofthesystem

EN14419,Districtheatingpipes—Bondedsingleandtwinpipesystemsforburiedhotwaternetworks一Surveillancesystems

EN17248,Districtheatinganddistrictcoolingpipesystems—Termsanddefinitions

EN17414-2,Districtcoolingpipes—Factorymadeflexiblepipesystems—Part2:Bondedsystemwithplasticservicepipes-Requirementsandtestmethods

ENISO844,Rigidcellularplastics—Determinationofcompressionproperties(ISO844)

EN17415-1:2020(E)

6

ENISO845,Cellularplasticsandrubbers—Determinationofapparentdensity(ISO845)

ENISO1133(allparts),Plastics—Determinationofthemeltmass-flowrate(MFR)andmeltvolume-flowrate(MVR)ofthermoplastics(ISO1133series)

ENISO2505,Thermoplasticspipes—Longitudinalreversion—Testmethodandparameters(ISO2505)ENISO3126,Plasticspipingsystems—Plasticscomponents—Determinationofdimensions(ISO3126)ENISO3127:2017,Thermoplasticspipes—Determinationofresistancetoexternalblows—Round-the-

clockmethod(ISO3127:1994)

ENISO4590,Rigidcellularplastics—Determinationofthevolumepercentageofopencellsandofclosedcells(ISO4590)

ENISO6259-1,Thermoplasticspipes—Determinationoftensileproperties—Part1:Generaltestmethod(ISO6259-1)

ENISO8501-1,Preparationofsteelsubstratesbeforeapplicationofpaintsandrelatedproducts—Visualassessmentofsurfacecleanliness—Part1:Rustgradesandpreparationgradesofuncoatedsteelsubstratesandofsteelsubstratesafteroverallremovalofpreviouscoatings(ISO8501-1)

ENISO9080,Plasticspipingandductingsystems—Determinationofthelong-termhydrostaticstrengthofthermoplasticsmaterialsinpipeformbyextrapolation(ISO9080)

ENISO11357-6,Plastics—Differentialscanningcalorimetry(DSC)—Part6:Determinationofoxidationinductiontime(isothermalOIT)andoxidationinductiontemperature(dynamicOIT)(ISO11357-6)

ENISO12162,Thermoplasticsmaterialsforpipesandfittingsforpressureapplications—Classification,designationanddesigncoeficient(ISO12162)

ISO6964,Polyolefinpipesandfittings—Determinationofcarbonblackcontentbycalcinationandpyrolysis—Testmethod

ISO11414:2009,Plasticspipesandfittings—Preparationofpolyethylene(PE)pipe/pipeorpipe/fittingtestpieceassembliesbybuttfusion

ISO13953,Polyethylene(PE)pipesandfittings—Determinationofthetensilestrengthandfailuremodeoftestpiecesfromabutt-fusedjoint

ISO16770,Plastics—Determinationofenvironmentalstresscracking(ESC)ofpolyethylene—Full-notchcreeptest(FNCT)

ISO18553,Methodfortheassessmentofthedegreeofpigmentorcarbonblackdispersioninpolyolefinpipes,fittingsandcompounds

EN17415-1:2020(E)

7

3Termsanddefinitions

Forthepurposesofthisdocument,thetermsanddefinitionsgiveninEN17248andthefollowingapply.ISOandIECmaintainterminologicaldatabasesforuseinstandardizationatthefollowingaddresses:

—IECElectropedia:availableat

/

—ISOOnlinebrowsingplatform:availableat

/obp

3.1

foamdensity

apparentdensityofthefoamoftheinsulatinglayeratanyposition

3.2

insulationmaterial

materialwhichreducestheheatloss

3.3

meltmass-flowrate

MFR

rateofextrusionofmoltenresinthroughadieofspecifiedlengthanddiameterunderprescribedconditionsoftemperature,loadandpistonpositioninthebarrelofanextrusionplastometer,theratebeingdeterminedasthemassextrudedoveraspecifiedtime

3.4

pipeassembly

assembledproduct,consistingofatleastoneservicepipe,insulatingmaterialandcasing

3.5

standarddimensionratio

SDR

numericaldesignationofapipeseries,whichisaconvenientroundnumber,approximatelyequaltothedimensionratioofthenominaloutsidediameterandtheminimumwallthickness

4Requirements

4.1General

Unlessotherwisespecified,therequirementsshallbevalidforeachsinglemeasurement.

Forinformationonsuitableguidelinesforinspection,seeAnnexA.

4.2Servicepipes

4.2.1Steelservicepipes

Specification

ThetechnicaldeliveryconditionsofthesteelservicepipeshallbeinaccordancewithTable1.

EN17415-1:2020(E)

8

Table1—Steelservicepipespecification

Typeofpipe

Diameter

ENstandard

Materiala

Seamless

≤DN300

EN10216-1

P235TR1b

Seamless

All

EN10216-1

P235TR2

Seamless

All

EN10216-2

P235GH

ERW

≤DN300

EN10217-1

P235TR1b

ERW

All

EN10217-1

P235TR2

ERW

All

EN10217-2

P235GH

SAW

All

EN10217-5

P235GH

aEquivalentorhighersteelgradesaccordingtoapprovedEuropeanstandardsmaybeusedbyagreement.

bIfP235TR1materialisused,animpacttestat0℃,accordingtoEN10216-1:2013,Table5,orEN10217-1:2019,Table4,asspecifiedforP235TR2shallbeperformedandspecificinspectioninaccordancewithEN10216-1orEN10217-1,Option9shallbecarriedout.

ForthecalculationoftheyieldstrengthRp0,2,atthedesigntemperatureinthetemperaturerangeupto30°℃,thevalueofRpo,2forroomtemperatureshallbeusedforP235TR1,P235TR2andP235GH.

ForhighersteelgradesthanthosegiveninTable1theyieldstrengthisdefinedintheirrelatedstandards.Ifsuchhighersteelgradesareusedformediumpipes,itshallbeverifiedthatallcomponentsusedintheinvolvedpartofthesystemarecompatibletothehigheryieldstrengthofthepipes.

Allsteelpipesandcomponentsusedformanufacturingofpipeassembliesunderthescopeofthisdocumentshallasaminimumbedeliveredtothemanufacturerwithaninspectioncertificate3.1accordingtoEN10204.Theinspectioncertificateshallonrequestbepassedontotheclientwhoordersthepipeassemblies.

Incaseamaterialrelatedinspectioncertificate3.1accordingtoEN10204isrequiredbytheclientwhoordersthepipeassemblies,thisrequestshallbegivenwhilstplacingtheorderwiththemanufacturerofthepipeassemblies.

NOTEAnylaterrequestforprovisionofsuchdocumentationcouldbetoolateandpossiblycan'tbemetbythemanufacturer,sincethemanufacturerhastoorganizetheassignmentof3.1certificatestopipesandpartofpipesbeforestartingtheproduction.

Alengthofpipeshallnotincludeacircularweld.

ERWpipessuppliedshallnotincludetheweldsusedtojointogetherthestrippriortoforming.

Diameter

ThediametershallbeinaccordancewithTable2whichisderivedfromEN10220.

Thetolerancesontheoutsidediameter,do,ofthesteelservicepipeatthepipeends,shallbeinaccordancewiththerespectivepipestandardasgiveninTable1.Diametermeasurementsshallbemadeusingacircumferentialtape.Thediametershallbecalculatedastheactualcircumferencedividedbyπ.Outsidediameter,do,168,3mmandsmallermaybemeasuredusingaslidecalliper.

Theout-of-roundnessshallbedeterminedinaccordancewiththerespectivepipestandardasgiveninTable1.

EN17415-1:2020(E)

9

Wallthickness

Thewallthicknesses,t,andmassesshallbeinaccordancewithEN10220withaminimumasindicatedinTable2.

Subjecttodesignconsiderations,otherwallthicknessesmaybeused,butinnocasetheyshallbelessthantheminimaindicatedinTable2.

ThetolerancesonthewallthicknessofthesteelservicepipeshallbeinaccordancewiththerespectivepipestandardasgiveninTable1.

Table2—Steelservicepipedimensions

Nominaldiameter

DN

Outsidediameter

do

mm

Minimumnominalwallthickness

t

mm

15

20

25

21,3

26,9

33,7

2,0

2,0

2,3

32

40

50

42,4

48,3

60,3

2,6

2,6

2,9

65

80

100

76,1

88,9

114,3

2,9

3,2

3,6

125

150

200

139,7

168,3

219,1

3,6

4,0

4,5

250

300

350

273,0

323,9

355,6

5,0

5,6

5,6

400

450

500

406,4

457,0

508,0

6,3

6,3

6,3

600

700

800

610,0

711,0

813,0

7,1

8,0

8,8

900

1000

1200

914,0

1016,0

1219,0

10,0

11,0

12,5

Surfacecondition

Inordertoensureproperbondingbetweenthesteelservicepipeandthethermalinsulation,thefollowingprocedureshallbefollowed:

EN17415-1:2020(E)

10

a)Priortothermalinsulation,theoutersurfaceofthepipeshallbecleanedsothatitisfreefromrust,millscale,oil,grease,dust,paint,moistureandothercontaminants.

b)Beforecleaningthesteelservicepipe,theoutersurfaceshallcomplywithrustgradeA,BorCaccordingtoENISO8501-1,withoutpitting.

ItisrecommendedtocleanthesurfacetoSa2accordingtoENISO8501-1.

Pipeends

Allsteelservicepipesusedformanufacturingofpipeassembliesshallbedeliveredwithpipeendspreparedforwelding.Forthis,therelevantorderoptioninaccordancewiththerespectivepipestandardasgiveninTable1shallbeagreed.

4.2.2Plasticservicepipes

Specification

Plasticsservicepipesshallbe

—polyethylenepipesPE80orPE100inaccordancewithEN12201-2,oralternatively,

—PP,PB,PE-X,PE-RTormultilayerplasticsservicepipesinaccordancewiththerespectivepipestandardasgiveninEN17414-2.

Alengthofpipeshallnotincludeacircularjoint.

Diameter

ThenominaloutsidediameteranddiametertolerancesofthePEplasticservicepipeshallbeinaccordancewithEN12201-2.

ThenominaloutsidediameteranddiametertolerancesofthePP,PB,PE-X,PE-RTandmultilayerplasticsservicepipeshallbeinaccordancewiththerespectivepipestandardasgiveninEN17414-2.

Wallthickness

ThewallthicknessofthePEplasticservicepipeshallbeinaccordancewithEN12201-2.

Table3definesthemaximumSDRratiosoftheservicepiperequiredtowithstanddifferentoperatingpressures.

Table3—MaximumSDRratiosfordifferentoperatingpressures

Servicepipe

6

Ope

10

ratingpres

bar

16

sure

20

25

PE100

21

13,6

9

7,4

6

PE80

17

11

7,4

6

一

NOTEThemaximumSDRnumbersgiveninTable3havebeencalculatedbasedonENISO15494withthesafetyfactor1,25foracontinuousoperatingtemperatureof30℃andaservicelifeof50years.Othertemperature/timeprofilescanbeappliedinaccordancewithENISO13760(Miner'sRule).FurtherinformationisgiveninAnnexD.

Duetoweldingrequirements,PE100andPE80shallnotbecombinedinthesamesystem.

EN17415-1:2020(E)

11

ThetoleranceontheactualwallthicknessofthePEplasticservicepipeshallbeinaccordancewithEN12201-2.

ThewallthicknessandthetoleranceontheactualwallthicknessofthePP,PB,PE-X,PE-RTandmultilayerplasticsservicepipeshallbeinaccordancewiththerespectivepipestandardasgiveninEN17414-2.TheSDRnumbersforthePP,PB,PE-X,PE-RTandmultilayerplasticsservicepipesshallbeinaccordancewithEN17414-2.

Surfacecondition

Inordertoensureproperbondingbetweentheplasticservicepipeandthethermalinsulation,thefollowingprocedureshallbefollowed:

Priortoinsulation,theoutersurfaceofthepipeshallbecleanedsothatitisfreefrom,oil,grease,dust,paint,moistureandothercontaminants

Surfacetreatmenttoimprovetheshearstrengthbetweenthethermalinsulationandplasticservicepipeispermissibleprovidedthatthetreatedpipeassemblystillcomplieswiththespecification.

4.3Casing

4.3.1Materialproperties

Materialcomposition

ThecasingmaterialshallbeblackcolouredPEvirginorreworkmaterialcontainingonlythoseanti-oxidants,UV-stabilizersandcarbonblacknecessaryforthemanufactureanduseofpipeassembliestothisspecification.TheblackcolouredPEmaterialtobeextrudedshallbetestedinaccordancewithENISO9080andclassifiedatleastaPE80materialinaccordancewithENISO12162.

ThecasingmaybeaseparatelymanufacturedpipeorbeapplieddirectlyontothePURthermalinsulationbyextrusion.

Thecarbonblackcontentshall,whentestedinaccordancewithISO6964,be(2,0to2,5)%bymass.

NOTETherequiredcarbonblackcontentensuresUVstabilityfortheservicelife.

Thecarbonblackshallbefinelydispersedinthematerial.Whentestedinaccordancewith5.2.3,thefollowingrequirementsshallbemet:

—Carbonblackagglomeratesandparticlesshallbegrade≤3.

—DispersionappearanceratingnotworsethanA1,A2orA3inISO18553.

Meltmass-flowrate

Themeltmass-flowrate(MFR),ing/10min,ofblackPEmaterialsusedforthemanufacturingofcasingsshallliewithin0,2≤MFR≤1,0g/10mindeterminedinaccordancewithENISO1133(allparts),condition5kg,190℃.

BlackcolouredPEmaterialsconformingto

,whichdonotdiffermorethan0,5g/10mininMFR

shallbeconsideredfusibletoeachother.

CasingsmadeofPEmaterialsoutsidethisMFRrangeof0,5g/10minmaybefusionweldediffusioncompatibilityhasbeendemonstratedbythemanufacturerofthepipeassembly.ThisshallbedonebypreparingabuttfusionjointusingtheparametersasspecifiedinISO11414:2009,AnnexA.Therequirementoffusioncompatibilityisaductilefailuremodeofthejointwhentestedat23℃inaccordancewithISO13953.

EN17415-1:2020(E)

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Thermalstability

Thethermalstabilityisdeterminedbyoxygeninductiontime(OIT)oftheblackcolouredPEmaterialandshallbeatleast20minwhentestedat210℃accordingtoENISO11357-6.

Useofreworkmaterial

Onlyclean,notdegraded,reworkmaterial,generatedfromthemanufacturer'sownproductionofpipesthatdoesnotincludeanyPUinsulationmaterialshallbeused.

4.3.2Casingproperties

Nominaloutsidediameter

ThenominaloutsidediameterofthecasingshouldbeselectedfromTable4.

TheactualoutsidediametershallbemeasuredinaccordancewithENISO3126.

Wallthickness

ThewallthicknessofthecasingshallbeinaccordancewithTable4.Whenthecasingincludesadiffusionbarrier,thewallthicknessofonesinglePElayerofthecasingshallbeinaccordancewithTable4.

TheactualwallthicknessshallbemeasuredinaccordancewithENISO3126.

Table4—Casingdimensions

Nominaloutsidediameter

Dcmm

Minimumwallthickness

eminmm

75

90

110

3,0

3,0

3,0

125

140

160

3,0

3,0

3,0

180

200

225

3,0

3,2

3,4

250

280

315

3,6

3,9

4,1

355

400

450

4,5

4,8

5,2

500

560

630

5,6

6,0

6,6

EN17415-1:2020(E)

13

Nominaloutsidediameter

Dcmm

Minimumwallthickness

eminmm

710

800

900

7,2

7,9

8,7

1000

1100

1200

1400

9,4

10,2

11,0

12,5

Appearance,surfacefinish,casingends

Theinternalandexternalsurfacesofthecasingshallbecleanandfreefromsuchgroovingorotherrdefectsthatmightimpairitsfunctionalproperties(see5.2.1).

Thecasingendsshallbecleanlycutandshallbesquarewithin2,5°withtheaxisofthepipe.

SurfacetreatmenttoimprovetheshearstrengthbetweenthePURfoamandcasingispermissibleprovidedthatthetreatedpipeassemblystillcomplieswiththespecification.

Elongationatbreak

Theelongationatbreakdeterminedinaccordancewith5.2.2shallnotbelessthan350%.

Heatreversion

WhentestedinaccordancewithENISO2505,thelongitudinallengthatanypositiononthecasingshallnotchangebymorethan3%.Oninspectionaftertesting,thecasingshallnotshowanyfaults,cracks,cavitiesorblisters.

Stresscrackresistance

Whentestedinaccordancewith5.2.4,thetimetofailureshallnotbelessthan300h.

4.4Polyurethane(PUR)foamthermalinsulation

4.4.1Composition

Themanufacturerofthepipeassemblyshallberesponsibleforthechoiceofrawmaterials,compositionandmanufacturingconditions.

Themanufacturershallkeeprecords,documentingtherawmaterialsused,theprescribedmixingratioandthetestsperformed.

TherecordsshalldemonstratethatthePURfoamfromtheproductionofpipeassembliesisofthesamecompositionasthefoamsampleusedforthethermalconductivitytestin5.4.2andmeetstherequirementsof4.4.

4.4.2Cellstructure

Generalappearance

ThePURfoamshallhaveauniformcellstructurefreefromsmears.

EN17415-1:2020(E)

14

Cellsize

Theaveragesizeofthecellsinaradialdirectionshallbelessthan0,5mm,determinedinaccordancewith

.

Closedcellcontent

Theclosedcellcontentdeterminedinaccordancewith

shallbenotlessthan88%.

Voidsandbubbles

Theaverageareaofvoidsandbubblesdeterminedonthefivecrosssectionsinaccordancewith

shallnotconstitutemorethan5%ofthecrosssectionalareaofthePURfoam.Nosinglevoidshallbelargerthan2/3oftheinsulationthicknessbetweentheservicepipeandthecasingatthepositionofthevoid.However,forseriesOaccordingtoTables6and7thelocalinsulationthicknessshallbeminimum15mm.

4.4.3Compressivestrength

Thecompressivestrengthorthecompressivestressat10%relativedeformationasdefinedinENISO844shallbenotlessthan0,3MPainaradialdirectionwhentestedinaccordancewith5.3.3.

4.4.4Foamdensity

Thedensityofth