YD-T 841.4-2016地下通信用塑料管 第4部分：硅芯管

ICS33.040.50

M42

YD

CommunicationsIndustryStandardof

thePeople'sRepublicofChina

YD/T841.4—2016

Replace

Plasticductfortelecommunication

undergroundconduit——

Part4:

Silicoreplasticduct

地下通信用塑料管第4部分：硅芯管

（EnglishTranslation）

IssueDate:2016-04–05Implementationdate:2016-07–

IssuedbyMinistryofIndustryandInformationTechnology

ofthePeople'sRepublicofChina

YD/T841.4—2016

Foreword

ChinaCommunicationsStandardsAssociation(CCSA)isinchargeofthisEnglishtranslation.

IncaseofanydoubtaboutthecontentsofEnglishtranslation,theChineseoriginalshall

beconsideredauthoritative.

YD/T841Plasticductfortelecommunicationundergroundconduitconsistsofthefollowing

parts:

——Part1:General;

——Part2:Solid-wallduct;

——Part3:Double-wallcorrugatedduct;

——Part4:Silicoreplasticduct;

——Part5:Plumblossomduct;

——Part6:Gridduct;

——Part7:Honeycombduct;

——Part8:Plastic-alloycompositeduct;

……

ThispartisthePart4ofYD/T841.

ThispartisdraftedinaccordancewiththerulesgivenintheGB/T1.1-2009Directivesfor

standardization–Part1:Structureanddraftingofstandards.

Attentionisdrawntothepossibilitythatsomeoftheelementsofthispartmaybethesubject

ofpatentrights.Theissuingbodyofthisdocumentshallnotbeheldresponsiblefor

identifyinganyorallsuchpatentrights.

ThispartwasproposedandpreparedbyCCSA.

II

YD/T841.4—2016

Plasticductfortelecommunicationundergroundconduit

Part4:Silicoreplasticduct

1Scope

Thispartspecifiestheproductstructure,classifications,models,requirements,testmethods,

inspectionrules,marking,packaging,transportationandstorageofHigh-densitypolyethylene

Silicoreplasticduct(hereinafterreferredtoasSilicoreplasticduct)fortelecommunication

undergroundconduits.

ThispartisapplicabletotheSilicoreplasticductsandfittingswhichusedinunderground

telecommunicationconduitsystems.

2Normativereferences

Thefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.

Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatest

editionofthereferenceddocument(includinganyamendments)applies.

GB/T2411-2008Plasticsandebonite-Determinationofindentationhardnessbymeansofa

durometer(shorehardness)

GB/T2828.1-2012Samplingproceduresforinspectionbyattributes-Part1:Samplingschemes

indexedbyacceptancequalitylimit(AQL)forlot-by-lotinspection

GB/T6111Thermoplasticspipingsystemsfortheconveyanceoffluids-Determinationofthe

resistancetointernalpressure.(ISO1167：1996,IDT)

GB/T6995.2Markingsforelectricwireandcable—Part2：Standardcolours

GB/T7424.2-2008Opticalfibrecablegenericspecification—Part2：Basicopticalcabletest

procedures(IEC60794-1-2：2003,MOD)

GB/T11116Highdensitypolyethyleneresin

GB/T26572-2011Requirementsofconcentrationlimitsforcertainrestrictedsubstancesin

electricalandelectronicproducts

GB/T841.1-2016PlasticductfortelecommunicationundergroundconduitPart1:General

3Productstructure,classificationandmodel

3.1Productstructure

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YD/T841.4—2016

TheSilicoreplasticductiscomposedofhighdensitypolyethylene（HDPE）outerlayer,which

mayalsoincludeoutercolorstripeandpermanentsolidsiliconinnerringlayerwiththickness

notlessthan0.1mm(siliconcorelayerforshort),ThecrosssectionisshowninFigure1.

Figure1:StructureofSilicoreplasticduct

3.2Classification

3.2.1Classifiedbystructure

Theinnerandouterwallsaresmoothsolid-walledsilicoreplasticducts,denotedbyG;

Ribbedsilicoreplasticductswithsmoothouterwallandlongitudinalribbedinnerwall,

denotedbyG1;

Ribbedsilicoreplasticductswithribsontheouterwallandsmoothinnerwall,denotedby

G2;

Ribbedsilicoreplasticductswithribsontheinnerandouterwalls,denotedbyG3;

3.2.2Classifiedbyproductcolor

Theoutersheathisasinglecolorsilicoreplasticductwithoutcolorstripe;

Silicoreplasticductinlaidwithothercolors.

3.3Productmodel

ProdcutmodelshallconformtoYD/T841.1-2016,4.2.Theproductstructureisclassified

accordingto3.2.1ofthispart,andthespecificationisaccordingtotable2ofthispart.

Example1:Thespecificationis32/26,andtheinnerandouterwallsarebothsolid-walled

flexiblesilicoreplasticductmarkedasSYGN32/26.

Example2:Aflexiblesilicoreplasticductswithaspecificationof40/33andribsontheinner

andouterwallsismarkedasSYG3N44/33.

4Requirements

4.1Material

Thehigh-densitypolyethylenematerialforsilicoreplasticductshouldmeettherequirements

ofGB/T1116.

4.2Appearance

Thecolorofthesilicoreplasticductshouldbeuniform;Theinnerandoutersurfacesshould

beregular,uniformandsmooth,freeofdefectssuchascollapse,pits,holes,tearmarksand

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YD/T841.4—2016

magazinepits;Thecrosssectionshouldbebrightandfreeofbubbles,cracks,blisters,

impuritiesandotherdefects;Theinnerandouterlayersofthesilicoreplasticductshould

betightlycombinedwithoutdisengagement

4.3Color

Thecolorofouterlayerandcolorstripeofsilicoreplasticductshallbeselectedfromtable

1;ColormeetstherequirementsofGB/T6995.2

Table1Colorforsilicoreplasticductidentification

No.123456789101112

ColourBlueOrangeGreenBrownGreyWhiteRedBlackYellowVioletPinkTurquoise

4.4Mark

Theoutersheathofthesilicoreplasticductshouldbemarked.Themarkingmethodcanbedivided

intotwotypes:colormarkingandcolorstripemarking.

Whenusingpipecoloridentification,thepipecolorshouldmeettherequirementsofTable

1;

Whenthecolorstripeisusedforidentification,thecolorofthepipeisgenerallyblack,

andthecolorofthecolorstripeshouldmeettherequirementsofTable1(thecolorofthe

colorstripeshouldbedifferentfromthecolorofthepipe).Thecolorstripeisgenerally

co-extrudedwiththepipe,thewidthofthecolorstripeis1mm-6mm,andthedepthfromthe

outersurfaceofthepipeis0.1mm-0.3mm.Thecolorstripecanbeasinglecolorstripeevenly

distributedontheoutercircumference,suchas1×2,1×3,1×4;itcanbetwoparallelcolor

stripesevenlydistributedontheoutercircumference,suchas2×2,2×3;itcanalsobethree

parallelcolorstripesevenlydistributedontheoutercircumference,suchas3×2,3×3;When

paralleltwoorthreecolorstripes,thespacebetweenparallelcolorstripesis1mm-6mm.

4.5Dimensionsandlength

4.5.1TheDimensionsandlengthofthesilicoreplasticductshouldmeettherequirementsof

Table2.

4.5.2Theex-factorylengthofeachreelofsilicoreplasticductshouldmeettherequirements

ofTable2,anditcanalsobenegotiatedbythesupplierandthedemander,butthereshall

benojointforthesilicoreplasticductinthereel.

Table2Dimensionsandlengthofsilicoreplasticduct

NominalMeanoutsideWallthickness

Length(m）

outerdiameter(mm)(mm)Non-circularity

diameterNominalvaAllowableNominalvaAllowable(%)NominalvalAllowablede

(DN)luesdeviationluesdeviationuesviation

+0.31000,2000,3+0.3%

32/36323.0+0.30≤3

000

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00

34/28343.00

1000,2000,3

40/33400.43.5+0.40

000

46/384604.00

≤51000,1500

50/41500.54.5+0.50

63/546304.501000

Theallowabledeviationofthedimensionsoftheribbedsilicoreplasticductisdeterminedbythesupplierand

thebuyer

4.6Mechanicalandenvironmentalrequirementsforsilicoreplasticduct

TheMechanicalandenvironmentalrequirementsforsilicoreplasticductshouldmeetthe

requirementsofTable3.

Table3Mechanicalandenvironmentalrequirementsforsilicoreplasticduct

No.ItemUnitPerformancerequirement

Hardnessoftheductouter

1HD≥59

surface

Staticfrictioncoefficient

2/≤0.25

ofinnersurfaces

Dynamicfrictioncoefficient

3/≤1.25

ofinnersurface

4TensilestrengthMpa≥18

5Elongationatbreak/≥350%

32/2634/2840/3346/3850/4163/54

6RingstiffnesskN/m2

≥50≥40≥30

Applytensionintheverticaldirection,andwhenthe

deformationoftheouterdiameterreaches50%oftheoriginal

outerdiameter,theloadisremovedimmediately,thespecimen

7Recoveryratio/

shallnotbebrokenorstratified,andtheouterdiametercan

recovertomorethan85%oftheoriginaldiameterwithin10

minutes.

32/2634/2840/3346/3850/4163/54

8MaximumtractionloadN

≥4000≥5000≥6000≥8000≥10000≥12000

-At20℃for2h,theheightwas2m,theweightwas5kg,

9Drophammerimpact/and10specimenswereimpacted.9ormorespecimentsof10

specimensshallnotgetbroken

10Hydraulicperformancetest/Keepthetemperatureat20℃andwaterpressureof2MPafor

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YD/T841.4—2016

15minutes,Thespecimenhasnovisiblecrackandisnot

broken.

Whenitiskeptat-20℃for2hours,thebendingradiusis

lessthanorequalto10timesoftheouterdiameterofthe

11Lowtemperaturebendingtest/duct,andthenitisbentintoaU-shape,andbentoncein

bothpositiveandnegativedirections.Afterbending,there

shouldbenocrackorobviouswhiteduetoforce

12Longitudinalreversion/≤3%

ConnectorsealingNormaltemperaturewater,keepfor24hoursunderthe

13/

performancetestpressureof50kPa,noleakage

Connectionforceofduct32/2634/2840/3346/3850/4163/54

14N

joint≥4000≥6000≥8000

4.7Environmentalprotectionperformance

Whenrequiredbytheuser,Therestrictedsubstanceineachhomogeneousmaterialthattheduct

consistsshallmeettherequirementsinGB/T26572-2011.

5Testmethod

5.1Standardenvironmentforstateadjustingandtest

InaccordancewithYD/T841.1-2008,5.1.

5.2Appearance,colorandmarking

Theappearance,colorandmarkingofsilicoreplasticductsshallbetestedaccordingtothe

provisionsofYD/T841.1-2008,5.2.Markingsizeismeasuredwithverniercaliper.

5.3Dimensionmeasurement

5.3.1Themeanoutsidediameter,wallthickness,lengthandmetererrorofsilicoreplastic

ductsweretestedaccordingtotheregulationsofYD/T841.1-2008,5.3.

5.3.2Theroundnessoftheouterdiameterismeasuredwithaverniercaliperwithanaccuracy

of0.02mm.Takethreespecimensandmeasurethemaximumouterdiameterandminimumouter

diameterofthesamesectionofeachspecimen,thentheout-of-roundnessofthisspecimenis

showninformula(1)

Roundnessoftheouterdiameter=(Dmax-Dmin)/D*100%（1）

Intheformula:

Dmax-Themaximumouterdiameter,theunitismm;

Dmin-Theminimumouterdiameter,theunitismm;

D-Themeanoutsidediameter,theunitismm;

Theaveragevalueofoutofroundnessofthreespecimensistakenasthemeasurement

result.Duringthemeasurement,itisnotallowedtoexertexternalforceontheradialdirection

ofthespecimentoensurethatthespecimenisinanaturalstate.

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YD/T841.4—2016

5.4MechanicalandenvironmentalrequirementsforSilicoreplasticduct

5.4.1Hardnessoftheductoutersurface

Thesilicoreplasticductspecimenwithalengthof100mmistightlysheathedonametalrod

withappropriateouterdiameterandplaceddirectlybelowtheTypeDShorehardness

tester.AccordingtothemethodspecifiedinGB/T2411-2008,theinstantaneoushardnessof

thetestisreadasthemeasurementresult,andthearithmeticmeanvalueistakenasthe

measurementresult.

5.4.2Staticfrictioncoefficientofinnersurfaces

InaccordancewithYD/T841.1-2008,5.17.

5.4.3Dynamicfrictioncoefficientofinnersurface

InaccordancewithYD/T841.1-2008,5.18.

5.4.4Tensilestrength

InaccordancewithYD/T841.1-2008,5.12.

5.4.5Elongationatbreak

InaccordancewithYD/T841.1-2008,5.13.

5.4.6Ringstiffness

InaccordancewithYD/T841.1-2008,5.7.

5.4.7Recoveryratio

InaccordancewithYD/T841.1-2008,5.10.

5.4.8Maximumtractionload

5.4.8.1Preparationoftestspecimens

Takethreesectionsofductwiththelengthof(250±10)mmasthespecimen,andthetwoends

ofthespecimenshouldbecutflat.

5.4.8.2Testequipment

Theaccuracyoftensionequipmentiswithin±1%ofthedisplayedforcevalue.Thespecial

fixtureshallclamptheductwalluniformlythroughouttheductcircumference.

5.4.8.3Testprocedure

Clampthespecimenonthetensileequipmentandstretchitatthespeedof100mm/minuntil

thespecimenyields.Readtheyieldloadofthetestasthetestresult.Ifthespecimenslips

fromthefixtureorbreaksattheendofthefixture,theexperimentshouldberepeated.

Takethearithmeticmeanofthreeeffectivespecimensasthetestresult.

5.4.9Drophammerimpacttest

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YD/T841.4—2016

InaccordancewithYD/T841.1-2008,5.5.

5.4.10Hydraulicperformancetest

Taketwocompletesilicoreplasticductsspecimenswithlengthnotlessthan400,sealthe

endofthespecimenaccordingtotheA-typesealingmethodspecifiedbyGB/T6111,clampthe

specimentothetestingequipment,slowlyinjectwater,watertemperatureat(20±2)℃,Reach

thespecifiedpressurewithin1minuteandmaintainfor15min,ifthespecimenhasnoobvious

expansion,noleakage,orfracture,itisqualified.

5.4.11Lowtemperaturebendingtest

5.4.11.1InaccordancewithGB/T7424.2-2008,E11B.

5.4.11.2Theradiusofthebarrelis10timestheouterdiameterofthespecimen.

5.4.11.3Bendonceinthepositiveandnegativedirectionsrespectively,andbendtheduct

intoUshapeeachtime.

5.4.11.4Putthespecimeninalowtemperaturebox,keepitat-(20±2)℃for2hours,then

testimmediately,andkeepitinthebentstatefor30secondseachtime.

5.4.11.5Cancelthebendingforceappliedtothespecimenandletthespecimenrecover

naturally.

5.4.11.6Inthebendingstateand30minutesafterrecovery,checkwhethertherearecracks

orobviousstresswhiteningonthesurfaceofthespecimen.

5.4.12Longitudinalreversion

InaccordancewithYD/T841.1-2008,5.14.

5.4.13Measurementofmetererror

Useasteeltapetomeasurethelengthalongthesilicoreplasticductatanappropriatelength,

subtractthelengthdeterminedbythemeternumberfromthemeasuredlength,anddivideby

themeasuredlength,thatisthemetererror.

5.4.14Connectorsealingperformancetest

Taketwocompletesilicoreplasticductsampleswithappropriatelengthsandconnectthemwith

aspecialconnectorforsilicoreplasticductaccordingtothetoolsandmethodsprovidedby

themanufacturer.Oneendissealedwithaductplug,andtheotherendisconnectedtoaspecial

fixtureforwaterinjection.Thetemperatureofwaterisnormal.Thepressureis50kPa,keep

itfor24hours.Ifthetestedconnectordoesnotleak,itisqualified.

5.4.15Connectionforceofductjoint

Taketwocompletesilicoreplasticductwithlengthof(200±5)mm,connectthemwithspecial

connectorofsilicoreplasticductaccordingtothetoolsandmethodsprovidedbythe

manufacturer,clampthesampletothetensiletestingequipmentwithspecialfixture,andthe

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tensilespeedis(100±5)mm/minuntiltheductconnectorispulledoutorthesilicoreplastic

ductispulledout,themaximumtensileloadofthetestisreadasthetestresult.Inthis

way,threegroupsoftestsareconducted,andthearithmeticmeanvalueofthethreetestresults

istakenasthetestresult.

5.4.16Environmentalprotectionperformance

InaccordancewithYD/T841.1-2008,5.21.

6Inspectionrules

6.1General

Theproductsshallbeinspectedbyqualitydepartmentofthemanufacturerandbeattachedwith

qualificationlabelsbeforethedelivery.

6.2Classificationofinspection

Thequalityinspectionoftheproductisclassifiedintodeliveryinspectionandtype

inspection.TheinspectionitemsandcorrespondingclassificationsareinTable4.

Table4Theinspectionitems,testmethod,classificationandsamplingproportion

classification

ClausenumberofClausenumber

No.InspectionitemTypeinspectionDelivery

requirementsoftestmethod

itemsinspectionitems

1Appearance4.25.2√√

2Color4.35.2√√

3Mark4.45.2√√

4Dimensions4.5.15.3√√

5Length4.5.15.3√√

6Metererror7.1.35.4.13√√

Hardnessoftheduct

7Table3No.15.4.1√

outersurface

Staticfriction

8coefficientofinnerTable3No.25.4.2√√

surfaces

Dynamicfriction

9coefficientofinnerTable3No.35.4.3√

surface

10TensilestrengthTable3No.45.4.4√√

11ElongationatbreakTable3No.55.4.5√√

12RingstiffnessTable3No.65.4.6√√

13RecoveryratioTable3No.75.4.7

14MaximumtractionloadTable3No.85.4.8√

15DrophammerimpactTable3No.95.4.9√

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Hydraulicperformance

16Table3No.105.4.10√

test

Lowtemperaturebending

17Table3No.115.4.11√

test

18LongitudinalreversionTable3No.125.4.12√

Connectorsealing

19Table3No.135.4.14√√

performancetest

Connectionforceofduct

20Table3No.145.4.15√√

joint

Environmentalprotection

214.75.4.16√

performancea

Note1:thefrictionperformanceoftheinnerwalloftheductisjudgedbasedontheexperimentalresults

ofthestaticfrictioncoefficient.Thedynamicfrictioncoefficientcanbeusedasareferenceforengineering

construction.

Note2:whentheconnectorisprovidedintheex-factoryproduct,Connectorsealingperformancetest

Connectionforceofductjointandconnectionforcetestshallbeconducted

6.3Deliveryinspection

6.3.1Group

Agroupisdefinedasproductswithsamebatchofrawmaterials,thesameprocessproduction,

thesamespecification,thesamebatchofdelivery.

6.3.2Deliveryinspectionitems

SeeTable4.

6.3.3Samplingschemeofdeliveryinspectionitems

Thedeliveryinspectionitemsareclassifiedinto100%inspectionitemsandsamplinginspection

items.Exceptforcolorandapperanceare100%inspectionitems,otherdeliveryinspection

itemsaresamplinginspectionitems.ThesamplingfordimensionstestisaccordingtoGB/T

2828.1-2012,thenormally-test-oncesamplingscheme,andtheinspectionleveltakeslevelII

withAQL4.0.Takesamplesbasedonmanufacturinglength(reel),ThesamplingschemeisinTable

5.

Amongthequalifiedsamplingproducts,enoughsamplesarepickedrandomly,andotherdelivery

inspectionitemsinTable4shallbecarriedout.

Table5Thesamplingscheme

NumberofgroupNumberofspecimenNumberofreceivedNumberofrejected

NnAcRe

2～25301

26～901112

91～1502023

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151～2803234

281～5005045

6.3.4Criterionofdeliveryinspection

Theproductisunqualifiedifanyitemofthe100%inspectionitemsisfailed.Disqualification

shallberemovedfromtheinspectionlotandnotallowedex-factory.Accordingtothesampling

schemeinTable5,iftherearelessthanorequaltoAcqualifiedsamplesoutofNsamples

inanysamplingitem,thebatchofsamplesshallbejudgedasqualified.Iftherearemore

thanorequaltoReunqualifiedsamples,itwillbejudgedasunqualified.Thegroupof

unqualifiedproductsshallnotallowedex-factory.

6.4Typicalinspection

6.4.1Typicalinspectionitems

SeeTable4.

6.4.2Samplingfortypeinspection

Thetypeinspectionsamplesshallbepickedrandomlyfromtheproductsthatarequalifiedin

thedeliveryinspection.

6.4.3cyclefortypeinspection

Normallythetypeinspectioniscarriedoutonceayear.Theinspectionshallbecarriedout

whenoneofthefollowingcasesoccurs:

a)Newproductororiginalproducttochangetheproductionsiteofthefinalizationoftrial

production;

b)Thestructure,materialorproducingprocesschangealot,mayinfluenceperformanceof

theproduct;

c)Themanufactureresumeproducingafter6monthsorlongerinterval;

d)Theresultsofdeliveryinspectionhaveobviousdifferencesfromtheresultsofthelast

timetypeinspection.

6.4.4Criterionoftypeinspection

Ifallitemsinthetypeinspectionarequalified,thetypeinspectionisqualified.Ifany

oftheinspectionitemsisunqualified,doubleamountofspecimensshallbepickedfromthe

samegroupandtheunqualifieditemshallbecarriedout.Ifallpasstheinspection,thetype

inspectionisqualified,andiftherearestillunqualifieditems,thetypeinspectionis

justifiedasunqualified.

6.4.5Re-inspection

Ifthetypeinspectionisjustifiedasunqualified,themanufacturershallbefoundoutthe

cause.Productidentificationoracceptanceshallbestoppedbeforeacceptablecorrective

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actionsaretaken.Aftertheimprovementmeasuresaretaken,t