WPC( e0IzLI\U=R؛]0 gFYΆqٺۈj$3 NT-6V 9\kQ/;Ŵo>'ӑFhxd2tbOW$k4C~ϊMJIy/4 1rXbMKmvTCUQqb.vao3cf9x"9R%0~ְH._:˛< &OGOZYOshMHt4R^æ\tbȺ3sMAQBG-XEcOHT@{lHyPQW{<_+i-;n&8w3Yۏby hjH'I2!⸵U5bjeƖM3Ѿ#Nӏq{Ӑ>G` C2 b(,[g&$wPu/;$i.%U&B %HN 0t 0tU .{ 0r 0 0 0 0j 0z5 0 0v 0B 0\0 0w 0 D+ 0 0= 0> AQ -"n=" 0fA&#!&N'^ 'w'4'( m(\  `*Times New RomanTT'   "UN/SCETDG/17/INF 2 UN/ECE0UN/ECE .   h:Default ParaDefault Paragraph FontXXXW\  `*Times New RomanTTW        W\  `*Times New RomanTTW8#,TitleTitle      /% !EL!/C%2A`ArialTTC     UK   US     W\  `*Times New RomanTTW>4X` hp x (#>      %2A`ArialTTL 6Bullet abcBullet abc  XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW  Z :Bullet i ii Bullet i ii iii  XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW  Z :Bullet (CircBullet (Circle)  XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW  Z#:Bullet (SquaBullet (Square)   X   XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW   X   D 2RenumberRenumber  XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW  T :Default TextDefault Text  XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW  T#:Main HeadingMain Heading      /% !EL!/XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW>4X` hp x (#>      P 8Number ListNumber List  XXXC%2A`ArialTTC     UK  US     W\  `*Times New RomanTTW  <G` .headerheader  4      UK  US     >4X` hp x (#>  P8page numberpage numberXXXW\  `*Times New RomanTTW        W\  `*Times New RomanTTW<D` .footerfooter         UK  US     >4X` hp x (#>    \'  _J:6zHa p @ H@E!TT!T  !!""  XG>XXXXXG>    UKUS.,   !!B#B#    B#B#!!US.,UK.,    XX    (Y2\$ I!  'dxd Level 1 Level 2 Level 3 Level 4 Level 5(Y2\$ I!  ($    (Y2\$ I!  C<< c  \"  _  $4 X$    UKUS.,  XG>XXG>XXXG>      XXG>@    1  A        3|x \  `*Times New RomanTTC\  P6QP\  `*Times New RomanTTXXP\  P6QXP%2A`ArialTTomanTTg2PQP%2A`ArialTTomanTTXXX2PQXP\  `*Times New RomanTT\  P6QP\  `*Times New RomanTT&&J\  P6Q&P(>I$HP LaserJet IIIP0q{}'UUy'qDU I!  _TRX6&* X3' Letter6&A43'T   XG>XXXXXG>    UKUS.,    צXXצ UN/_SCETDG_/17/INF.10    &[j%SubCommitteeofExpertsontheTransportofDangerousGoods(SeventeenthSession,Geneva,615December1999,agendaItem2(a)and2(b))  DEVELOPMENTOFPROVISIONSFORTHETRANSPORTOFGASES    UKCommentsonProposalscontainedinUNDocumentST/SG/AC.10/C3/32/Add.1presentedat  @  the16thSessionofUNSubCommitteeofExperts,514July1999.       TransmittedbytheExpertfromtheUnitedKingdom l    Background  $  1.TheWorkingGrouponTransportableGasReceptaclesmetfrom5to8July1999duringtheSixteenthSessionoftheSubCommitteeofExperts.ThereportoftheWorkingGroupiscontainedindocumentST/SG/AC.10/C3/32/Add.1.2.TheUnitedKingdomwishestosubmitthisInformationPapercommentingonthereportcontainedinST/SG/AC.10/C3/32/Add.1.Thispaperisrequestedtobeconsidered attheSeventeenthsessionoftheUN ( SubCommitteeofExpertswithintheGasesWorkingGroupofthatSubCommittee,tobeheldbetween6to9December1999.3.ThisINFPapercommentsontheaboveWorkingGroupReport,providesinformationandoffersfurtherproposedtextwhereappropriate.MinoreditorialamendmentswillberaisedbytheUKduringdiscussionattheGasesWorkingGroupmeeting. Discussion  t  Proposal2: ` DefinitionsandGeneralProvisionsinPart2.  ,  4. RegardingParagraph6.  |"" TheabovedocumentST/SG/AC.10/C3/32/Add.1.proposestointroducetheterm highlytoxicgasesinto 8$$ theUNModelRegulationsasopposedtousingtheestablishedphrase gaseswithanLC50lowerthanor %| % equalto200ppm.Useofthetermhighlytoxicispotentiallyconfusingasitconsequentlyintroducesthe %X!& conceptthatcertaingasesarelesstoxicandthereforespecificdefinitionswouldberequiredtodistinguishbetweentheseterms.Thetermhighlytoxicdoesnotofferacriteriontojudgewhatistoxicwithoutfurther '#( clarification.Thishasthepotentialtoconfusetheuser,consignororconsigneeleadingtopotentiallydangerousclassificationofdangerousgoods.TheUKthereforeopposesthisproposalandsuggeststhattheterm gaseswithanLC50oflowerthanorequalto200ppmisretained.Thisterminologydefineswhat <*%+ isconsideredtoxicandcanbeusedandinterpretedeasily.TheuseofthetermisalsoconsistentwithcurrentEuropeanENstandardsandRID/_ADR_.   +\'- 5.ThedecisionofOECDtointroducethetermDiscriminatingDoseorFixedDoseasatestoforaltoxicityforLD50,mayalsoaffectthetermhighlytoxic. .)0   d/*1 & p  6.Provisionshouldalsobemadefornonrefillableandcompositegascylinders.TherelevantEuropeanstandardsareprEN12205fornonrefillablecylinders,andprEN12245andprEN12247forcompositegas cylinders.Thesecouldbeusedasastartingpointfordiscussion'p,   `     h   Proposal3: ` Specialpackingprovisionsfordangerousgoodsofclass2inchapter4.1 p 7. RegardingParagraphs9 to11and15.   ( a)TheuseofSafetyReliefDevices(SRDs)promotedsomediscussionatthemeetingof5to8July1999,asthereisadifferenceinphilosophybetweenmostofEuropeandNorthAmerica.TheUKviewisthatSRDsshouldonlybefittedtoreceptaclescarryingliquefiedflammablegasessuchasLiquefiedPetroleumGas(LPG).ThejustificationforthisliesinthenumberofrecordedincidentswhereflammablegasreceptaclesfittedwithSRDshaveoperatedinafiresituation,dramaticallyreducingthehazardofcylinderseitherexplodingorbeingpropelledgreatdistances.b).Overanumberofyears,theUKhasstudiedincidentswherefireshavetakenplaceinvolvingflammablegasreceptacles.TheUKHealthandSafetyExecutive(HSE)havealsoconductedstudiesintothebehaviourofflammablegascylindersinafirebothwithandwithoutSRDs.Thesestudiesconcludedthatintheeventofafire,missileprojectiondistancesarefargreaterforLPGcylinderswhichwerenotfittedwithSRDsthanthosewhichwerefittedwithSRDs.Thisdataisalsoborneoutbyactualincidentinformation.TwomajorincidentsoccurredintheUKinthemid1990swherevehicleswereinvolvedinaccidents.Inbothcases,thevehiclescarriedanumberofLPGcylinders,someofwhichwerefittedwithSRDsandsomenot.ThecylindersnotfittedwithSRDsexplodedintomanypiecesandtravelledgreatdistances(~100m),whilstthosefittedwithSRDseitherresistedexplosionandremainedintact,orwerepropelledarelativelyshortdistance(<25m).c).Alsointheearly1970s,theUKHomeOfficeconductedanumberoffiretestsofLPGcylindersinvolvedindomesticandcommercialfires.TheoverallconclusionswerethatthefittingofSRDssubstantiallyreducedtherisksofextensivefireandexplosion.TheresultshavebeeninterpretedandpublishedinaseriesofCodesofPracticepublishedbytheUKLiquefiedPetroleumGasAssociation(LPGA)andtheUKHomeOfficeFireServicereports.Someexamplesofthisguidanceare;B.M  hp x XB0     i) M TheFirePreventionGuideSafeUseandStorageofLiquefiedPetroleumGasin    ResidentialPremises(1976); "" K+ ` hp x M  XK  ̀ii) ` LPG(RP)34andLPG(RP)39dealingwithbutaneandpropanerespectively; "#   0  0` ""  iii) ` TechnicalMemorandafromtheLPGasAssociationTMNo.17(1985)settingouta h$% policyforthefittingofSRDstoLPGcylindersandTMNo.34(1992)updatingthatpolicy; ` "` "    `     h     ̀iv) ` HSEGuidanceNoteCS4(1986)dealingwiththesafeuseofLPGcylinders. '@#) d).InthepreviousdocumentST/SG/AC.10/C.3/1999/24,EIGAhavestatedthattherisksarisingfromaleakingSRDfaroutweighthepotentialbenefitsofSRDsduringafire.TheUKdisagreeswiththisstatementasitdoesnottakeintoaccountthestorageandpositioningofthecylinderorthereliabilityofSRDs.IntheexperienceoftheUK,SRDsfittedtoLPGreceptaclesveryrarelyleak,andthebenefitsintheeventofafirearewellknown.e).However,withothergaseswhicharenoncryogenic,theUKsupportstheproposalsfortheremovalofSRDsingasreceptacles.Forexample,withAcetylene,thereisresearchandexperienceintheUKwhichshowsthatinmanycasesSRDseitherdontworkortheyprovidethebasisforfeedingafire. p0+3 Testscarriedoutin199495bytheUKHealthandSafetyExecutiveconcludedthatAcetylenecylindersfittedwithfusibleplugscouldexplode,beforethefusibleplugreacheditsoperatingtemperature.Evenwhenthefusibleplughadoperated,thecylindercouldstillexplode.ItwasalsofoundthatAcetylenecylindersfittedwithburstingdiscscouldexplodebeforethedesignpressureoftheburstingdiscwasreached.f).TheUKthereforeopposestheproposalnottofit_SRDs_Ԁtoliquefiedflammablegascylinders.However,supportisgiventoproposalstoremove_SRDs_Ԁfromallothergascylinders,includingAcetyleneandthosecarryingtoxicgases,withtheexceptionofliquefiedcryogenicgasreceptacles(seeProposal4).g)Itisgenerallyaccepted(internationally)that_SRDs_Ԁshouldnotbefittedtoanyreceptaclescontainingtoxicgases,evenwherethegashasasubsidiaryflammablerisk.TheUKsupportsthisview.̀8. RegardingParagraph13 andPackingInstructionP200  ,  Referringtospecialprovision fofP200,thestatedmaximummassofcontents(thefillingfactor)isforclimaticarea1anddoesnottakeintoaccounttheothertwoclimaticareas.Thefillingfactorsforareas2and3areasfollows;_i_)Forclimaticarea2,themaximummassofcontentsperlitreofcapacityequals0.95timesthedensityoftheliquidphaseat450C;inadditionthevapourphaseshouldnotdisappearbelow550C. X ii)Forclimaticzone3,themaximummassofcontentsperlitreofcapacityequals0.95timesthedensityoftheliquidphaseat400C;inadditionthevapourphaseshouldnotdisappearbelow500C.  9.Inaddition,entryUN1965 HydrocarbongasmixturesisanNOSentryandcallsforspecialrequirementsmandz.200missatisfactory,however,200z(2)omits(f)forfilling.Thisneedstobeaddedafter200(6).10. RegardingParagraph18 andPackingInstructionP200  8 TheUKsupportsspecialprovision kofP200,conditionaltopassingastresscorrosiontestratherthan  asustainedloadcrackingtest.11.TableonPages13to21.AstheTableisextractedfromMarginal2250ofthe_ADR_,theasterisksneedtobeclarifiedinalegendaccompanyingthatTableasfollows;*/=Notapplicabletoreceptaclesmadeofcompositematerials. !@" **/onPage13=Consideredaspyrophoric. "# **/onPage19=Formixturesofgasesof20F,UN1965,themaximumfillingmassperlitreofcapacity #$ isasshowninthegraph(thisgraphshouldbereproducedfromMarginal2250of_ADR_). l$% ***/=Consideredaspyrophoric. H% & 12.PackingInstructionsP201and202.TheUKfeelsthattheappropriategasesshouldbereferencedhereasappropriateforeachPackingInstruction,i.e.P201forUN3167,3168,3169andP202forUN3353.Proposal4:Requirementsfortheconstructionandtestingofpressurereceptaclesforgasesincludingpressurereceptacleswhichareelementsof_MEGCs_.13. Regardinganewsection(6.2.5)dealingwithclosedcryogenicreceptacles.  -H)0 TheUKrecognisesanomissionintheUNpapertodealwithclosedcryogenicreceptacles.   `     h    x0+3 Therefore,theUKproposesanadditionalsectionusingtherelevantsectionsof_ADR_,i.e.fromSection6.2.3.4oftherestructuredversionof_ADR_.Thiswouldalsoincorporatetheproposalscontainedinsquarebracketswithinsection6.2.1.3.4ofdocumentST/SG/AC.10/C3/32Add1,asfollows; Proposedadditionalsection6.2.5ClosedCryogenicReceptacles  p Thefollowingrequirementsapplytotheconstructionofclosedcryogenicreceptaclesforgasesofclassificationcode3:6.2.5.1Allthemechanicalandtechnologicalcharacteristicsofthemetalusedshallbeestablishedforeachreceptacleattheinitialinspection;withregardtotheimpactstrengthandthebendingcoefficient;   `     h   6.2.5.2Ifothermaterialsareused,theyshallresistbrittlefractureatthelowestworkingtemperature p  ofthereceptacleanditsfittings;6.2.5.3Receptaclesshallbefittedwithasafetyvalvewhichshallbecapableofopeningattheworkingpressureshownonthereceptacle.Thevalvesshallbesoconstructedastoworkreliablyevenattheirlowestworkingtemperature.Theirreliabilityoffunctioningatthattemperatureshallbeestablishedand T  checkedbytestingeachvalveorasampleofvalvesofthesametypeofconstruction;6.2.5.4Theventsandsafetyvalvesofreceptaclesshallbesodesignedastopreventtheliquidfromsplashingout;   `     h      p 6.2.5.5Receptacleswhosefillingismeasuredbyvolumeshallbeprovidedwithalevelindicator; | 6.2.5.6Thereceptaclesshallbethermallyinsulated.Thethermalinsulationshallbeprotectedagainst 4 impactbymeansofcontinuoussheathing.Ifthespacebetweenthereceptacleandthesheathingisairless(vacuuminsulation),theprotectivesheathingshallbedesignedtowithstand,withoutdeformation,anexternalpressureofatleast100kPa(1bar).Ifthesheathingissocloseastobegastight(e.g.inthecaseofvacuuminsulation),adeviceshallbeprovidedtopreventanydangerouspressurefromdevelopingintheinsulatinglayerintheeventofinadequategastightnessofthereceptacleoritsfittings.Thedeviceshallpreventmoisturefrompenetratingintotheinsulation. \  Detailedmeasurestofulfilthesegeneralrequirementsshouldcomefromtheappropriatecodesandstandards.Proposal7:requirementsforthedesign,constructioninspectionandtestingof_MEGCs_.14. RegardingParagraph35.  `$% UKindustryoperatesmanyhundredsof_MEGCs_ԀcontainingHydrogenandCO.Eachofthesecanholdupto250transportablepressurereceptaclesfittedinbanksof5000litres,andthesearrangementshavebeeninaccordancewithaUKApprovedCodeofPractice,publishedby_HSE_ԀandtheBritishCompressedGasesAssociation.ItfollowsmanyyearsofsafeoperationoftubeandreceptacletrailersbothinUKandmuchofEurope.Inaddition,_CEN_/TC23/SC3/WG5isdevelopingastandardwhichdefinesanisolationrequirementof5000litresandhasbeenagreedbyallparticipatingEuropeanMemberStates.Ifasmallerlimitof3000litreswasadopted,thiswouldhaveaverylargeimpactonUKandEuropeanindustry.ThereforetheUKopposestheintroductionofareductioninquantitiestobecarried.̀  _____________