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TFRUS., EconomicandSocial  Council @@  2 `*Times New RomanTTTable_A d { f'X'xXX'xXXX'x  _&%XX'x&%%&>J  H4>>K S[ c 4"$XHFRUS.,_TRANS_/WP.15/2000/USFR, 12 R page@    2  A  8   %% J  K.>>( v `J4">>X4"NKX'xX%&X'xXXX'x(Y2f$ "h!X'xXX'xXXX'x  $35=EMU]em1(1)(1)(1)(1)(1)(1)(1)(1)$359=AEIMQ2--------$35;AGMSY_3a)a)a)a)a)a)a)a)3|xo \  `*Times New RomanTTC\  P6QP\  `*Times New RomanTTXXP\  P6QXP2xA`ArialTTomanTTxP7P2xA`ArialTTomanTT&&xP7&P\  `*Times New RomanTT&&J\  P6Q&P2xA`ArialTTomanTT  xP7 P2 `*Times New RomanTT&& P7&P2 `*Times New RomanTTXX P7XP(>h$XGXXGXXXGHP LaserJet 4L,,LL,,0##37=CIQYag1.a.i.(1)(a)(i)1)a)yOf( f{ghDijVklDmn^oK(singU(5hCEKQW]cioAutoList11.1.1.1.1.1.1.1.(;$25h  0  .3  0  (EhCEKQW]cioAutoList21.1.1.1.1.1.1.1.(Z3z6$ "h!X'xXX'xXXX'x  "h!X'xXX'xXXX'x  _TRW6&* X3' Letter6&A43'TRH4U 1h D{ !#XH  ??US., UEAz|s# p @ H@Es#s#?'E dEE ??'<F dE<F ?&%XX'x&%%&UK??., UNITED  R KeGR Y!# 77 7!NKXX%&X'xXXX??UK.,WGCz|1m ` @ H@E1mJ1m_&%XX'x&%%&UK??., NATIONS &%%&   e X'xX%&??UK., UEAz|   p @ H@E      G &%XX'x&%%&UK??., Distr. |* _ e 0 G GENERAL G#G#  e  e 0 G _TRANS/WP.15/2000/12_ G#G#  e 0 G _6_Ԁ_March_Ԁ2000 G#G# 0 e 0Ge#e# G#G# 0 e 0Ge#e#Original:_ENGLISH_Ԁ G#G# &%%&ECONOMICCOMMISSIONFOREUROPE   T4U 1h D{ !#eGR NT&%%& INLANDX'xX%&TRANSPORT&%XX'xԀCOMMITTEE b WorkingPartyontheTransport |* ofDangerousGoods X (Sixtyeighthsession,agendaitem4_(a),_Geneva,1519May2000)    PROPOSALSTOALIGNTWOPARTSOF_ADR_ԀCOVERINGTHEFITTINGOFSAFETYVALVESTOPRESSURISEDTANKS/TANKERSSafetyValves_Marginals_Ԁ211233and212_233_ 8 TransmittedbythekEuropeanLiquefiedPetroleumGas_Associationkl...l_Ԁ_(AEGPL)_____________________ z! __  ___* ddd Xdd Xdd X##,LL@+  5" $ & C5 Z+ M 7!o Y 77 7!NZ <( '  7!o YN<0 s  Executive_Summary: s Itisproposedtoalignthereliefvalverequirementsfortankerswiththosefor 3$ ( portable_tanks._ s `!s `! 0 s  s `!s `! 0 s  Actiontobetaken: s _Amendment_Ԁto_marginals_Ԁ211233and212_233________________._&u#+s `!s `! ____________________________________________________________0 s  Relateddocuments: s UN_Recommendations.___F<:[) &.s `!s `!C    F_GE.00_Ԅ  ,)0 > 1.INTRODUCTION   USUK.,iL>>Y I v T`_Jj Y'  Ni  Therestructuredtextof_ADR_Ԁtobepublishedin2001cmomntainstwooptionsforthefittingandsizingofsafetyvalvestopressuretanks,whenrequired,anditisnecessarytoalignthesetworequirements.  Theexistingrequirementsin_marginals_Ԁ211233and212233state:  Safetyvalvesshallmeetthefollowingrequirements:  Para.(1).Shellsintendedforthecarriageofgasesof1,2,or4,maybeprovidedwithnotmorethantwosafetyvalveswhoseaggregateclearcrosssectionalareaofpassageattheseatingor_seatings_Ԁshallnotbelessthan10cmnn2nnper30_m3_orpartthereofofthe_receptable_scapacity. t    Theseshells.............valvesisprohibited.  Para(3)Shellsintendedfor........tothecompetentauthority.  Theaboveisincludedintherestructured_ADR_Ԁtextinchapters6.8.3.2.6to6.8.2.3.2.12.  Inthe2001editionof_ADR_,therewillbeareferencetoPortableTanksinAppendixB.1eandthecontentofthisisboaosedontheUNrequirementsforPortabletanksandinparticularpara.6.7.3.7.Pressurereliefdevices.  Theaboveisincludedintherestructured_ADR_ԀtextinChapter6.7.L -Eh(#%L  ,   ,O2Eh  2  .3  0    JUSTIFICATION ,Oz݌|## Ќ    Thecurrentprovisionsin_ADR_Ԁforsafetyvalvesongastankersarebasedonnomorethantwovalveswithatotalcrosssectionalareaof20cm2per30m3orpartthereoforthereceptaclescapacity.Thetext  adoptedforportabletanks,inlinewiththeUNrequirementsforportabletanks,relatessafetyvalvecapacitytoreceptaclesurfacearea,basedonthefactthatheattransferintothevesselwillbethroughthereceptaclewallsandwillbeproportionaltoexposedarea.Attachedsummariesindicatethatthetwomethodsgivesimilarlevelsofsafetyandthisproposalbringsconsistencyofapproach. 3.0  PROPOSAL $8"##   Itisproposedtoreplacethebeginningofmarginal211233andmarginal212233withthefollowingtextinconformancewiththerestructuredchapter6.7onportabletankswhichinturnreferstoUNchapter6.7:  Para(1)0 Shellsintendedforthecarriageofgasesof1,2,or4maybeprovidedwithvalvesthe ")!' combineddeliverycapacityofwhichshallbesufficientthat,intheeventoftotalfireengulfment,thepressure(includingaccumulation)insidetheshelldoesnotexceed120%ofthesetpressureofthesafetyvalve.Springloadedreliefdevicesshallbeusedtoachievethefullreliefcapacityprescribed.Inthecaseofmultipurposetanks,thecombineddeliverycapacityofthesafetyvalvesshallbetakenforthegaswhichrequiresthehighestdeliverycapacityofthegasesallowedtobetransportedintanks.  # #   Remainderofinsertionofthewholeparagraph6.7.3.8.1.1oftheUNRegulation. 0h(/ Ї  0  0 ##0I # #0 I #I #0v # #0v #v #0##0##0T##0`T#T#0`#`#0##0##0##0_##0J_#_#TRANS/WP.15/2000/12 J#J#   0  0 ##0I # #0 I #I #0v # #0v #v #0##0##0T##0`T#T#0`#`#0##0##0##0_##0J_#_#fepefgpageghfPfhi3 J#J# i  Para(2):Unchanged.  Para(3):Unchanged.j  L j