AcetyleneCylinders：乙炔气瓶

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1、AcetyleneCylindersScopetodayCylindersinfiresAcetyleneaspecialproblemWhyisUKdifferent?Whatcanbedoneaboutit?ResearchCylindersinFiresAllgascylindersmayexplodeinfiresIncreasinggaspressureovercomesreducingsteelcylindershellstrengthat~300oCCoolingrestoresshellstrengthandreducesgaspressu

2、reButAcetylenemightre-heatAcetyleneisfuelgasofchoiceFlametemperatureof3150oCandlighterthanairCarbon-Carbontriplebond–reactive,notunstable3xAcetylenereactionsofinterestinfireDecompositionnotspontaneous!-needs>350oCC2H2+HEAT→2C+H2+moreHEATSevereshocktoaHOTcylinder?Acetylene(C2H2)Ace

3、tyleneCylindersPorousmonolithicmassAcetylenedissolvedinasolventsmallcellsactasflamearrestorDesignedtostopdecompositionSteelheattreatedLowfillpressureButmassisaheatinsulatorAcetylenecylindershaveahardlife!–themythofcoldimpacteffectAcetylenecylindertestingDroptestElevatedtemperature

4、testBackfiretestImpactresistancetest90gPlasticexplosivechargeImpactstabilityofAcetylenecylindersImpactresistancetestTestprotocolrequirescylindertodentby25%ofitsdiameter.Exampleshownabout50%PorousmassnotdamagedNodamageotherthandentitselfNocracksNosharp-edgeddeformationsNoindication

5、ofdecompositionColdShockGasexpertopinionForF+RS,PoliceandHighwaysAgency“MechanicalshockalonetoacoldAcetylenecylinder,whichremainsintactandhasnotbeenexposedtofire,cannotinitiatedecomposition.”AcetylenevsPropanePropaneAcetyleneCylindercontent(Typical)47Kg8KgGasdensity1.550.9Flametem

6、pwithO225003200Flammabilitylimitsinair2.2-9.5%2.5-81%Maxfillpressure(Bar)1018Cylinderburstpressure(Bar)67105RelativeBTUyield14CuMetresOxygenneeded41SpecialriskBLEVEDecompositionCutting?YesYesBrazing?YesYesWeldingNoYesUKprotocolforDAinFiresisdifferent!Since2003/2004Initial200mhazar

7、dzonewhilstfactsestablishedZonereductionbasedondynamicriskassessment24hourprecautionarycoolingAcetylenecylindermaynotbemovedorventedBUT–often200mEXCLUSIONzoneheldfor24hours–causesmassivedisruption!WhytheUKprotocolbecameso?DeathofJohnWixey1987HSLExperimentsin1994FireServicetraining

8、contentMythandfolklore!The‘London