Designation:D2541–93(Reapproved2001)StandardTestMethodforCriticalDiameterandDetonationVelocityofLiquidMonopropellants1ThisstandardisissuedunderthefixeddesignationD2541;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethod2coverstheevaluationoftwoproper-tiesofahigh-energyliquidpropellant.Inoneform,thecriticalinternaldiameterisdeterminedinagiventypeofmetalorplastictubingbelowwhichpropagationofstablehigh-velocitydetonationwillnottakeplace.Inthealternativeform,whichusesmorematerial,detonationrateisconcurrentlymeasured.Thecompositedonorofeithersizemaybeusedinmostinstancestoinitiatedetonationinexperimentaltrapdesigns.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.2.Terminology2.1Definition:2.1.1criticaldiameter—thelargestdiameterthatwillnotdetonatewhenthedonorisexploded.3.SummaryofTestMethod3.1Variousdiametersoftubingarefilledwithpropellant,andanattemptismadetocausethepropellanttodetonatebyuseofasecondarydetonatingmedium(thedonor).4.SignificanceandUse4.1Itshouldbeemphasizedthatthecriticaldiameter,asdeterminedundertheseconditions,isvalidonlyfortheseconditionsandisnotanintrinsicpropertyofthesample.Onevitalparameterinestablishingthecriticaldiameteristhatofconfinementofthetestspecimen.ThefactthatdetonationoccursordoesnotoccurinType347stainlesssteeltubedoesnotnecessarilyimplythatthesameresultswouldbeobtainedinanaluminum,copper,glass,etc.,tubeofsimilardimensions.Type347stainlesssteeltubeisacceptableforastandardreferencetest,butforpracticalapplication,diame...
