ASTM_D_2420_-_13_2018.pdf

Designation:D242013(Reapproved 2018)Standard Test Method forHydrogen Sulfide in Liquefied Petroleum(LP)Gases(LeadAcetate Method)1This standard is issued under the fixed designation D2420;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method2covers the detection of hydrogensulfide in liquefied petroleum(LP)gases.The sensitivity of thetest is about 4 mgm3(0.15 to 0.2 grain of hydrogen sulfide per100 ft3)of gas.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D1193 Specification for Reagent WaterD1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1835 Specification for Liquefied Petroleum(LP)Gases2.2 GPA Standard:4GPA 2140 Liquefied Petroleum Gas Specifications and TestMethods3.Summary of Test Method3.1 Vaporized LPgas is passed over moist lead acetate paperunder controlled conditions.Hydrogen sulfide reacts with leadacetate to form lead sulfide which produces a coloration on thepaper varying from yellow to black,depending upon theamount of hydrogen sulfide present.4.Significance and Use4.1 Liquefied petroleum gases and their products of com-bustion must not be unduly corrosive to the materials withwhich they come in contact.The potential personnel exposurehazards of H2S also make the detection and measurement ofhydrogen sulfide important,even in low concentrations.Inaddition,in some cases the odor of the gases shall not beobjectionable.(See Specification D1835 and GPA 2140.)5.Interferences5.1 Methyl mercaptan,if present,produces a transitoryyellow stain on the lead acetate paper that will fade completelyin less than 5 min.5.2 Other sulfur compounds present in liquefied petroleumgas do not interfere with the test.6.Apparatus and Materials6.1 Apparatus for Detecting Hydrogen Sulfide in LiquefiedPetroleum Gas,as shown in Fig.1 or commercially availableapparatus.6.2 Lead Acetate Test PaperCommercially available testpaper is satisfactory.Alternatively,the test paper may beprepared by dipping strips of smooth filter paper in 5%aqueous lead acetate solution and removing the excess solutionwith a clean blotter.The strips of paper shall be approximately50 mm long and 10 mm wide and contain a 3 mm hole nearone end so they will hang freely vertical in the test apparatus.6.3 Gas Flow IndicatorCapable of measuring flow ratesin the range of 2 L to 3 L of gas per minute.A wet test meterrotameter and mass flow controller have been found to besuitable.6.4 WaterUnless otherwise indicated,reference to watershall be understood to mean reagent water that meets therequirements of Type II or III of Specification D1193,ordistilled water.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.H0 on Liquefied Petroleum Gas.Current edition approved April 1,2018.Published June 2018.Originallyapproved in 1965.Last previous edition approved in 2013 as D2420 13.DOI:10.1520/D2420-13R18.2This test method is based on Edwards,J.D.,and McBride,R.S.,“LeadAcetateTest for Hydrogen Sulphide in Gas,”Technologic Papers T41,National Institute forStandards and Technology,Aug.9,1914.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4Available from Gas Processors Association(GPA),66 American Plaza,Suite700,Tulsa,OK 74135,http:/www.gpaglobal.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.5 TubingHigh-pressure connecting tubing to connect th