ASTM_D_7995_-_19.pdf

Designation:D799519Standard Test Method forTotal Water in Liquid Butane by Liquefied Gas Sampler andCoulometric Karl Fischer Titration1This standard is issued under the fixed designation D7995;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 method describes the use of a specializedliquefied gas sampler coupled to a coulometric Karl Fischer(KF)titrator for the determination of water in liquid butanewith water concentrations from 1 mg kg to 100 mg kg.NOTE1Other liquefied petroleum gases described in SpecificationD1835 including propane,propene(propylene),butylenes and mixtures ofthese materials and other light hydrocarbons,and dimethyl ether describedin Specification D7901,can be analyzed by this method but the precisionhas not been studied and therefore the stated precision has not beenvalidated for these materials.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.See Section 10 for specific warning statements.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:2D1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1835 Specification for Liquefied Petroleum(LP)GasesD2713 Test Method for Dryness of Propane(Valve FreezeMethod)D3700 Practice for Obtaining LPG Samples Using a Float-ing Piston CylinderD5623 Test Method for Sulfur Compounds in Light Petro-leum Liquids by Gas Chromatography and Sulfur Selec-tive DetectionD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6304 Test Method for Determination of Water in Petro-leum Products,Lubricating Oils,and Additives by Cou-lometric Karl Fischer TitrationD7901 Specification for Dimethyl Ether for Fuel PurposesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE203 Test Method for Water Using Volumetric Karl FischerTitration2.2 Occupational Safety and Health Administration Docu-ment:OSHA Regulations29 CFR paragraphs 1910.1000 and1910.120032.3 Other Standards:UOP 163 Hydrogen Sulfide and Mercaptan Sulfur in LiquidHydrocarbons by Potentiometric Titration43.Terminology3.1 Definitions:3.1.1 liquefied petroleum gas,(LP Gas,LPG),na narrowboiling range mixture of hydrocarbons consisting of propane,propylene,butanes and butylenes,individually or in specifiedcombinations,with limited amounts of other hydrocarbons andnaturally occurring non-hydrocarbons.3.1.2 dimethyl ether(DME),nthe chemical compoundCH3OCH3.3.2 Definitions of Terms Specific to This Standard: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 July 15,2019.Published August 2019.DOI:10.1520/D7995-19.2For 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.3Available from U.S.Government Printing Office,Superintendent ofDocuments,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.access.gpo.gov.4Available from https:/www.astm.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 3.2.1 coulometric Karl Fischer titration(coulometrictitration),nin reference to Karl Fischer titration methods,aprocess of measuring the water content of a sample using anelectrolytic process to generate iodine in situ.3.2.2 mass flow meter,na device used to measure the flowof gases.3.3 Abbreviations:3.3.