ASTM_D_8094_-_21.pdf

Designation:D809421Standard Test Method forDetermination of Water Content of Liquefied PetroleumGases(LPG)Using an Online Electronic Moisture Analyzer1This standard is issued under the fixed designation D8094;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.Scope*1.1 This test method covers the quantitative determinationof water in liquefied petroleum gases(LPG)from 1 mg kg to250 mgkg using an online electronic moisture analyzer,alsoknown as an electronic hygrometer or dew point analyzer,inthe absence of methanol or other anti-freeze agent.1.1.1 These analyzers commonly use sensing cells based onaluminum oxide,Al2O3,silicone,phosphorus pentoxide,P2O5,piezoelectric-type cells,or laser-based technologies to measurethe dew point temperature of LPG.1.1.2 Knowledge of the hydrocarbon composition of theLPG is required to calculate the water content on a mass basisfrom the dew point temperature of an LPG sample.1.1.3 The LPG shall be free of alcohol(sometimes added asan anti-freeze agent)as it can interfere with the electronicmoisture analyzer.Thus the method will be most useful in aprocess facility where it is known that no methanol has beenadded to the LPG product.1.2 The values stated in SI units are to be regarded asstandard.1.2.1 There is an exception in Appendix X1,where the unit“mbar”is used in data provided by an external source,andparts per million by weight(ppm by weight)is widely used inindustry.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:2D1142 Test Method for Water Vapor Content of GaseousFuels by Measurement of Dew-Point TemperatureD1145 Test Method for Sampling Natural Gas(Withdrawn1986)3D1835 Specification for Liquefied Petroleum(LP)GasesD2163 Test Method for Determination of Hydrocarbons inLiquefied Petroleum(LP)Gases and Propane/PropeneMixtures by Gas ChromatographyD2421 Practice for Interconversion of Analysis of C5andLighter Hydrocarbons to Gas-Volume,Liquid-Volume,orMass BasisD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6624 Practice for Determining a Flow-Proportioned Aver-age Property Value(FPAPV)for a Collected Batch ofProcess Stream Material Using Stream Analyzer DataD6849 Practice for Storage and Use of Liquefied PetroleumGases(LPG)in Sample Cylinders for LPG Test MethodsD7453 Practice for Sampling of Petroleum Products forAnalysis by Process Stream Analyzers and for ProcessStream Analyzer System ValidationD7808 Practice for Determining the Site Precision of aProcess Stream Analyzer on Process Stream Material3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 capacitance-type cell,na sensor that can store elec-tric charge which changes with the partial pressure of watervapor in the system.3.1.1.1 DiscussionAn example of capacitance-type celluses aluminum coated with Al2O3as part of a capacitor.Thedielectric Al2O3film changes the capacity of the capacitor inrelation to the water vapor present.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 1,2021.Published July 2021.Originally approvedin 2020.Last previous edition approved in 2020 as D8094 20.DOI:10.1520/D8094-21.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright 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.13.1.1