1、Designation:D731421Standard Practice forDetermination of the Heating Value of Gaseous Fuels usingCalorimetry and On-line/At-line Sampling1This standard is issued under the fixed designation D7314;the number immediately following the designation indicates the year oforiginal adoption or,in the case o
2、f 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 practice is for the determination of the heatingvalue measurement of gaseous fuels using a calo
3、rimeter.Heating value determination of sample gasses containing watervapor will require vapor phase moisture measurements of thepre-combustion sample gas as well as the non-condensedgasses exiting the calorimeter.Instruments equipped withappropriate conditioners and algorithms may provide heatingval
4、ue results on a net or gross and dry or wet basis.1.2 This practice is applicable to at-line and in-line instru-ments that are operated from time to time on a continuousbasis.1.3 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstanda
5、rd.1.4 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
6、.5 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 T
7、rade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1070 Test Methods for Relative Density of Gaseous FuelsD1826 Test Method for Calorific(Heating)Value of Gases inNatural Gas Range by Continuous Recording CalorimeterD3588 Practice for Calculating Heat Value,CompressibilityFactor,and Relat
8、ive Density of Gaseous FuelsD3764 Practice for Validation of the Performance of ProcessStream Analyzer SystemsD4150 Terminology Relating to Gaseous FuelsD4891 Test Method for Heating Value of Gases in NaturalGas and Flare Gases Range by Stoichiometric Combus-tionD5287 Practice for Automatic Sampling
9、 of Gaseous FuelsD5503 Practice for Natural Gas Sample-Handling and Con-ditioning Systems for Pipeline Instrumentation(With-drawn 2017)3D6122 Practice for Validation of the Performance of Multi-variate Online,At-Line,Field and Laboratory InfraredSpectrophotometer,and Raman Spectrometer Based Ana-lyz
10、er SystemsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6621 Practice for Performance Testing of Process Analyz-ers for Aromatic Hydrocarbon MaterialsD7164 Practice for On-line/At-line Heating Value Deter
11、mi-nation of Gaseous Fuels by Gas Chromatography2.2 ISO Standards:4ISO 14532 Natural GasVocabularyISO 7504 Gas AnalysisVocabulary3.Terminology3.1 Refer to Terminology D4150 for general definitionsrelated to gaseous fuels.Definitions specific to this standardfollow.3.2 Definitions of Terms Specific t
12、o This Standard:3.2.1 auto-verification,nan automated means of introduc-ing calibration gas mixtures or reference gas mixtures into ananalyzer for the purposes of verifying the analyzer responsewithout making any adjustments to the calibration parametersof the analyzer.1This practice is under the ju
13、risdiction of ASTM Committee D03 on GaseousFuels and is the direct responsibility of Subcommittee D03.12 on On-Line/At-LineAnalysis of Gaseous Fuels.Current edition approved April 1,2021.Published May 2021.Originallyapproved in 2008.Last previous edition approved in 2015 as D7314 10(2015).DOI:10.152
14、0/D7314-21.2For 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
15、is referenced onwww.astm.org.4Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.ch.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis inter
16、national 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.13.2.2 bypass line,nline ultimately vented to the atmo-sphere that is used where it is impractical to provide a sufficientpressure differential.3.2.2.1 DiscussionFlowrateThe flowrate and pressurel