ASTM_D_7800_-_D_7800M_-_14.pdf

Designation:D7800/D7800M14Standard Test Method forDetermination of Elemental Sulfur in Natural Gas1This standard is issued under the fixed designation D7800/D7800M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is primarily for the determination ofelemental sulfur in natural gas pipelines,but it may be appliedto other gaseous fuel pipelines and applications provided theuser has validated its suitability for use.The detection range forelemental sulfur,reported as sulfur,is 0.0018 to 30 mg/L.Theresults may also be reported in units of mg/kg or ppm.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1072 Test Method for Total Sulfur in Fuel Gases byCombustion and Barium Chloride TitrationD1145 Test Method for Sampling Natural Gas(Withdrawn1986)3D1945 Test Method for Analysis of Natural Gas by GasChromatographyD3609 Practice for Calibration Techniques Using Perme-ation TubesD4084 Test Method for Analysis of Hydrogen Sulfide inGaseous Fuels(Lead Acetate Reaction Rate Method)D4150 Terminology Relating to Gaseous FuelsD4468 Test Method for Total Sulfur in Gaseous Fuels byHydrogenolysis and Rateometric ColorimetryD4626 Practice for Calculation of Gas ChromatographicResponse FactorsD5287 Practice for Automatic Sampling of Gaseous FuelsD5504 Test Method for Determination of Sulfur Compoundsin Natural Gas and Gaseous Fuels by Gas Chromatogra-phy and ChemiluminescenceD6228 Test Method for Determination of Sulfur Compoundsin Natural Gas and Gaseous Fuels by Gas Chromatogra-phy and Flame Photometric DetectionD7165 Practice for Gas Chromatograph Based On-line/At-line Analysis for Sulfur Content of Gaseous FuelsD7166 Practice for Total Sulfur Analyzer Based On-line/At-line for Sulfur Content of Gaseous FuelsD7551 Test Method for Determination of Total VolatileSulfur in Gaseous Hydrocarbons and Liquefied PetroleumGases and Natural Gas by Ultraviolet FluorescenceD7607 Test Method for Analysis of Oxygen in GaseousFuels(Electrochemical Sensor Method)E840 Practice for Using Flame Photometric Detectors in GasChromatography2.2 ISO DocumentsISO 14532 Natural GasVocabulary3.Terminology3.1 Definitions:3.1.1 compressed natural gas(CNG),nnatural gas that istypically pressurized to 24.8 MPa 3,600 psi.CNG is primar-ily used as a vehicular fuel.D4150-08 with modifications3.1.2 elemental sulfur,na pale yellow nonmetallic ele-ment occurring in nature and found as a particulate in dieselexhaust,natural gas,and other gaseous fuels.It exists inseveral free and combined allotropic forms.3.1.3 episulfide,na class of compound that contains asaturated heterocyclic ring consisting of two carbon atoms andone sulfur atom.It is the sulfur analogue of an epoxide.Theyare also known as thiiranes,olefin sulfides,thioalkyleneoxides,and thiacyclopropanes.3.1.4 liquefied natural gas(LNG),nnatural gas that hasbeen liquefied,after processing,for storage or transportationpurposes.ISO 145321This test method is under the jurisdiction ofASTM Committee D03 on GaseousFuels and is the direct responsibility of Subcommittee D03.05 on Determination ofSpecial Constituents of Gaseous Fuels.Current edition approved Nov.1,2014.Published November 2014.DOI:10.1520/D7800_D7800M-142For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5 natural gas,na naturally occurring mixture of hy-drocarbon and nonhydrocarbon gases found in porous geologi-cal formations(reservoirs)beneath the earths surface,often inassociation with petroleum.The principal constituent of naturalgas is methane.D4150-083.1.6 natural gas pipeline,npipeline in which natural gasis transported.3.1.7 pipeline,nall parts of those physical facilitiesthrough which gas moves in transportation,including pipe,valves,and other appurtenance attached to pipe,compressorunits,metering stations,regulator stations,del