ASTM_D_3701_-_17.pdf

Designation:D370117Standard Test Method forHydrogen Content of Aviation Turbine Fuels by LowResolution Nuclear Magnetic Resonance Spectrometry1This standard is issued under the fixed designation D3701;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the determination of the hydro-gen content of aviation turbine fuels.1.2 Use Test Methods D4808 or D7171 for the determina-tion of hydrogen in other petroleum liquids.1.3 The values stated in SI units are to be regarded asstandard.The preferred units are mass percent hydrogen.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 and health practices and determine the applica-bility of regulatory limitations prior to use.For a specificwarning statement,see 6.1.1.5 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 Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1322 Test Method for Smoke Point of Kerosine andAviation Turbine FuelD1740 Test Method for Luminometer Numbers of AviationTurbine Fuels(Withdrawn 2006)3D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4808 Test Methods for Hydrogen Content of LightDistillates,Middle Distillates,Gas Oils,and Residua byLow-Resolution Nuclear Magnetic Resonance Spectros-copyD7171 Test Method for Hydrogen Content of Middle Dis-tillate Petroleum Products by Low-Resolution PulsedNuclear Magnetic Resonance Spectroscopy3.Summary of Test Method3.1 A sample of the material is compared in a continuouswave,low-resolution,nuclear magnetic resonance spectrom-eter with a reference standard sample of a pure hydrocarbon.The results from the integrator on the instrument are used as ameans of comparing the theoretical hydrogen content of thestandard with that of the sample,the result being expressed asthe hydrogen content(percent mass basis)in the sample.4.Significance and Use4.1 The combustion quality of aviation turbine fuel hastraditionally been controlled in specifications by such tests assmoke point(see Test Method D1322),smoke volatility index,aromatic content of luminometer number(see Test MethodD1740).Evidence is accumulating that a better control of thequality may be obtained by limiting the minimum hydrogencontent of the fuel.4.2 Existing methods allow the hydrogen content to becalculated from other parameters or determined by combustion1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.03 on Elemental Analysis.Current edition approved June 1,2017.Published June 2017.Originallyapproved in 1978.Last previous edition approved in 2012 as D3701 01(2012).DOI:10.1520/D3701-17.2For 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.1 techniques.The method specified provides a quick,simple,andmore precise alternative to these methods.5.Apparatus5.1 Nuclear Magnetic Resonance Spectrometer4A low-resolution continuous-wave instrument capable of measuring anuclear magnetic resonance of hydrogen atoms,and fitted with:5.1.1 Excitation and Detection Coil,of suitable dimensionsto contain the test cell.5.1.2 Electronic Unit,to control and monitor the magnet andcoil and containing:5.1.2.1 Circuits,to control and adjust the radio frequencylevel and audio frequency gain.5.1.2.2 Integrating Counter,with variable time period inseconds.5.2 Conditioning BlockA block of aluminum alloy drilledwith holes of sufficient size to accommodate the test cells withthe mean height of the sample being at least 20 mm below thetop of the conditioning block