ASTM_D_7634_-_10.pdf

Designation:D763410Standard Test Method forVisualizing Particulate Sizes and Morphology of ParticlesContained in Hydrogen Fuel by Microscopy1This standard is issued under the fixed designation D7634;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 is primarily intended for visualizingand measuring the sizes and morphology of particulates inhydrogen used as a fuel for fuel cell or internal combustionengine powered vehicles.This test method describes proce-dures required to obtain size and morphology data of knownquality.This test method can be applied to other gaseoussamples requiring determination of particulate sizes and mor-phology provided the users data quality objectives are satis-fied.1.2 Mention of trade names in standard does not constituteendorsement or recommendation.Other manufacturers ofequipment,software or equipment models can be used.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.2.Referenced Documents2.1 ASTM Standards:2D7650 Test Method for Test Method for Sampling of Par-ticulate Matter in High Pressure Hydrogen used as aGaseous Fuel with an In-Stream Filter2.2 SAE Standards:3SAE TIR J2719 Hydrogen Quality Guideline for Fuel CellVehicles,April 2008SAE J6000 Compressed Hydrogen Surface Vehicle Refuel-ing Connection Devices3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 constituentcomponent(or compound)found withina hydrogen fuel mixture3.1.2 contaminantimpurity that adversely affects the com-ponents within the fuel cell system or the hydrogen storagesystem3.1.3 fuel cell grade hydrogenhydrogen satisfying thespecifications in SAE TIR J2719.3.1.4 gaseous fuelmaterial to be tested,as sampled,with-out change of composition by drying or otherwise.3.1.5 HEPA FilterA high efficiency particulate air filterwhich,by definition,removes at least 99.97%of airborneparticles 0.3m in diameter.3.1.6 SAE TIR J2719Information Report on the develop-ment of a hydrogen quality guideline for fuel cell vehicles3.2 Acronyms:3.2.1 FCVFuel Cell Vehicle3.2.2 PSAParticulate sampling adapter for sampling par-ticulate in hydrogen fuel3.2.3 HQSAHydrogen quality sampling adapter for sam-pling gaseous hydrogen fuel3.2.4 SAESociety of Automotive Engineers International3.2.5 PEMPolymer Electrolyte Membrane,also calledProton Exchange Membrane3.2.6 PEMFCproton exchange membrane fuel cells4.Summary of Test Method4.1 This procedure is for visualizing and measuring,bymicroscopy,the sizes and morphology of particulates aftercollection of particulates contained within hydrogen fuel atfueling station dispenser nozzles(Test Method D7650,SAEJ2600)or other gaseous fuel delivery system dispenser inter-faces.Every precaution should be taken to avoid contaminationof particulates onto the filter coming from the PSA,theanalytical system,ambient air,filter handling or other environ-mental sources.1This test method is under the jurisdiction ofASTM Committee D03 on GaseousFuels and is the direct responsibility of Subcommittee D03.14 on Hydrogen andFuel Cells.Current edition approved Dec.1,2010.Published February 2011.DOI:10.1520/D763410.2For 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 SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 Low temperature fuel cells such as proton exchangemembrane fuel cells(PEMFCs)require high purity hydrogenfor maximum material performance and lifetime.The particu-lates in hydrogen used in FCVs and hydrogen powered internalcombustion vehicles may adversely affect pneumatic controlcomponents,such as valves or other critical system compo-nents.The visualization of the size and morphology of particlesis an important tool for determining particle origin as well asfor devising particle formation reduction strategies.6.Interferences6.1 Particulate matter originating in the environment orequipment will interfere with the determinations.Every pre-caution should be taken to avoid contamination of particulatesonto the filter coming from the analytical system,ambient air,filter handling,or other environmental sources.6.