ASTM_D_613_-_15ae1.pdf

Designation:D61315a1Designation:41/2000Standard Test Method forCetane Number of Diesel Fuel Oil1This standard is issued under the fixed designation D613;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.1NOTEResearch Report information in subsection 15.1.6 was corrected editorially in July 2015.1.Scope*1.1 This test method covers the determination of the ratingof diesel fuel oil in terms of an arbitrary scale of cetanenumbers using a standard single cylinder,four-stroke cycle,variable compression ratio,indirect injected diesel engine.1.2 The cetane number scale covers the range from zero(0)to 100,but typical testing is in the range of 30 to 65 cetanenumber.1.3 The values for operating conditions are stated in SI unitsand are to be regarded as the standard.The values given inparentheses are the historical inch-pound units for informationonly.In addition,the engine measurements continue to be ininch-pound units because of the extensive and expensivetooling that has been created for these units.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 more specificwarning statements,see Annex A1.2.Referenced Documents2.1 ASTM Standards:2D975 Specification for Diesel Fuel OilsD1193 Specification for Reagent WaterD2500 Test Method for Cloud Point of Petroleum ProductsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsE456 Terminology Relating to Quality and StatisticsE542 Practice for Calibration of Laboratory VolumetricApparatusE832 Specification for Laboratory Filter Papers3.Terminology3.1 Definitions:3.1.1 accepted reference value(ARV),na value that servesas an agreed-upon reference for comparison,and which isderived as:(1)a theoretical or established value,based onscientific principles,or(2)an assigned or certified value,basedon experimental work of some national or internationalorganization,or(3)a consensus or certified value,based oncollaborative experimental work under the auspices of ascientific or engineering group.E4563.1.1.1 DiscussionIn the context of this test method,accepted reference value is understood to apply to the cetanenumber of specific reference materials determined empiricallyunder reproducibility conditions by the National ExchangeGroup or another recognized exchange testing organization.3.1.2 cetane number(CN),na measure of the ignitionperformance of a diesel fuel oil obtained by comparing it toreference fuels in a standardized engine test.D41753.1.2.1 DiscussionIn the context of this test method,ignition performance is understood to mean the ignition delayof the fuel as determined in a standard test engine undercontrolled conditions of fuel flow rate,injection timing andcompression ratio.3.1.3 compression ratio(CR),nthe ratio of the volume ofthe combustion chamber including the precombustion chamberwith the piston at bottom dead center to the comparable volumewith the piston at top dead center.3.1.4 ignition delay,nthat period of time,expressed indegrees of crank angle rotation,between the start of fuelinjection and the start of combustion.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.01 on Combustion Characteristics.Current edition approved April 1,2015.Published May 2015.Originallyapproved in 1941.Last previous edition approved in 2015 as D613 15.DOI:10.1520/D0613-15AE01.2For 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.*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 States1 3.1.5 injection timing(injection advance),nthat time inthe combustion cycle,measured in degrees of crank angle,atwhich fuel injection into the combustion chamber is initiated.3.1.6 repeatability conditions,nconditions where inde-pendent test results are obtained with the same method onidentical test items in the same laboratory by the same operatorusing the same equipment within short intervals of time.E4563.1.6.1 DiscussionIn the context of this test method,ashort time interval between two ra