1、Designation:D288513Standard Test Method forDetermination of Octane Number of Spark-Ignition EngineFuels by On-Line Direct Comparison Technique1This standard is issued under the fixed designation D2885;the number immediately following the designation indicates the year oforiginal adoption or,in the c
2、ase 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
3、 method covers the quantitative online determi-nation by direct comparison of the difference in knock rating ordelta octane number of a stream sample of spark-ignitionengine fuel from that of a comparison reference fuel.1.2 This test method covers the methodology for obtainingan octane number using
4、the measured delta octane number andthe octane number of the comparison reference fuel.1.3 The comparison reference fuel is required to be ofessentially the same composition as the stream sample to beanalyzed and can be a secondary fuel termed standard fuel ora tertiary fuel termed prototype fuel.1.
5、4 The test method utilizes a knock testing unit/automatedanalyzer system that incorporates computer control of a stan-dardized single-cylinder,four-stroke cycle,variable compres-sion ratio,carbureted,CFR engine with appropriate auxiliaryequipment using either Test Method D2699 Research methodor Test
6、 Method D2700 Motor method operating conditions.1.4.1 Knock measurements are based on operation of bothfuels at the specific fuel-air ratio that produces maximumknock intensity for that fuel.1.4.2 Measured differences in knock intensity are scaled toprovide a positive or negative delta octane number
7、 of thestream sample from the comparison reference fuel when thefuels are compared at the same compression ratio.1.4.3 Measured differences in compression ratio are scaledto provide a positive or negative delta octane number of thestream sample from the comparison reference fuel when thefuels are co
8、mpared at the same knock intensity.1.5 This test method is limited to testing 78 to 102 octanenumber spark-ignition engine fuels using either research ormotor method conditions.1.6 The octane number difference between the streamsample and the applicable comparison reference fuel is self-limiting by
9、specifications imposed upon the standard andprototype fuels.1.7 Specifications for selection,preparation,storage,anddispensing of standard and prototype fuels are provided.Detailed procedures for determination of an appropriate as-signed octane number for both standard and prototype fuels arealso in
10、corporated.1.8 The values of operating conditions are stated in SI unitsand are considered standard.The values in parentheses arehistorical inch-pound units.The standardized CFR enginemeasurements continue to be expressed in inch-pound unitsonly because of the extensive and expensive tooling that ha
11、sbeen created for this equipment.1.9 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 limitation
12、s prior to use.For more specificwarning statements,see Section 8 and Annex A1.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD2699 Test Method for Research Octane Number of Spark-Ignition Engine FuelD2700 Test Method for Motor Octane Number of Spark-Ignition Engine Fu
13、elD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum Products1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Product
14、s and Lubricants and is the direct responsibility of SubcommitteeD02.01 on Combustion Characteristics.Current edition approved June 15,2013.Published July 2013.Originallyapproved in 1970.Last previous edition approved in 2010 as D2885 10a.DOI:10.1520/D2885-13.2For referenced ASTM standards,visit the
15、 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 Har
16、bor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 D4814 Specification for Automotive Spark-Ignition EngineFuelD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD5842 Practice for Sampling and Handling of Fuels forVolatility MeasurementD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6624 Practice for Determining a Flo
