1、Designation:D779421Standard Practice forBlending Mid-Level Ethanol Fuel Blends for Flexible-FuelVehicles with Automotive Spark-Ignition Engines1This standard is issued under the fixed designation D7794;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、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.Scope*1.1 This practice applies to the blending of automotivespark-ignition engine fuels with ethanol c
3、oncentrations greaterthan those suitable for conventional-fuel vehicles and less thanthe minimum ethanol content specification limits of Specifica-tion D5798.These mid-level ethanol fuel blends are for use inflexible-fuel vehicles and are sometimes referred to at retail as“Ethanol Flex Fuel.”1.2 The
4、se mid-level ethanol fuel blends are only suitable foruse in ground flexible-fuel vehicles equipped with spark-ignition engines.Flexible-fuel vehicles are designed to operateon gasoline or gasoline-ethanol blends that meet the require-ments of Specification D4814,ethanol fuel blends that meet thereq
5、uirements of Specification D5798,or any combination ofthese.In the United States,these vehicles are certified by theU.S.EPA as emissions compliant with these types of fuels.1.3 The mid-level ethanol fuel blend shall be blended fromeither:1.3.1 Denatured fuel ethanol conforming to the require-ments o
6、f Specification D4806 with a reduced limit on inorganicchloride content that will ensure no more than 1 mg/kginorganic chloride in the finished fuel and from spark-ignitionengine fuel conforming to Specification D4814(often at adistribution terminal or bulk plant),or1.3.2 Ethanol fuel blends conform
7、ing to SpecificationD5798 and from spark-ignition engine fuel conforming toSpecification D4814(often at a retail site).1.4 This practice describes the required procedures forblending various mid-level ethanol fuel blends for flexible-fuelvehicles at the bulk distribution point or retail/commercialde
8、livery site.These requirements may be applied at otherpoints in the production and distribution system when providedby agreement between the purchaser and the supplier.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This
9、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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This inte
10、rnational 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)Com
11、mittee.2.Referenced Documents2.1 ASTM Standards:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4806 Specification for Denatured F
12、uel Ethanol for Blend-ing with Gasolines for Use as Automotive Spark-IgnitionEngine FuelD4814 Specification for Automotive Spark-Ignition EngineFuelD4815 Test Method for Determination of MTBE,ETBE,TAME,DIPE,tertiary-Amyl Alcohol and C1to C4Alco-hols in Gasoline by Gas ChromatographyD5191 Test Method
13、 for Vapor Pressure of Petroleum Prod-ucts and Liquid Fuels(Mini Method)D5501 Test Method for Determination of Ethanol andMethanol Content in Fuels Containing Greater than 20%Ethanol by Gas ChromatographyD5599 Test Method for Determination of Oxygenates in1This practice is under the jurisdiction of
14、ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.A0.02 on Oxygenated Fuels and Components.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 2012.Last previous edition approved in 2020 as D7794 20.
15、DOI:10.1520/D7794-21.2For 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
16、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.1Gasoline by Gas Chromatography and Oxygen SelectiveFlame
