1、Designation:D779414Standard 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 A
10、STM Standards:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4806 Specification for Denatured Fuel Ethanol for Blend-ing with Gasoli
11、nes 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 for Vapor Pressure of Petroleum Prod
12、-ucts(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 inGasoline by Gas Chromatography and Oxygen SelectiveFlame Ionization DetectionD5798 Specification f
13、or Ethanol Fuel Blends for Flexible-Fuel Automotive Spark-Ignition EnginesD5842 Practice for Sampling and Handling of Fuels forVolatility Measurement1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Sub
14、com-mittee D02.A0.02 on Oxygenated Fuels and Components.Current edition approved Dec.1,2014.Published January 2015.Originallyapproved in 2012.Last previous edition approved in 2012 as D7794 12.DOI:10.1520/D7794-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cust
15、omer 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 194
16、28-2959.United States1 D5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsD6469 Guide for Microbial Contamination in Fuels and FuelSystemsD7319 Test Method for Determination of Existent and Po-tential Sulfate and Inorganic Chloride in Fuel Ethanol andButanol by Direct Injection Suppressed Ion Chromatog-raphyD7328 Test Method for Determination of Existent and Po-tential Inorganic Sulfate and Total Inorganic Chloride inFuel Ethanol by Ion Chromatography Usin
