1、Designation:D768818Standard Test Method forEvaluating Lubricity of Diesel Fuels by the High-FrequencyReciprocating Rig(HFRR)by Visual Observation1This standard is issued under the fixed designation D7688;the number immediately following the designation indicates the year oforiginal adoption or,in th
2、e 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 test method covers the evaluation of the lubricity ofdiesel fuels using a high-frequen
3、cy reciprocating rig(HFRR).1.2 This test method is applicable to middle distillate fuels,such as Grades No.1-D S15,S500,and S5000,and Grades No.2-D S15,S500,and S5000 diesel fuels,in accordance withSpecification D975;and other similar petroleum-based fuelswhich can be used in diesel engines.This tes
4、t method also isapplicable to biodiesel blends.B5 was included in the roundrobin program that determined the precision statement.NOTE1It is not known that this test method will predict theperformance of all additive/fuel combinations.Additional work is under-way to establish this correlation and fut
5、ure revisions of this test methodmay be necessary once this work is complete.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 u
6、se.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.Specific warning statements are given in Section 7.1.5 This international standard was developed in acco
7、r-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)Committee.2.Referenced Documents2.1 ASTM St
8、andards:2D975 Specification for Diesel Fuel OilsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4306 Practice for Aviation Fuel Sample Containers forTests Affected by Trace ContaminationD6078 Test Method fo
9、r Evaluating Lubricity of Diesel Fuelsby the Scuffing Load Ball-on-Cylinder Lubricity Evalua-tor(SLBOCLE)E18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE92 Test Methods for Vickers Hardness and Knoop Hard-ness of Metallic Materials2.2 SAE Standard:3SAE-AMS 6440 Steel,Bars,Forgings,and
10、Tubing,1.45 Cr(0.93-1.05C)(SAE 52100),for Bearing Applications2.3 ISO Standard:4ISO 3290 Roller Bearings,Balls Dimensions and toler-ances3.Terminology3.1 Definitions:3.1.1 boundary lubrication,na condition in which thefriction and wear between two surfaces in relative motion aredetermined by the pro
11、perties of the surfaces and the propertiesof the contacting fluid,other than bulk viscosity.3.1.1.1 DiscussionMetal to metal contact occurs and thechemistry of the system is involved.Physically adsorbed or1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid F
12、uels,and Lubricants and is the direct responsibility ofSubcommittee D02.E0 on Burner,Diesel,Non-Aviation Gas Turbine,and MarineFuels.Current edition approved Aug.1,2018.Published September 2018.Originallypublished in 2011.Last previous edition approved in 2016 as D7688 11(2016).DOI:10.1520/D7688-18.
13、This test method was developed by ISO/TC22/SC7/WG6 and is a part of ISO12156.2For 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 AS
14、TM website.3Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standard
15、Copyright 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 Internatio
16、nal Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 chemically reacted soft films(usually very thin)supportcontact loads.As a result,some wear is inevitable.3.1.2lubricity,na qualitative term describing the abilityof a fluid to affect friction between,and wear to,surfaces inrelative motion under load.3.1.2.1 DiscussionIn this test method,the lubricity of afluid is evaluated by the wear scar,in microns,produced on anoscillati
