1、Designation:D794521aStandard Test Method forDetermination of Dynamic Viscosity and Derived KinematicViscosity of Liquids by Constant Pressure Viscometer1This standard is issued under the fixed designation D7945;the number immediately following the designation indicates the year oforiginal adoption o
2、r,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.1.Scope*1.1 This test method covers the measurement of dynamicviscosity and density for the purp
3、ose of derivation of kinematicviscosity of petroleum liquids,both transparent and opaque.The kinematic viscosity,in this test method is derived bydividing the dynamic viscosity,by the density,obtained atthe same test temperature.This test method also calculates thetemperature at which petroleum liqu
4、ids attain a specifiedkinematic viscosity using Practice D341.1.2 The result obtained from this test method is dependentupon the behavior of the sample and is intended for applicationto liquids for which primarily the shear stress and shear rate areproportional(Newtonian flow behavior).1.3 The range
5、 of kinematic viscosity covered by this testmethod is from 0.5 mm2/s to 1000 mm2/s in the temperaturerange between 40 C to 120 C;however the precision hasbeen determined only for fuels and oils in the range of2.06 mm2/s to 476 mm2/s at 40 C and 1.09 mm2/sto107 mm2/s at 100 C(as stated in Section 12
6、on Precision andBias).For jet fuels,the precision of kinematic viscosity hasbeen determined in the range of 2.957 mm2/s to 5.805 mm2/s at20 C and 5.505 mm2/s to 13.03 mm2/s at 40 C(as stated inSection 12 on Precision and Bias),and the precision of thetemperature at 12 mm2/s(cSt)has been determined i
7、n therange of 38.3 C to 58.1 C(as stated in Section 13 onPrecision and Bias).The precision has only been determinedfor those materials,viscosity ranges,and temperatures asindicated in Section 12 on Precision and Bias.The test methodcan be applied to a wider range of materials,viscosity,andtemperatur
8、e.For materials not listed in Section 12 on Precisionand Bias,the precision and bias may not be applicable.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concern
9、s,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.1.6 This international standard was developed in accor-dance with internat
10、ionally 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 Standards:2D341 Practic
11、e for Viscosity-Temperature Equations andCharts for Liquid Petroleum or Hydrocarbon ProductsD445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D1655 Specification for Aviation Turbine FuelsD2162 Practice for Basic Calibration of Master Vis
12、cometersand Viscosity Oil StandardsD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products,Liquid Fuels,and LubricantsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the S
13、ame Property of a MaterialD7566 Specification for Aviation Turbine Fuel ContainingSynthesized Hydrocarbons2.2 ISO Standards:3ISO 5725 Accuracy(Trueness and Precision)of Measure-ment Methods and ResultsISO/IEC 17025 General Requirements for the Competenceof Testing and Calibration Laboratories1This t
14、est method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved Dec.1,2021.Published January 2022.Originallypublished in 2014.Last previous edition approved
15、in 2021 as D7945 21.DOI:10.1520/D7945-21A.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.3Available from American
16、 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 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 Recommendatio
