ASTM_D_341_-_20e1.pdf

Designation:D341201Standard Practice forViscosity-Temperature Equations and Charts for LiquidPetroleum or Hydrocarbon Products1This standard is issued under the fixed designation D341;the number immediately following the designation indicates the year oforiginal adoption or,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.This standard has been approved for use by agencies of the U.S.Department of Defense.1NOTEEditorially removed adjunct information in August 2020.1.Scope*1.1 This practice covers kinematic viscosity-temperatureequations and charts(see Figs.1-3),which are a convenientmeans to ascertain the kinematic viscosity of a petroleum oil orliquid hydrocarbon at any temperature within a limited range,provided that the kinematic viscosities at two temperatures areknown.1.2 The charts are designed to permit petroleum oil kine-matic viscosity-temperature data to plot as a straight line.Thecharts have been derived from the equations shown in Section5.The charts here presented provide a significant improvementin linearity over the charts previously available under MethodD341 03.This increases the reliability of extrapolation tohigher temperatures.1.3 The values provided in SI units are to be regarded asstandard.1.3.1 ExceptionThe values given in parentheses are pro-vided for information only.1.4 This international 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)Committee.2.Referenced Documents2.1 ASTM Standards:2NOTE1Any ASTM standard that measures kinematic viscosity atmultiple temperatures is applicable to D341.Some examples are givenbelow.D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D7042 Test Method for Dynamic Viscosity and Density ofLiquids by Stabinger Viscometer(and the Calculation ofKinematic Viscosity)D7279 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids by Automated Houillon Viscometer3.Method Limitations3.1 WarningThe charts should be used only in that rangein which the hydrocarbon or petroleum fluids are homogeneousliquids.The suggested range is thus between the cloud point atlow temperatures and the initial boiling point at higher tem-peratures.The charts provide improved linearity in both lowkinematic viscosity and at temperatures up to 340 C(approxi-mately 650 F)or higher.Some high-boiling point materialscan show a small deviation from a straight line as low as280 C(approximately 550 F),depending on the individualsample or accuracy of the data.Reliable data can be usefullyplotted in the high temperature region even if it does exhibitsome curvature.Extrapolations into such regions from lowertemperatures will lack accuracy,however.Experimental datataken below the cloud point or temperature of crystal growthwill generally not be of reliable repeatability for interpolationor extrapolation on the charts.It should also be emphasizedthat fluids other than hydrocarbons will usually not plot as astraight line on these charts.3.2 These charts are derived from the equations shown inSection 5 and are applicable over the following ranges:Fig.10.30 cSt to 20 000 000 cSt and 70 C to 370 CFig.21.50 cSt to 200 000 cSt and 40 C to 150 CFig.30.18 cSt to 7.0 cSt and 70 C to 370 C4.Procedure for Use of the Charts4.1 Plot two known kinematic viscosity-temperature pointson the chart.Draw a sharply defined straight line through them.A point on this line,within the range defined in Section 3,1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and are the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved May 1,2020.Published June 2020.Originallyapproved in 1932.Last previous edition approved in 2017 as D341 17.DOI:10.1520/D0341-20E01.2For 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 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.FIG.1 Facsimile of Kinematic Viscosity-Temperature Chart I High Range(Temperature in degrees Celsius)D341 2012F