ASTM_D_2161_-_10.pdf

Designation:D216110Standard Practice forConversion of Kinematic Viscosity to Saybolt UniversalViscosity or to Saybolt Furol Viscosity1This standard is issued under the fixed designation D2161;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 Department of Defense.1.Scope*1.1 This practice2covers the conversion tables and equa-tions for converting kinematic viscosity in mm2/s at anytemperature to Saybolt Universal viscosity in Saybolt Univer-sal seconds(SUS)at the same temperature and for convertingkinematic viscosity in mm2/s at 122 and 210F(50 and 98.9C)to Saybolt Furol viscosity in Saybolt Furol seconds(SFS)at thesame temperatures.Kinematic viscosity values are based onwater being 1.0034 mm2/s(cSt)at 68F(20C).NOTE1Afundamental and preferred method for measuring kinematicviscosity is by use of kinematic viscometers as outlined in Test MethodD445.It is recommended that kinematic viscosity be reported in millime-tres squared per second,instead of Saybolt Universal Seconds(SUS)orSaybolt Furol Seconds(SFS).This method is being retained for thepurpose of calculation of kinematic viscosities from SUS and SFS datathat appear in past literature.One millimetre squared per second(mm2/s)equals one centistoke(cSt),which is another unit commonly found inolder literature.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forreference information purposes only.The SI unit of kinematicviscosity is mm2/s.1.2.1 ExceptionFahrenheit temperature units are used inthis practice because they are accepted by industry for the typeof legacy conversions described in this practice.1.3 This 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 ASTM Standards:3D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D2270 Practice for Calculating Viscosity Index from Kine-matic Viscosity at 40 and 100C2.2 ASTM Adjunct:4ADJD2161 Viscosity Extrapolation Tables to Zero DegreesFahrenheit(SSU)3.Summary of Practice3.1 The Saybolt Universal viscosity equivalent to a givenkinematic viscosity varies with the temperature at which thedetermination is made.The basic conversion values are thosegiven in Table 1 for 100F.The Saybolt Universal viscosityequivalent to a given kinematic viscosity at any temperaturemay be calculated as described in 4.3.Equivalent values at210F are given in Table 1 for convenience.3.2 The Saybolt Furol viscosity equivalents are tabulated inTable 3 for temperatures of 122F and 210F only.3.3 Examples for using the tables are given in Appendix X1.4.Significance and Use4.1 At one time the petroleum industry relied on measuringkinematic viscosity by means of the Saybolt viscometer,andexpressing kinematic viscosity in units of Saybolt UniversalSeconds(SUS)and Saybolt Furol Seconds(SFS).This practiceis now obsolete in the petroleum industry.4.2This practice establishes the official equations relatingSUS and SFS to the SI kinematic viscosity units,mm2/s.1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts and Lubricants and is the direct responsibility of Subcommittee D02.07 onFlow Properties.Current edition approved Oct.1,2010.Published November 2010.Originallyapproved in 1963,replacing former D446 and D666.Last previous edition approvedin 2005 as D2161051.DOI:10.1520/D2161-10.2This practice,together with Practice D2270,replaces Compilation of ASTMViscosity Tables for Kinematic Viscosity Conversions.3For 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.4Available from ASTM International Headquarters.Order Adjunct No.ADJD2161.Original adjunct produced in 1998.*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 States1 4.3 This practice allows for the conversion between SUSand SFS units and SI units of kinematic viscosity.5.Procedure for Conversion to Saybolt UniversalViscosity5.1 Convert kinematic viscosities between 1.81 and 500mm2/s(cSt)at 100F,and between 1.77 and 139.8 mm2/s(cSt)at 210F,to equivalent Saybolt Universal seconds directly fromTable 1(see Appendix X1,Example 1).NOTE2Obtain viscosities not listed,but which are within the rangegiven in Table 1,by