1、Designation:D715211Standard Practice forCalculating Viscosity of a Blend of Petroleum Products1This standard is issued under the fixed designation D7152;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er 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 covers the procedures for calculating theestimated kinematic viscosity of a blend of two or morepetroleum products,such as lubri
3、cating oil base stocks,fuelcomponents,residua with kerosine,crude oils,and relatedproducts,from their kinematic viscosities and blend fractions.1.2 This practice allows for the estimation of the fraction ofeach of two petroleum products needed to prepare a blendmeeting a specific viscosity.1.3 This
4、practice may not be applicable to other types ofproducts,or to materials which exhibit strong non-Newtonianproperties,such as viscosity index improvers,additivepackages,and products containing particulates.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement
5、are included in thisstandard.1.5 Logarithms may be either common logarithms or naturallogarithms,as long as the same are used consistently.Thispractice uses common logarithms.If natural logarithms areused,the inverse function,exp(),must be used in place of thebase 10 exponential function,10,used her
6、ein.1.6 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 to determine theapplicability of regulatory limitations prior to use.2.Referenced
7、Documents2.1 ASTM Standards:2D341 Practice for Viscosity-Temperature Charts for LiquidPetroleum ProductsD445 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 Viscomete
8、r(and the Calculation ofKinematic Viscosity)2.2 ASTM Adjuncts:Calculating the Viscosity of a Blend of Petroleum ProductsExcel Worksheet33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 ASTM Blending Method,na blending method atconstant temperature,using components in volume perc
9、ent.3.1.2 blend fraction,nthe ratio of the amount of a com-ponent to the total amount of the blend.Blend fraction may beexpressed as mass percent or volume percent.3.1.3 blending method,nan equation for calculating theviscosity of a blend of components from the known viscositiesof the components.3.1
10、.4 dumbbell blend,na blend made from components ofwidely differing viscosity.3.1.4.1 Examplea blend of S100N and Bright Stock.3.1.5 inverse blending method,nan equation for calculat-ing the predicted blending fractions of components to achievea blend of given viscosity.3.1.6 mass blend fraction,nThe
11、 ratio of the mass of acomponent to the total mass of the blend.3.1.7 McCoull-Walther-Wright Function,na mathematicaltransformation of viscosity,generally equal to the logarithm ofthe logarithm of kinematic viscosity plus a constant,lo-glog(v+0.7).For viscosities below 2 mm2/s,additional termsare ad
12、ded to improve accuracy.3.1.8 modified ASTM Blending Method,na blendingmethod at constant temperature,using components in masspercent.3.1.9 modified Wright Blending Method,na blendingmethod at constant viscosity,using components in masspercent.1This practice is under the jurisdiction of ASTM Committ
13、ee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.07 on Flow Properties.Current edition approved Jan.1,2011.Published March 2011.Originallyapproved in 2005.Last previous edition approved in 2005 as D7152051.DOI:10.1520/D7152-11.2For referen
14、ced 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 ASTM International Headquarters.Order Adjunct No.ADJD7152.Orig
15、inal adjunct produced in 2006.*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 3.1.10 volume blend fraction,nThe ratio of the volume ofa component to the total volume of the
16、blend.3.1.11 Wright Blending Method,na blending method atconstant viscosity,using components in volume percent.3.2 Symbols:fij=blending fraction of component i calculated at tem-perature tj.Blending fraction may be in mass percentor volume percent.mi=slope of the viscosity-temperature line,Wi12 Wi0!Ti12 Ti0!mi-1=reciprocal of the viscosity-temperature slope,mitB=temperature,in Celsius,at which the blend hasviscosity vBtij=temperature,in Celsius,at which component i hasviscosity vijTij=transforme
