ASTM_D_2638_-_10_2015e1.pdf

Designation:D263810(Reapproved 2015)1Standard Test Method forReal Density of Calcined Petroleum Coke by HeliumPycnometer1This standard is issued under the fixed designation D2638;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.1NOTEEditorial changes were made throughout in December 2015.1.Scope1.1 This test method covers the determination of the realdensity(RD)of calcined petroleum coke.Real density,bydefinition is obtained when the particle size of the specimen issmaller than 75 m(U.S.No.200 Sieve).1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2D346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4292 Test Method for Determination of Vibrated BulkDensity of Calcined Petroleum CokeD4930 Test Method for Dust Control Material on CalcinedPetroleum CokeE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 calcined petroleum coke,npetroleum coke that hasbeen thermally treated to drive off the volatile matter and todevelop crystalline structure.3.1.2 petroleum coke,na solid,carbonaceous residueproduced by thermal decomposition of heavy petroleum frac-tions or cracked stocks,or both.3.2 Definitions of Terms Specific to This Standard:3.2.1 bulk density,nthe mass of the particles divided bythe volume they occupy which includes the space between theparticles.Refer to Test Method D4292 for bulk densityprocedures.3.2.2 dedusting material,nSee Test Method D4930.3.2.3 real density,n(RD)(also be referred to as truespecific gravity).The mass divided by the volume occupied bythe material excluding pores and voids.It is required,therefore,that voids in the coke be eliminated and that pores in thematerial be filled by the fluid being displaced.This requirementis met for the purposes of this test method by reducing the cokeparticles to a size smaller than 75 m.3.2.3.1 DiscussionThe density of particles larger than75 m up to the largest that can be put into the heliumpycnometer can also be determined,but must be designated asparticle density(PD).The precision data obtained for RD maynot be applicable to PD.4.Summary of Test Method4.1 A representative sample of calcined petroleum coke isdried and ground to pass a 75 m(200-mesh)screen.The massof the sample is determined directly and the volume derived bythe volume of helium displaced when the sample is introduced1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved Oct.1,2015.Published December 2015.Originallyapproved in 1991.Last previous edition approved in 2010 as D2638 10.DOI:10.1520/D2638-10R15E01.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 into a helium pycnometer.The ratio of the mass of the sampleto the volume is reported as the real density.5.Significance and Use5.1 The real density of calcined petroleum coke directlyinfluences the physical and chemical properties of the manu-factured carbon and graphite artifacts for which it is used.Density,therefore,is a major quality specification of calcinedpetroleum coke and is used as a control in coke calcination.6.Interferences6.1 Oil or other dedust material sprayed on calcined petro-leum coke to control dust will interfere with the determinationof real density so the oil must be removed before reducing thesample to 75 m.Refer to Test Method D4930 for dedust oilremoval.7.Apparatus7.1 Analytical Balance,accurate to 60.1 mg.7.2 Desiccator.7.3 Drying Oven,preferably a vacuum oven,for tempera-ture to 120 C.7.4 Helium Pycnometer:7.5 Jaw Crusher and Roll CrusherOther style crusherswhich allow control over particle size without contaminationare acceptable.7.6 Riff