ASTM_D_6353_-_06_2011.pdf

Designation:D635306(Reapproved 2011)Standard Guide forSampling Plan and Core Sampling for Prebaked AnodesUsed in Aluminum Production1This standard is issued under the fixed designation D6353;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.1.Scope1.1 This guide covers sampling for prebaked carbon anodesused in the production of aluminum,and details procedures fortaking test samples from anode blocks.It covers equipment andprocedures for obtaining samples from anode blocks in amanner that does not destroy the block or prevent its subse-quent use as originally intended.However,the user mustdetermine the subsequent use of the sampled anode blocks.Preferred locations for taking samples from single units ofanodes are covered in this guide.1.1.1 Information for sampling of shaped refractoryproducts,in general,is given in ISO 5022.This standard detailsthe statistical basis for sampling plans for acceptance testing ofa consignment or lot.Anodes used in the production ofaluminum have specific requirements for sampling and whilethe statistical basis for sampling given in ISO 5022 applies,further or modified requirements may also apply.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.NOTE1The followingASTM standards are noted as sources of usefulinformation:Test Methods C559,C611,C651,C747,C1025,C1039,andE1225.2.Referenced Documents2.1 ASTM Standards:2C559 Test Method for Bulk Density by Physical Measure-ments of Manufactured Carbon and Graphite ArticlesC611 Test Method for Electrical Resistivity of ManufacturedCarbon and Graphite Articles at Room TemperatureC651 Test Method for Flexural Strength of ManufacturedCarbon and GraphiteArticles Using Four-Point Loading atRoom TemperatureC747 Test Method for Moduli of Elasticity and FundamentalFrequencies of Carbon and Graphite Materials by SonicResonanceC1025 Test Method for Modulus of Rupture in Bending ofElectrode GraphiteC1039 Test Methods for Apparent Porosity,Apparent Spe-cific Gravity,and Bulk Density of Graphite ElectrodesE1225 Test Method for Thermal Conductivity of SolidsUsing the Guarded-Comparative-Longitudinal Heat FlowTechnique2.2 ISO Standards:3ISO 5022 Shaped refractory products-Sampling and accep-tance testing3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 block,na carbon anode,a single unit.3.1.2 prebaked,na baked carbon article or block.3.1.3 sample,nthe portion of carbon obtained from ananode.3.1.4 test specimen,nan article prepared from a sample.4.Significance and Use4.1 Core sampling is an acceptable way of obtaining a testspecimen without destroying the usefulness of an anode block.4.1.1 Test specimen obtained by this guide can be used byproducers and users of carbon anodes for the purpose ofconducting the tests in Note 1 to obtain comparative physicalproperties.4.2 Sampling shall not weaken the anode or increase thelikelihood of premature failure.1This guide is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved May 1,2011.Published August 2011.Originallyapproved in 1998.Last previous edition approved in 2006 as D635306.DOI:10.1520/D6353-06R11.2For 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 National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Apparatus5.1 Core Drill Bit,similar to that shown in Fig.1,driven bysuitable equipment.Use bits with cutting teeth coated withdiamond or other extremely hard material.6.Procedure6.1 Examples of sampling locations for anode blocks ofdifferent sizes and designs are shown in Fig.2.6.2 Dimensions of a cored test sample will depend upon thetest that is to be performed on the sample.Reference should bemade to the standards relating to the tests to be performed toensure that the samples taken are of suitable dimensions.Theminimum dimension(usually the diameter)should be at leastthree times the maximum particle size of the dry aggregateused in the manufacture of the anode b