ASTM_D_6354_-_12.pdf

Designation:D635412Standard Guide forSampling Plan and Core Sampling of Carbon CathodeBlocks Used in Aluminum Production1This standard is issued under the fixed designation D6354;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.Scope*1.1 This guide covers sampling of carbon cathode blocksused in the production of aluminum,and details procedures fortaking samples from single cathode blocks.It covers equip-ment and procedures for obtaining samples from cathodeblocks in a manner that does not destroy the cathode block orprevent its subsequent use as originally intended.However,theuser must determine the subsequent use of the sampled cathodeblocks.Preferred locations for taking samples from single unitsof cathode blocks 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.Cathode blocks used in the production ofaluminum have specific requirements of 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,andC1225.2.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 ElectrodesC1225 Specification for Fiber-Cement Roofing Shingles,Shakes,and Slates2.2 ISO Standards:3ISO 8007-1 Carbonaceous materials used in the productionof aluminum-Cathodic blocks-Sampling plan andsampling from single cathodic blocksISO 5022 Shaped refractory products-Sampling and accep-tance testing3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 cathode block,none manufactured unit used as anegative carbon electrode.3.1.2 sample,na portion of carbon obtained from acathode block.3.1.3 test specimen,na representative piece of a sample.4.Significance and Use4.1 Core sampling is an acceptable way of obtaining a testspecimen without destroying the usefulness of a cathode block.4.1.1 Test specimens obtained by this guide can be used byproducers and users of cathode blocks for the purpose ofconducting the tests in Note 1 to obtain comparative physicalproperties.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 April 15,2012.Published May 2012.Originallyapproved in 1998.Last previous edition approved in 2008 as D635498(2008).DOI:10.1520/D6354-12.2For 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.*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 4.2 Sampling shall not weaken the cathode block or increasethe likelihood of premature failure.Extreme care shall beexercised when taking vertically drilled samples.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 Sampling locations for cathode blocks that werevibrated,pressed,or extruded without a collector bar slot willdiffer from those cathode blocks that were formed withcollector bar slots.6.1.1 For cathode blocks without collector bar slots,s