ASTM_D_293_-_93_2010.pdf

Designation:D29393(Reapproved 2010)Standard Test Method for theSieve Analysis of Coke1This standard is issued under the fixed designation D293;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 test method describes the separation of a cokesample into defined size fractions and expressing said fractionsas a weight percent of the gross sample.1.2 The values stated in SI units are to be regarded as thestandard.Inch-pound units shall be accepted on an equivalentbasis.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for Laboratory AnalysisD4621 Guide for Quality Management in an OrganizationThat Samples or Tests Coal and Coke(Withdrawn 2010)3E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE323 Specification for Perforated-Plate Sieves for TestingPurposes3.Significance and Use3.1 This test method determines the size distribution of cokefor conformance to specifications of percentages retained ondesignated screen sizes.4.Apparatus4.1 SievesUse square-hole sieves conforming to Specifi-cation E11.Where sieves larger than 100 mm(4 in.)arerequired,the specifications for same shall be by mutualagreement between interested parties.Permissible variations insieve openings and spacings shall be in accordance withSpecification E11.4.1.1 For complete characterization of the size range of acoke sample,the number and size of the selected sieves shouldbe such that no more than 25%of the gross sample weight willbe retained on any given sieve.4.1.2 For coke 38.1 mm(112in.)and larger in size,sievesof heavy double-crimped wire and square or rectangular frameswith 0.56 to 0.84 m2(6 to 9 ft2)of sieve area are satisfactory.For coke smaller than 38.1 mm(112in.)in size,sieves ofdouble-crimped wire and square or circular frames with 0.19 to0.37 m2(2 to 4 ft2)of sieve area are usually more convenient.4.2 Weighing Balance,preferably of the platform type,having a sensitivity of 0.025 kg(0.05 lbs)or better,at ratedcapacity and with graduations such that 0.05 kg(0.1 lb)can beread without interpolation.5.Test Sample5.1 The test sample shall be taken in accordance withPractice D346.6.Procedure6.1 Starting with the sieve having the largest opening,sievethe sample of coke in quantities small enough to preventplugging and clogging of the sieve.6.1.1 Hand-fit each piece of coke retained on the 38.1-mm(112-in.)or larger sieve.A piece is considered undersize,if insome position and without forcing,it passes the sieve opening.6.1.2 Shake vigorously on each succeeding sieve cokepieces passing the 38.1-mm(112-in.)sieve.This shaking maybe performed manually or mechanically provided mechanicalshaking yields results equivalent to manual shaking.Note thatthe objectives of shaking,either manual or mechanical,are toplace all of the naturally occurring pieces of a given size rangeon the appropriate sieve and to avoid degradation of thenaturally occurring sizes.6.2 Record to the nearest 0.05 kg(0.1 lb)the weight of cokeretained on each sieve and that which passes the smallest sieveused.For routine testing,the sum of all the size-fractionweights may be taken as the total weight of coke tested.1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.15 on MetallurgicalProperties of Coal and Coke.Current edition approved May 1,2010.Published May 2010.Originallyapproved in 1928.Last previous edition approved in 2004 as D293 93(2004).DOI:10.1520/D0293-93R10.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2.1 Samples containing pieces retained on 50-mm(2-in.)sieves and larger,need not be dried.However,when a higherdegree of accuracy is desired,dry the gross sample to less than1%moisture and accurately weigh before sieving.Dry allsamples of coke containing only pieces which pass a 50-mmsieve to less than 1%moisture before testing.7.Report7.1 Report the weights of the size fractions as a percentageof the weight of the gross sample.Calculate percentage to thenearest 0.1%.Record the results starting with the fraction oflar