ASTM_D_3402_-_D_3402M_-_93_2008.pdf

Designation:D3402/D3402M93(Reapproved 2008)Standard Test Method forTumbler Test for Coke1This standard is issued under the fixed designation D3402/D3402M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes a procedure for obtaining arelative measure of the resistance to degradation of coke byimpact and abrasion.1.2 Standard ProcedureThis procedure uses a cokesample sized to 75 mm 3 in.and+50 mm +2 in.1.3 Alternative ProcedureThis procedure using coke sized50%of 63 by 50 mm 212by 2 in.and 50%of 50 by 37.5mm 2 by 112in.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 This standard does not purport to address all of thesafety problems,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:D294 Method of Tumbler Test for Coke2D346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Method3.1 A sample of dry coke of designated size is tumbled in arotating drum at a specified turning rate for a specified numberof revolutions.Two indexes of its strength,the stability factorand the hardness factor,are determined by sieve analysis of thecoke after treatment.Studies have indicated that there is no realdifference in the stability factor as determined by the standardand alternative procedures.The alternative procedure produceshardness factor results averaging slightly higher than thestandard procedure.4.Significance and Use4.1 Coke undergoes various degrees of degradation duringremoval from coke ovens,transportation,and its decent withina blast furnace to the combustion zone.These processes subjectthe coke to impact and abrasion.This test method is a relativemeasure of the resistance of coke to breakage when subjectedto these degradation processes.5.Apparatus5.1 Tumbler Machine(see Fig.1)The tumbler machineconsisting of a cylindrical steel drum 910 mm 36 in.in insidediameter and 455 mm 18 in.in inside width and made of plateat least 6 mm 14in.thick.The machine may be constructedas a double drum mounted on a common shaft so that duplicatecoke samples may be tested at the same time.Two equallyspaced 50 by 50 by 6-mm 2 by 2 by14-in.steel anglesextending across the width of each drum are solidly fastenedinside each drum as shown.These angles are fastened to theshell so that the attached legs point away from the direction ofrotation,thus giving a clear unobstructed shelf for lifting thecoke.At least one door must be provided in each drum forcharging and discharging the coke sample.This door prefer-ably should extend nearly across the width of each drum.As analternative,a door in the side of the drum is permissible.During the test the door must be fastened rigidly to the shelland must fit into the shell in order to have a smooth continuousinner surface.A dust-tight gasket must be provided to preventloss of the abraded fines during the test.To provide for rotation,the drum is mounted on stub axles about 37.5 mm 112in.indiameter by means of flanges welded or bolted to the ends ofthe drum providing smooth inner surfaces.It is desirable thatthe apparatus be fitted with a revolution counter and preferablybe equipped with an automatic device to stop the drum after thespecified number of revolutions(1400).The tumbler drummust be replaced when the wear reduced the thickness to 3 mm18in.in any area.The lift angles must be replaced when theywear to less than 48 mm 178in.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 Oct.1,2008.Published February 2009.Originallyapproved in 1975.Last previous edition approved in 2001 as D3402 93(2001).DOI:10.1520/D3402_D3402M-93R08.2Withdrawn.The last approved version of this historical standard is referencedon www.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Sieves,for sieving the coke before and after the tumblertest.Square-mesh sieves having 75-mm 3-in.,63-mm 212-in.,50-mm 2-in.,37.5-mm 112-in.,25-mm 1-in.,and63-mm 14-in.actual openings between the wires to be used.The sieves shall conform to Specification E11.NOTE1Users attention is ca