ASTM_D_2639_-_D_2639M_-_13.pdf

Designation:D2639/D2639M13Standard Test Method forPlastic Properties of Coal by the Constant-Torque GieselerPlastometer1This standard is issued under the fixed designation D2639/D2639M;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 covers a relative measure of the plasticbehavior of coal when heated under prescribed conditions.Thistest method may be used to obtain semiquantitative values ofthe plastic properties of coals and blends used in carbonizationand in other situations where determination of plastic behaviorof coals is of practical importance.1.2 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.1.3 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:2D2013/D2013M Practice for Preparing Coal Samples forAnalysisD2234/D2234M Practice for Collection of a Gross Sampleof Coal3.Terminology3.1 Definitions:3.1.1 breaking,vfree spinning behavior of coal,either byan abrupt change to rotating at maximum motor speed or byabrupt changes in rotation,which occurs as a result of a moltenball of coal forming around the base of the stirrer,and whichmakes reporting of the true maximum fluidity of the coaldifficult.3.1.2 dial division per minute,nas used in this testmethod,a measure of stirrer rotation rate.There are 100 dialdivisions for each full 360 rotation of the stirrer.Stirrerrotation rate is total dial divisions turned by the stirrer in a oneminute time period.3.1.3 initial softening temperature,nas used in this testmethod,the temperature at which the stirrer rotation rate firstreaches 1.0 dial divisions per minute.3.1.4 jamming,vswelling up of coal into the retort tubeduring the test,which may produce lower fluidity results thanexpected and can only be noted after visual inspection of thedisassembled crucible and retort at the conclusion of the test.3.1.5 maximum fluidity,nas used in this test method,themeasured maximum stirrer rotation rate,in dial divisions perminute.3.1.6 maximum fluidity temperature,nas used in this testmethod,the temperature at which stirrer rotation rate reaches amaximum value.3.1.7 plastic range,ndifference between the solidificationtemperature and the initial softening temperatures.3.1.8 solidification temperature,nas used in this testmethod,the temperature at which the the first zero ddpm isreached after the last stirrer rotation.4.Summary of Test Method4.1 The plastometer measures the plastic properties of coalsby the use of a constantly applied torque on a stirrer placed ina crucible into which the coal is charged.The crucible isimmersed in a bath and the temperature increased uniformly.The rates of movement of the stirrer are recorded in relation toincrease in temperature.5.Significance and Use5.1 Reliable values of the plastic properties of coals are usedto predict or explain the behavior of a coal or blends duringcarbonization or in other processes such as gasification,liquefaction,and combustion.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.1,2013.Published December 2013.Originallyapproved in 1967.Last previous edition approved in 2008 as D263908.DOI:10.1520/D2639_D2639M-13.2For 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 6.Apparatus6.1 Gieseler PlastometerThe apparatus shall consist ofthe following:6.1.1 RetortA steel retort consisting of four parts asshown in Fig.1.6.1.2 RetortCrucible,cylindrical,21.4 6 0.08mm0.844 6 0.003 in.in inside diameter and 35.0 mm 1.38 in.in depth,with exterior threads for joining the crucible to thecrucible cover.The crucible shall have a 2.38-6 0.02-mmFIG.1 Retort AssemblyD2639/D2639M 132 0.094-6 0.001-in.diameter notch in the center of its insidebase to serve as a seat for the stirrer.6.1.3 Retort Crucible Cover,with interior threads for joiningthe crucible cover to the crucible and exterior threads forjoining the cr