ASTM_D_2639_-_D_2639M_-_21a.pdf

Designation:D2639/D2639M21aStandard 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 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system are not necessarily exact equiva-lents;therefore,to ensure conformance with the standard,eachsystem shall be used independently of the other,and valuesfrom the two systems shall not be combined.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.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,(DDPM),nas used in thistest method,the stirrer rotation rate as measured by theaccumulated rotations(full or partial)of the stirrer recordedover sequential 1 min periods based upon 100 dial divisions foreach complete 360 rotation of the stirrer.3.1.2.1 DiscussionHistorically stirrer rotations were re-corded on manual plastometers by a simple timed observationof the total rotations at the completion of each sequential wholeminute interval as the furnace was ramped over the requiredtemperature range.Modern instruments have the ability torecord the accumulated stirrer rotations at any given pointduring the test and as such can present the DDPM over anydiscrete 60 s interval.For the purposes of this empiricalstandard and in order to ensure consistency betweeninstrumentation,the recorded DDPM shall be taken at the endof each sequential minute interval commencing at the start ofthe test and ending with the recorded solidification tempera-ture.That is to say,upon regaining the initial temperature of300 C,total accumulated stirrer rotations shall be recorded attimes 00:01:00,00:02:00,00:03:00,00:04:00,etc.until thesolidification temperature is reached.3.1.3 initial softening temperature,nas used in this testmethod,the temperature at which the DDPM(see 3.1.2)firstreaches a reading of equal to or greater than 1.0.3.1.4 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.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 Dec.1,2021.Published January 2022.Originallyapproved in 1967.Last previous edition approved in 2021 as D2639/D2639M 21.DOI:10.1520/D2639_D2639M-21A.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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Commi