ASTM_D_2961_-_D_2961M_-_19.pdf

Designation:D2961/D2961M19Standard Practice forSingle-Stage Total Moisture Less than 15%in CoalReduced to 2.36 mm No.8 Sieve Topsize1This standard is issued under the fixed designation D2961/D2961M;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.Scope*1.1 This practice covers a single-stage procedure for thedetermination of total moisture less than 15%in coal reducedto 2.36 mm No.8 sieve topsize.This practice is for determi-nation of total moisture only.Materials subjected to this testshall not be used in the determination of other test parameters.It is recognized that the conditions of the test can increase thepotential for significant oxidation effects on some coals.If theoxidation potential is of concern,the use of this single-stagemethod shall involve prior agreement between the partiesinvolved.This practice shall not be construed as the refereestandard practice for total moisture.For referee purposes,usersof this practice are referred to Test Method D3302/D3302M formoisture determination methods which are not as susceptible tooxidation effects.1.2 Statistical analysis of data from several sources indi-cates that at a 95%confidence level,there is statistically nodifference between the mean value of the results obtained byPractice D2961/D2961M and Test Method D3302/D3302M(that is,no bias is detected between the two methods at the95%confidence level)for moisture levels between 1.4%and15.8%.These two standards were not compared in this studyfor some ranks of coal including lignite and anthracite.21.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.4 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.1.5 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:3D121 Terminology of Coal and CokeD2013/D2013M Practice for Preparing Coal Samples forAnalysisD3302/D3302M Test Method for Total Moisture in Coal3.Terminology3.1 DefinitionsFor additional definitions of terms used inthis practice,refer to Terminology D121.4.Summary of Practice4.1 Moisture is determined by establishing the mass loss ofthe coal sample by drying in an oven with forced-air circula-tion.5.Significance and Use5.1 The measurement of total moisture is required to deter-mine whether coal meets commercial or environmentalspecifications,or both.Within the limitations prescribed in thescope,this practice describes a procedure for determination oftotal moisture that requires less time than the proceduresdescribed in Test Method D3302/D3302M.6.Apparatus6.1 Drying Pans,noncorrodible,stable at the temperatureused,and of such size that the sample can be spread to a depthof not more than 25 mm 1 in.1This practice is under the jurisdiction of ASTM Committee D05 on Coal andCoke and is the direct responsibility of Subcommittee D05.21 on Methods ofAnalysis.Current edition approved March 1,2019.Published March 2019.Originallyapproved in 1971.Last previous edition approved in 2018 as D2961/D2961M 18a.DOI:10.1520/D2961_D2961M-19.2Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D05-1024.ContactASTM CustomerService at serviceastm.org.3For 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.*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 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)Committee.1 6.1.1 The pan size may be varied to suit the size of thesample and the oven.The height of the sides shall b