1、Designation:D3302/D3302M15Standard Test Method forTotal Moisture in Coal1This standard is issued under the fixed designation D3302/D3302M;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 parenthes
2、es 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 the measurement of the totalmoisture in coal as it exists at the site,at the time,and underthe conditions it is sampled.It is applicab
3、le to coals as mined,processed,shipped,or used in normal commercial pursuits.Itis not applicable to coal-water slurries,sludges,or pulverizedproducts under 0.5-mm-diameter sieve size.It is applicable tocoals of all ranks within the recognized limitations imposed byoxidation and decomposition charact
4、eristics of lower rankcoals.Because of its empirical nature,strict adherence to basicprinciples and permissive procedures are required for validresults(see Appendix X1).This complete standard is availableto producers,sellers,and consumers as a total moisture methodwhen other procedures or modificati
5、ons are not mutuallyagreed on.1.2 Since coal can vary from extremely wet(water-saturated)to completely dry,special emphasis must be placedon the sampling,sample preparation,and the moisture deter-mination itself to ensure total reliability of measurement.Therefore,this standard entails collection of
6、 the gross sample,sample preparation,and the method of determination.1.3 While it is recognized that such a standard may beunwieldy for routine usage in commercial operations,it canprovide a common base for agreement in cases of dispute orarbitration.The complete standard is referred to as the refer
7、eemethod.Embodied in the standard is the commercial methodstarting with the crushed and divided sample when the grosssample is not too wet to crush and divide.See Test MethodsD2961 and D3173 for other moisture methods.1.4 The values stated in either SI units or inch-pound unitsare to be regarded sep
8、arately 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 concerns,i
9、f 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:2D121 Terminology of Coal and CokeD388 Classificat
10、ion of Coals by RankD2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD2961 Test Method for Single-Stage Total Moisture Lessthan 15%in Coal Reduced to 2.36-mm(No.8 Sieve)TopsizeD3173 Test Method for Moisture in the Analysis Sample ofCo
11、al and CokeD5865 Test Method for Gross Calorific Value of Coal andCokeD7430 Practice for Mechanical Sampling of Coal3.Terminology3.1 DefinitionsFor additional definitions of terms used inthis test method,refer to Terminology D121.3.2 Definitions of Terms Specific to This Standard:3.2.1 air dryinga p
12、rocess of partial drying of a coalsample to bring it to near equilibrium with the atmosphere inthe room in which further reduction/division of the sample is totake place.3.2.2 air-dry lossthe loss in weight,expressed as apercent,resulting from each air-drying operation.3.2.3 easily oxidized coalslow
13、-rank coals such as subbi-tuminous or lignitic coals.3.2.4 equilibriumcondition reached in air drying when thechange in weight of the sample,under conditions of ambienttemperature and humidity,is no more than 0.1%h or0.05%12h.1This test method is under the jurisdiction of ASTM Committee D05 on Coala
14、nd Coke and is the direct responsibility of Subcommittee D05.21 on Methods ofAnalysis.Current edition approved Jan.1,2015.Published January 2015.Originallyapproved in 1974.Last previous edition approved in 2012 as D3302/D3302M12.DOI:10.1520/D3302_D3302M-15.2For referenced ASTM standards,visit the AS
15、TM 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
16、 3.2.5 residual moisturethat moisture remaining in thesample after air drying.3.2.6 total moisturesee Terminology D121.4.Summary of Test Method(See Fig.1)4.1 This test method is based on the loss in weight of a coalsample in an air atmosphere under rigidly controlled conditionsof temperature,time,and airflow.4.2 Alternative Methods:4.2.1 Referee Method,which may be used in cases ofdispute or arbitration.The gross moisture sample is air dried toequilibrate it with the atmosphere at each stage of