1、Designation:D2013/D2013M12Standard Practice forPreparing Coal Samples for Analysis1This standard is issued under the fixed designation D2013/D2013M;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
2、 parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This practice2covers the reduction and division of grossor divi
3、ded samples,and the preparation of composite samples,up to and including the individual portions for laboratoryanalysis.1.2 Reduction and division procedures are prescribed forcoals of the following groups:1.2.1 Group A includes coals that have been cleaned in allsizes.1.2.2 Group B includes all oth
4、er coals.Unknown coals areto be considered under Group B.1.2.3 Group A allows smaller weight laboratory samples tobe retained than Group B.These lower weights may be used forparticular coals if they have been shown,by using theprocedures of Annex A1.2,to give a sample preparation andanalysis varianc
5、e which is no more than 20%of the totalanalysis variance.1.3 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 fr
6、om the two systems may result in non-conformancewith the standard.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 and health practices and determine the applic
7、a-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D121 Terminology of Coal and CokeD2234/D2234M Practice for Collection of a Gross Sampleof CoalD3174 Test Method for Ash in the Analysis Sample of Coaland Coke from CoalD3302 Test Method for Total Moisture in Co
8、alD4749 Test Method for Performing the Sieve Analysis ofCoal and Designating Coal SizeE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and Statistics3.Terminology3.1 Definitio
9、ns of Terms Specific to This StandardNoterms are used which are specific to this practice.Many termsused in this practice may be found in Terminologies D121 andE456 and in Practice E177.4.Summary of Practice4.1 Three processes of sample division and reduction arecovered as follows:4.1.1 Procedure AM
10、anual riffles are used for division ofthe sample and mechanical crushing equipment for the reduc-tion of the sample.4.1.2 Procedure BMechanical sample dividers are usedfor the division of the sample and mechanical crushingequipment for the reduction of the sample.4.1.3 Combined Procedure A and BThe
11、two proceduresmay be combined at any stage.1This practice is under the jurisdiction of ASTM Committee D05 on Coal andCoke and is the direct responsibility of Subcommittee D05.23 on Sampling.Current edition approved April 1,2012.Published June 2012.Originallyapproved in 1962.Last previous edition app
12、roved in 2011 as D2013/D2013M 11.DOI:10.1520/D2013_D2013M-12.2For more detailed explanation of this practice see Keller,G.E.,“Determinationof Quantities Needed in Coal Sample Preparation and Analysis,”Transactions,Vol232,1965,pp.218-226.3For referenced ASTM standards,visit the ASTM website,www.astm.
13、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 5.Significance and
14、Use5.1 Other standards are used to collect the gross sample:Practice D2234/D2234M allows for one division of the grosssample before crushing.The mass and top size of the gross ordivided sample collected by using these guides and practicesare usually too large for chemical or physical testing.Practic
15、eD2013 provide instructions for reducing and dividing the grossor divided sample,by on-line or off-line processes,or both,toa top size and mass suitable to the performance of testing.Anybias in the gross or divided sample before adherence to thispractice will remain in the final sample resulting fro
16、m use ofthis practice.Therefore,carefully select the standard to be usedto collect the gross sample.5.2 Division and reduction of a sample may occur at morethan one location.Most often,the sample is collected,reduced,and divided(one or more times)by use of a mechanicalsampling system.The remaining sample may be further di-vided on-site to facilitate transporting it to the laboratory wherefurther reduction and division likely occurs before analysis.5.3 In places,this practice requires air drying
