1、Designation:D2234/D2234M20Standard Practice forCollection of a Gross Sample of Coal1This standard is issued under the fixed designation D2234/D2234M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number i
2、n parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONData obtained from coal samples are used in establishing price,controlling mine and cleaning plantoperations,allocating production costs,and deter
3、mining plant or component efficiency.The task ofobtaining a sample of reasonable mass to represent an entire lot presents a number of problems andemphasizes the necessity for using standard sampling procedures.Coal is one of the most difficult of materials to sample,varying in composition from nonco
4、mbus-tible particles to those which can be burned completely,with all gradations in between.The task isfurther complicated by the use of the analytical results,the sampling equipment available,the quantityto be represented by the sample,and the degree of precision required.This practice gives the ov
5、erall requirements for the collection of coal samples.The wide varietiesof coal-handling facilities preclude the publication of detailed procedures for every sampling situation.The proper collection of the sample involves an understanding and consideration of the physicalcharacter of the coal,the nu
6、mber and mass of increments,and the overall precision required.1.Scope1.1 This practice covers procedures for the collection of asample under various conditions of sampling and directs theuser to the appropriate ASTM standard for that samplingcondition.The sample is to be crushed and further prepare
7、d foranalysis in accordance with Practice D2013/D2013M.However,the procedures for dividing large samples before anycrushing are given in this practice.1.2 This practice describes general and special purposesampling procedures for coals(1)by size and condition ofpreparation(for example,mechanically c
8、leaned coal or rawcoal)and(2)by sampling characteristics.1.3 UnitsThe values stated in either SI units or non-SIunits are to be regarded separately as standard.The valuesstated in each system are not necessarily exact equivalents;therefore,to ensure conformance with the standard,eachsystem shall be
9、used independently of the other,and valuesfrom the two systems 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 p
10、ractices 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
11、and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD2013/D2013M Practice for Preparing Coal Samples forAnalysisD4749 Test Method for Performing the Sieve Analysis ofCoal and D
12、esignating Coal SizeD6609 Guide for Part-Stream Sampling of CoalD6883 Practice for Manual Sampling of Stationary Coalfrom Railroad Cars,Barges,Trucks,or StockpilesD7430 Practice for Mechanical Sampling of CoalE456 Terminology Relating to Quality and Statistics3.Terminology3.1 DefinitionsDefinitions
13、applicable to this practice arelisted in Terminology D121.1This 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 1,2020.Published April 2020.Originallyapproved in 1963.Last prev
14、ious edition approved in 2019 as D2234/D2234M 19.DOI:10.1520/D2234_D2234M-20.2For 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 AS
15、TM 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
16、 International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.3.2 Definitions of Terms Specific to This Standard:3.2.1 accuracy,n3.2.1.1 generallya term used to indicate the reliability of asample,a measurement,or an observation.3.2.1.2 specificallya measure of closeness of agreementbetween an experimental result and the true value.Example:the observed and true sulfur content of a coal consignment.This measure is affected by
