1、Designation:D688317Standard Practice forManual Sampling of Stationary Coal from Railroad Cars,Barges,Trucks,or Stockpiles1This standard is issued under the fixed designation D6883;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y
2、ear of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers procedures for obtaining a manualgross sample from beneath the surface of coal in railroad cars
3、,barges,trucks,or stockpiles.These procedures are to be used toprovide gross samples for estimating the quality of the coal.The gross samples are to be crushed,divided,and furtherprepared for analysis in accordance with Practice D2013.1.2 This practice provides instruction for sampling beneaththe ex
4、posed surface coal to a depth of approximately 61 cm(24in.).Collect samples at this depth to get below the surface ofthe material,since drying and oxidation may have occurred at,or near the surface.Changes in moisture,in particle size,andin other properties continue to occur deeper in the coal and,a
5、lthough not as drastic as near the surface,will cause themethod to be biased.The user should review the conditions ofthe coal(weather conditions,prior transport,settling time,andso forth,see 8.1)so that the interested parties can agree thatpotential biases are not overly great or that some adjustmen
6、t inspecifications is warranted.Sample increments collected fromthe surface layer(s)of coal in railroad cars,barges,or stock-piles are classified condition“D”(see Practice D2234/D2234M,Increment Collection Classification).It is a goodpractice to require that“details of sampling procedure shall beagr
7、eed upon in advance by all parties concerned”whenevercollection of sample increments falls under condition“D.”Thispractice offers a sampling procedure that parties may use tomeet requirements of Practice D2234/D2234M for condition“D.”The practice does not produce samples that satisfyprecision requir
8、ements of Practice D2234/D2234M general-purpose sampling,or Practice D2234/D2234M special-purposesampling.1.3 The user is cautioned that samples of this type do notsatisfy the minimum requirements for probability sampling andas such cannot be used to draw statistical inferences such asprecision,stan
9、dard error,or bias.1.4 This sampling method is intended for use only whensampling by more reliable methods that provide a probabilitysample is not possible.1.5 The quantities stated in either acceptable SI units or ininch-pound units are regarded separately as standard.Thequantities stated in each s
10、ystem may not be exact equivalents;therefore,each system must be used independently of the other,without combining quantities in any way.1.6 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 esta
11、blish appro-priate safety,health,environmental practices and determinethe applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for the
12、Development of International Standards,Guides 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 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice fo
13、r Collection of a Gross Sampleof CoalD4749 Test Method for Performing the Sieve Analysis ofCoal and Designating Coal SizeD4916 Practice for MechanicalAuger Sampling(Withdrawn2008)3E105 Practice for Probability Sampling of MaterialsE177 Practice for Use of the Terms Precision and Bias inASTM Test Met
14、hodsE456 Terminology Relating to Quality and Statistics1This 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 Oct.15,2017.Published October 2017.Originallyapproved in 2003.Last previo
15、us edition approved in 2012 as D688304(2012).DOI:10.1520/D6883-17.2For 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.
16、3The last approved version of this historical standard is referenced onwww.astm.org.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)Comm
