1、Designation:D688304(Reapproved 2012)Standard 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
2、of revision,the year 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
3、 in railroad cars,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 sampl
4、ing beneaththe exposed 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
5、in the coal and,although 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 th
6、at some adjustment 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 proc
7、edure shall beagreed 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 satisf
8、yprecision requirements 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
9、 asprecision,standard 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
10、 stated in each system 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
11、 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 CokeD2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collectio
12、n 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 MethodsE456 Te
13、rminology Relating to Quality and Statistics3.Terminology3.1 Definitions:3.1.1 consignment,na discrete amount of coal,such as ashipment,a carload,a unit train,or a days production.Aconsignment may include more than one lot of coal and maycorrespond to a specific period of time such as sampling perio
14、dor billing period.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 Nov.1,2012.Published December 2012.Orginallyapproved in 2003.Last previous edition approved in 2004 as D68830
15、4.DOI:10.1520/D6883-04R12.2For 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.3The last approved version of this histo
16、rical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.2 particle segregation,nthe segregation of sized par-ticles to specific areas as a result of the particles rolling,falling,or sliding down the sides of a pile or a result of the peculiaritiesof a coal handling system used to build the pile.Particlesegregation is a process of separation,not exclusively by size,but by size,shape,and density.3
