1、Designation:D660908(Reapproved 2015)Standard Guide forPart-Stream Sampling of Coal1This standard is issued under the fixed designation D6609;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parent
2、heses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide covers general principles for obtaining agross sample of coal by taking increments from part of a streamof coal rather than from the entire stre
3、am to be sampled.Theusefulness of results from this guide will vary greatly depend-ing on such factors as top size of the coal,size consistency ofthe coal,variability of the coal,and such logistical factors asthe flow rate of the coal in process and physical accessibility ofthe sampling station.1.2
4、This guide should be used only when it is not possible touse a method of sampling that produces a probability sample.1.3 Sample preparation procedures involving crushing arecontained in Practice D2013.1.4 The values stated in SI units are to be regarded asstandard.The values in parentheses are for i
5、nformation only.1.5 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 applica-bility of regulatory requirements prior to use.2
6、.Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalE456 Terminology Relating to Quality and Statistics2.2 Federal Standards:Federal Mine and Safety and Health Act
7、 of 19773Occupational Safety and Health Act of 197033.Terminology3.1 DefinitionsFor additional definitions of terms,refer toTerminology D121,Practice D2013,Terminology E456,andPractice D2234/D2234M.3.2 Definitions of Terms Specific to This Standard:3.2.1 part-stream sampling,na method of coal sampli
8、ngin which collection of individual increments does not encom-pass the full cross section of the coal stream.4.Summary of Guide4.1 Part-stream sampling is accomplished by collectingincrements from part of a stream of coal for the purpose ofacquiring a gross sample.5.Significance and Use5.1 This guid
9、e provides instructions for sampling by col-lecting individual increments from part of a cross section of amoving stream of coal,as opposed to collection of individualincrements by removal of a full cross section of material.Theuse of part-stream sampling,and the detailed procedures foreach case,sho
10、uld be agreed upon in advance by all partiesconcerned.Samples collected by use of this guide are notprobability samples.The user is cautioned that samples of thistype do not satisfy the minimum requirements for probabilitysampling and as such cannot be used to obtain any meaningfulstatistical infere
11、nces such as the sampling precision,standarderror,or bias.5.2 All parties should be cautioned that manual sampling ofcoal from a moving stream might not enable sampling of thematerial that is furthermost from the point of entry into streamby the sampling device.6.Increment Collection Classification6
12、.1 Three distinct classifications of part-stream samplingmethods are recognized by this guide,in order of preference,aslisted below:6.1.1 Condition C-1The case in which groups of succes-sive part-stream increments are taken so that the incrementswithin each group encompass the full cross section of
13、the coalstream.1This guide 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 1,2015.Published May 2015.Originallyapproved in 2000.Last previous edition approved in 2008 as D6609-08 DOI:10
14、.1520/D6609-08R15.2For 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.3.Available from Standardization Documents Order
15、 Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.1.2 Condition C-2The case in which groups of succes-sive part-stream increments are collecte
16、d from different posi-tions relative to the full cross section of the coal stream but theincrements within each group do not encompass the full crosssection.6.1.3 Condition C-3The case in which groups of succes-sive part-stream increments are collected from the samerelative position to the full cross section of the coal stream.7.Organization and Planning of Sampling Operations7.1 Considerations When Sampling from a Coal Stream:7.1.1 Safety ConsiderationsIf the sampling device is to beused manual