ASTM_D_7430_-_D_7430M_-_21.pdf

Designation:D7430/D7430M21Standard Practice forMechanical Sampling of Coal1This standard is issued under the fixed designation D7430/D7430M;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 parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONAnalysis data obtained from coal samples are used in establishing price,controlling mine andcleaning plant operations,allocating production costs,and determining plant or component efficiency.The task of obtaining a sample of reasonable mass to represent an entire lot presents a number ofproblems and emphasizes the necessity for using standard sampling procedures.Coal is one of the most difficult of materials to sample,varying in composition from noncombus-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 overall requirements for the collection and within-system preparation of coalsamples through the use of mechanical sampling systems utilizing falling-stream,cross-belt,and augerdesigns.This practice also gives the overall requirements for the bias testing and quality managementof mechanical coal sampling systems.The wide varieties of coal-handling facilities preclude thepublication of detailed procedures for every sampling situation.The proper collection of the sampleinvolves an understanding and consideration of the physical character of the coal,the number andmass of increments,and the overall precision required.1.Scope1.1 This practice is divided into four parts:A,B,C,and D.These four parts represent the previous Practices D7256/D7256M,D4916,D4702,and D6518.These four standards arethe four that govern the mechanical sampling of coal and havebeen combined into one document for the ease of reference ofthe users of these standards.1.2 The scope of Part A can be found in Section 4.1.3 The scope of Part B can be found in Section 13.1.4 The scope of Part C can be found in Section 19.1.5 The scope of Part D can be found in Section 32.1.6 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 establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see Sections 7,16,21,35,and38.1.1.1.7 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 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 forAnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD3302 Test Method for Total Moisture in CoalD4621 Guide for Quality Management in an OrganizationThat Samples or Tests Coal and Coke(Withdrawn 2010)3D4702 Practice for Quality Management of MechanicalCoal Sampling Systems(Withdrawn 2008)31This 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 June 1,2021.Published July 2021.Originally approvedin 2008.Last previous edition approved in 2020 as D7430/D7430M 20.DOI:10.1520/D7430_D7430M-21.2For 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 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)Committee.1D4749 Test Method for Performing the Sieve Analysis ofCoal and Designating Coal SizeD4916 Practice for MechanicalAuger Sampling(Withdrawn2008)3D6518 Practice for Bias Testing a Mechanical Coal Sam-pling System(Withdrawn 2008)3D7256/D7256M Practice for Mechanical Collection andWithin-System Preparation of a Gross Sample of Coalfrom Moving Streams(Withdrawn 2008)3E105 Guide for Probability Sampling of MaterialsE122 Practice for Calculating Sample Size to Estimate,WithSpecified