1、Designation:D6347/D6347M05(Reapproved 2018)Standard Test Method forDetermination of Bulk Density of Coal Using NuclearBackscatter Depth Density Methods1This standard is issued under the fixed designation D6347/D6347M;the number immediately following the designation indicates theyear of original adop
2、tion 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.INTRODUCTIONData obtained from the density of coal stockpiles is combined with volume dete
3、rminations per TestMethod D6172 to complete the physical inventory of total tons.The book inventory is compared tothe physical inventory for determining the accumulation of measurement difference that have occurredsince the last physical inventory.Since the physical inventory is the reference value
4、used to compare and adjust the book inventory,it is important that the standard methods for conducting the density and volume measurementsintroduce the least possible error.Close adherence to the details of the procedures described in thisstandard is a prerequisite to the objective of this test meth
5、od.This standard test method for determination of bulk density of stockpiled coal is used for all ranksof coal.Proper density determination involves an understanding of the physical characteristics of thecoal types and the stockpiling facilities.1.Scope1.1 This test method covers procedures for dete
6、rmining thebulk density of coal using instrumentation that measures therelative backscatter of nuclear gamma radiation throughout thedepth of the stockpile under test.1.2 This procedure is applicable to all ranks of coal.1.3 The values stated in either SI units or inch-pound unitsare to be regarded
7、separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.4 This standard does not purport to address all of
8、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.The equipment uses radioactive materials,which may behaza
9、rdous to the health of users,unless proper precautions aretaken.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 and Recom-mendati
10、ons issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1586 Test Method for Standard Penetration Test(SPT)andSplit-Barrel Sampling of SoilsD6172 Test Method for Determining the Volume of BulkMaterials Using Contours or Cross Sec
11、tions Created byDirect Operator Compilation Using Photogrammetric Pro-cedures1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.07 on PhysicalCharacteristics of Coal.Current edition approved Nov.1,2018.Published Dece
12、mber 2018.Originallyapproved in 1998.Last previous edition approved in 2010 as D6347/D6347M 05(2010).DOI:10.1520/D6347_D6347M-05R18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume informatio
13、n,refer to the standards Document Summary page onthe ASTM 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 establis
14、hed 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.1 2.2 NIST Standard:3National Institute for Standards and Technology Handbook44,Specifications,Tolerances,and Ot
15、her Technical Re-quirements for Weighing and Measuring Devices2.3 ASME Standard:4ASME Pipe Codes2.4 Code of Federal Regulations:5Title 10,Parts 19 and 20Title 493.Terminology3.1 Definitions of Terms:3.1.1 access holeused loosely in this standard to denotethe opening made into the stockpile for inser
16、tion of the probeaccess tube.3.1.2 counting periodthe period of time,set using thescaler time switch,during which the readout device accumu-lates pulses.3.1.3 penetrationinserting the probe access tube in aselected position for collecting test count readings.3.1.4 reference standard counta series of 30 consecutivestandard counts,taken on the occasions specified in 9.1.5.3.1.5 stability check standard counta series of five con-secutive standard counts,taken on the occasions specified in9.1.6.3.1.