1、Designation:D6347/D6347M05(Reapproved 2010)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 may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard does not purport to address all of thesafety concern
8、s,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 limitations prior to use.The equipment usesradioactive materials,which may be hazardous to the health ofusers,unl
9、ess proper precautions are taken.2.Referenced Documents2.1 ASTM Standards:2D1586 Test Method for Penetration Test(SPT)and Split-Barrel Sampling of SoilsD6172 Test Method for Determining the Volume of BulkMaterials Using Contours or Cross Sections Created byDirect Operator Compilation Using Photogram
10、metric Pro-cedures2.2 NIST Standard:National Institute for Standards and Technology Handbook44,Specifications,Tolerances,and Other Technical Re-quirements for Weighing and Measuring Devices32.3 ASME Standard:ASME Pipe Codes41This test method is under the jurisdiction of ASTM Committee D05 on Coaland
11、 Coke and is the direct responsibility of Subcommittee D05.07 on PhysicalCharacteristics of Coal.Current edition approved Sept.1,2010.Published January 2011.Originallyapproved in 1998.Last previous edition approved in 2005 as D6347/D6347M 05.DOI:10.1520/D6347_D6347M-05R10.2For referenced ASTM standa
12、rds,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.3Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,
13、Gaithersburg,MD 20899-1070,http:/www.nist.gov.4Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United
14、States1 2.4 Code of Federal Regulations:Title 10,Parts 19 and 205Title 4953.Terminology3.1 Definitions of Terms:3.1.1 counting periodthe period of time,set using thescaler time switch,during which the readout device accumu-lates pulses.3.1.2 test countsthe recording of pulses accumulated bythe reado
15、ut device during a counting period.The test count isinitiated by pushing a start button located on the scaler,whichresets the accumulator and starts a new counting period.3.1.3 standard counta test count taken with the probepositioned inside the shield and standard assembly.3.1.4 reference standard
16、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 in9.1.6.3.1.6 access holeused loosely in this standard to denotethe opening made into the stockpile for insertion of the probeaccess tube.3.1.7 penetrationinserting the probe access tube in aselected position for collecting test count readings.3.1.8 vertical positionthe position of the probe whe
