1、Designation: D 6542 05Standard Practice forTonnage Calculation of Coal in a Stockpile1This standard is issued under the fixed designation D 6542; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number i
2、n parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice is used to calculate the mass (commonlyexpressed in tons) of coal in a storage pile using the volume ofthe stockpile by Test Met
3、hod D 6172 and the density of thecoal determined by Test Method D 6347/D 6347M.1.2 This practice is applicable to all ranks of coal.1.3 The user of this standard determines when the densityvalues provided by the survey require an adjustment formoisture.1.4 The values stated in either inch-pounds or
4、SI units are tobe regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are notexact equivalents; therefore, each system must be used inde-pendently of the other. Combining values from the two systemscan result in nonconformance with th
5、e specification.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 limitations prior to use
6、.2. Referenced Documents2.1 ASTM Standards:2D 121 Terminology of Cola and CokeD 2013 Practice for Preparing Coal Samples for AnalysisD 3173 Test Method for Moisture in theAnalysis Sample ofCoal and CokeD 3302 Test Method for Total Moisture in CoalD 6172 Test Method for Determining the Volume of Bulk
7、Materials Using Contours of Cross Sections Created byDirect Operator Compilation Using Photogrammetric Pro-ceduresD 6347/D 6347M Test Method for Determination of BulkDensity of Coal Using Nuclear Backscatter Depth DensityMethods3. Terminology3.1 DefinitionsThere are no terms in this practice thatreq
8、uire new or other than dictionary definitions. Many terms inthis Practice may be found in Terminology D 121.4. Significance and Use4.1 The physical inventory of tons of coal in a stockpile, ascalculated by this practice, may be used for accounting and taxpurposes.4.2 The inventory results may be com
9、pared to other esti-mates of the inventory, such as:4.2.1 Tons from a previous inventory less tons shipped orconsumed.4.2.2 Tons estimated to have been received (from conveyor,rail or truck weights) less tons shipped or consumed.5. Procedure5.1 Determine if the reported tonnage should be on anas-det
10、ermined basis, or some other moisture adjusted basis. Ifthe moisture content was determined on the density-measurement samples (see Test Method D 6347/D 6347M),then the density data (and the tonnage) can be calculated to adry basis or to another moisture-containing basis.5.1.1 Use Eq 1 or Eq 2 to ad
11、just the as-determined densityto a different moisture basis. The percent moisture determinedin accordance with Test Methods D 3173, D 3302, or D 2013 inthe samples collected according Test Method D 6347/D 6347Mis used in Eq 1 or Eq 2.5.1.2 Use Eq 1 to adjust the average density values to a drybasis:
12、Ddry5 Ddet3S1 2Mdet100D(1)where:Ddry= density in lb/ft3(kg/m3) on a dry basis,Ddet= density in lb/ft3(kg/m3) on an as-determined mois-ture basis, andMdet= % moisture, as determined on the density sample.1This practice is under the jurisdiction of ASTM Committee D-5 on Coal andCoke and is the direct
13、responsibility of Subcommittee D05.07 on PhysicalCharacteristics of Coal.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 2000. Last previous edition approved in 2000 as D6542002For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custome
14、r Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.1.3 Use Eq 2 to adjust the as-determ
15、ined density values tosome other moisture basis such as as-received, as-shipped,as-stockpiled, etc.Dadj5 Ddet3S100 2 Madj100 2 MdetD(2)where:Dadj= density in lb/ft3(kg/m3) on a desired moisture basis,Ddet= density in lb/ft3(kg/m3) on an as-determined mois-ture basis, andMadj= % moisture, at the desi
16、red moisture basis, andMdet= % moisture, as determined on the density sample.5.2 Calculate the tons of coal in the stockpile using Eq 3:T 5D *Vt(3)where:T = total stockpile tons,D = mean of density samples in lb/ft3kg/m3 (from TestMethod D 6347/D 6347M),V = total volume of stockpile in ft3m3 (from T
17、est MethodD 6172), andt = 2000 lb/t (short ton) 1000 kg/Mg (metric tonne).6. Confidence Interval Calculation6.1 A measurement is stated as a quantity, plus or minussome confidence interval, at some level of significance. In thecase of volume, this translates to total volume (in ft3), plus orminus so
18、me tolerance factor (stated as percent of total volume),calculated at a significance level consistent with Annex A5 ofTest Method D 6347/D 6347M.6.2 The tolerance for the inventory results combines thetolerances, in %, of the density survey data and the volumetricdata according to Eq 4:C 5 =D21 A2(4
19、)where:C = combined tolerances of density and volume in %,D = tolerance of density test in percent (from Test MethodD 6347/D 6347M), andA = tolerance of volumetric survey in percent (from TestMethod D 6172).7. Report7.1 The minimum information to be reported is as follows:7.1.1 The owner(s) and loca
20、tion of the stockpile.7.1.2 The dates when the density and the volume weredetermined.7.1.3 Tons of coal in the stockpile as calculated by Eq 3.7.1.4 The density and volume values used in the calcula-tions.7.1.5 The moisture defining the basis on which the densitywas calculated.7.1.6 The confidence i
21、nterval in percent.8. Precision and Bias8.1 PrecisionThe precision of the result is given by Eq 4.8.2 BiasSince there is no acceptable reference method fordetermining the bias for the procedure for tonnage, bias has notbeen determined.9. Keywords9.1 density; stockpile; tonnage; tons; volumeASTM Inte
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25、ndards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D6542052
