1、Designation:D 4916 04Standard Practice forMechanical Auger Sampling1This standard is issued under the fixed designation D 4916;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 parentheses indicate
2、s the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes procedures for the collection ofan increment,partial sample,or gross sample of material usingmechanical augers.Reduction and division of the mat
3、erial bymechanical equipment at the auger is also covered.Furthermanual or mechanical reduction or division of the materialelsewhere shall be performed in accordance with MethodD 2013.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informat
4、iononly.1.3 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.2.Referenc
5、ed Documents2.1 ASTM Standards:2D 2013 Practice for Preparing Coal Samples for AnalysisD 2234/D 2234M Practice for Collection of a Gross Sampleof CoalD 4749 Method for Performing the Sieve Analysis of Coaland Designating Coal SizeE 177 Practice for Use of the Terms Precision and Bias inASTM Test Met
6、hods3.Terminology3.1 Definitions:3.1.1 accuracy:3.1.1.1 generally,a term used to indicate the reliability of asample,a measurement,or an observation.3.1.1.2 specifically,a measure of closeness of agreementbetween an experimental result and the true value.An exampleis the observed and true sulfur con
7、tent of a coal consignment.This measurement is affected by chance errors as well as bybias.3.1.2 auger incrementthe retained portion of one extrac-tion operation of the auger.3.1.3 consignmenta discrete amount of coal,such as ashipment,a car load,a unit train,or a days production.Aconsignment may in
8、clude more than one lot of coal and maycorrespond to a specific period of time,such as a samplingperiod or a billing period.3.1.4 precisiona term used to indicate the capability of aperson,an instrument,or a method to obtain reproducibleresults;specifically,a measure of the chance error as expressed
9、by the variance,standard error,or a multiple of the standarderror(see Practice E 177).3.1.5 unbiased sample(representative sample)a samplefree of bias.4.Summary of Practice4.1 A sample of coal is extracted from a stationary loadcontained within a railcar(s),truck(s),or barge(s)by insertingan auger i
10、nto the vehicle in a vertical manner to extract acolumnar sample of coal from the vehicle.The coal collectedby the auger is then placed into sealed containers for storage oris processed by additional sampling equipment,for example,asecondary sampler or crusher.The processed auger incrementsproduced
11、by these on-line components should be placed intosealed containers for future laboratory analysis.5.Significance and Use5.1 Auger sampling systems can be used to extract samplesfrom trucks,railcars,barges,or static compacted stockpileswhere the use of a full-stream mechanical sampling systemmay be i
12、mpractical.The samples obtained from these systemscan be used to establish the materials commercial value orconstituents for quality control purposes at the shipping orreceiving location of the interested parties in the transaction.The utilization of an auger system and procedures for collect-ing co
13、al samples for subsequent analysis should be agreed1This 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 April 1,2004.Published April 2004.Originallyapproved in 1989.Last previous ed
14、ition approved in 1997 as D 4916 97.2For 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.1Copyright ASTM International,
15、100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.upon by all parties concerned.Compacted stockpiles should beno higher than the length of the auger sampler.Otherwise,thedeeper areas of the stockpile cannot be sampled.6.Organization and Planning of Sampling Operations6.
16、1 General ConsiderationsMechanical auger sampling isdesignated as Condition D,Stationary Coal Sampling.Whenusing augers to sample,the material taken may only berepresentative to the depth sampled.In addition,the parameterssuch as top size,degree of preparation,degree of materialsegregation,and pattern of auger placement should also beconsidered.6.2 Consideration of Top SizeDesigns of mechanicalsampling augers vary from high-powered augers with cutterbits drilling through the coal to be sampled,t
