1、Designation:D 4702 03aStandard Guide forQuality Management of Mechanical Coal Sampling Systems1This standard is issued under the fixed designation D 4702;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide is applicable to cross-belt,falling stream,andauger sampling systems.1.2 Spacing of increments pertains to the kind of intervalbet
3、ween increments.Intervals can be defined in quantitativeterms,such as units of time or mass,or in terms of positionover the lot.1.2.1 Spacing of Increments for Cross-Belt and FallingStream SamplersCross-belt and falling stream type mechani-cal sampling systems take increments based on time,either at
4、fixed time intervals or at random times during a fixed timestrata.Some crosscut samplers can take increments based onequal mass of coal sampled as determined by scales.Thesections of this guide that pertain to cross-belt and fallingstream samplers describe procedures for only time-basedsampling syst
5、ems.This time-based inspection guideline willsatisfy most criteria for mass-based or combination mass-basedand time-based sampling systems.If there are items that are notcovered,the inspector should refer to the manufacturersliterature.1.2.2 Spacing of Increments for Auger SamplingThespacing of incr
6、ements collected by auger sampling systems isdefined in terms of position over the lot.1.3 It is essential that the inspector have the documentationlisted in Section 2 of this guide when conducting an inspection.1.4 The values stated in SI units are to be regarded as thestandard.The values given in
7、parentheses are for informationonly.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 limitat
8、ions prior to use.For a specifichazard statement,see Section 5.2.Referenced Documents2.1 ASTM Standards:2D 121 Terminology of Coal and CokeD 2013 Practice of Preparing Coal Samples for AnalysisD 2234 Practice for Collection of a Gross Sample of CoalD 4749 Test Method for Performing the Sieve Analysi
9、s ofCoal and Designating Coal SizeD 4916 Practice for Mechanical Auger Sampling3.Terminology3.1 DefinitionsDefinitions applicable to this guide arelisted in Terminology D 121,Practices D 2234 and D 4916,and Practice D 2013.4.Significance and Use4.1 This guide addresses quality assurance criteria for
10、 op-eration of a mechanical coal-sampling system in accordancewith Practice D 2234,Practice D 2013,and Practice D 4916.Itprovides recommendations for performance monitoring,in-spection,and maintenance,which are necessary in maintaininga sampling systems capability to consistently obtain a repre-sent
11、ative sample.5.Hazards5.1 PrecautionsIn addition to other precautions,person-nel visiting facilities for observation of mechanical samplingsystem performance should immediately upon arrival report tothe facility management to inform them of their presence andthe purpose of their visit.The inspector
12、should ask for1This guide 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 Dec.1,2003.Published December 2003.Originallyapproved in 1987.Last previous edition approved in 1997 as D 4702 03.2Fo
13、r 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,100 Barr Harbor Drive,PO Box C700,West
14、Conshohocken,PA 19428-2959,United States.drawings,specifications,and instructions on the applicablesafety practices and regulations to be followed on the site.6.Assessing the Organization and Planning of SamplingOperations6.1 It is recommended that inspection personnel meet withthe appropriate perso
15、nnel responsible for the mechanical sam-pling system,on all visits,to discuss the organization andplanning of sampling operations.ASTM standards provide forthe use of various options.Examples and references are givenin 6.1.1 and 6.1.2 as follows:6.1.1 Cross-Belt and Falling Stream SamplersThe num-be
16、r of primary increments for the gross sample collected bycross-belt and falling stream systems can be determined fromsections 8.1.1.4 and 8.1.1.5 of Practice D 2234.6.1.2 Auger SamplingConsiderations for the number ofauger increments per lot and per vehicle are discussed in theConsideration for Number ofAuger Increments section(6.3)ofPractice D 4916.6.2 Inspection personnel should refer to the sections ofPractice D 2234 and Practice D 4916 referenced in 6.2.1 and6.2.2 of this guide when assessin
