ASTM_D_5192_-_09_2015.pdf

Designation:D519209(Reapproved 2015)Standard Practice forCollection of Coal Samples from Core1This standard is issued under the fixed designation D5192;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 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes procedures for collecting andhandling a coal sample from a core recovered from a borehole.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.Referenced Documents2.1 ASTM Standards:2D121 Terminology of Coal and CokeD388 Classification of Coals by RankD1412 Test Method for Equilibrium Moisture of Coal at 96to 97 Percent Relative Humidity and 30CD2013 Practice for Preparing Coal Samples for AnalysisD2796 Terminology for Megascopic Description of Coaland Coal Seams and Microscopical Description andAnalysis of Coal(Withdrawn 1995)3D4371 Test Method for Determining the Washability Char-acteristics of CoalD4596 Practice for Collection of Channel Samples of Coalin a Mine3.Terminology3.1 Definitions:3.1.1 For additional definitions of terms,refer to Terminol-ogy D121.3.1.2 borehole,nthe circular hole through soil and rockstrata made by boring.3.1.3 caves or washouts,nzones of increased hole diam-eter caused by rock fragments that fall from the walls of aborehole and can block the hole or contaminate the cuttingsand which erode or abrade the sidewall of the borehole by theaction of the drilling.These zones can affect the accuracy ofcertain geophysical logs(especially density).Corrections toother geophysical logs can be made if a caliper log is available.The most common causes of caves or washouts include soft orfractured lithologies,the presence of water-producing zones,and the downhole pressure of the drilling medium(fluid or air)that often causes differential erosion of various strata within theborehole.3.1.4 concretion,nin a geological sense,a mass of min-eral matter found in rock of a composition different from itsown and produced by deposition from aqueous solution in therock.3.1.5 core,nin drilling,a cylindrical section of rock(coal)that is usually 5 to 10 cm in diameter,taken as part of theinterval penetrated by a core bit and brought to the surface forgeologic examination,representative sampling,and laboratoryanalyses.3.1.6 core barrels,ntwo nested tubes above the bit of acore drill,the outer rotating with the bit,the inner receiving andpreserving a continuous section or core of the material pen-etrated.The following two types of inner barrels are commonlyused.3.1.6.1 split-tube barrel,na type of inner barrel consistingof two longitudinal halves of pipe bound together by reinforcedtape at intervals along the barrel length that allows easy accessto a relatively intact core(by cutting the tape).(This is thepreferred barrel type for coal exploration,when available.)3.1.6.2 solid-tube barrel,na type of inner barrel consist-ing of a single solid-walled length of pipe in which removal ofthe core is accomplished by mechanical or hydraulic pressureat one end of the pipe thus extruding the core onto a core tray.(The core is likely to be less intact than when a split-tube barrelis used.)3.1.7 core sample,nthat part of a core of rock or coalobtained so as to accurately represent a thickness of a unitpenetrating by drilling.1This practice is under the jurisdiction of ASTM Committee D05 on Coal andCoke and is the direct responsibility of Subcommittee D05.18 on Classification ofCoals.Current edition approved Sept.1,2015.Published September 2015.Originallyapproved in 1991.Last previous edition approved in 2009 as D5192 09.DOI:10.1520/D5192-09R15.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.8 geophysical log,na graphic record of the measuredor computed physical characteristics of the rock section en-countered in a borehole,plotted as a continuous function ofdepth.Measurements are made by a sonde,which contains thedetectors,as it is withdrawn from the borehole by a wire line.Several measurements are usually made simultaneously,andthe resulting curves are displayed side by side on the commondepth scale.A common suite of logs us