ASTM D5192-07
(Practice)Standard Practice for Collection of Coal Samples from Core
Standard Practice for Collection of Coal Samples from Core
SIGNIFICANCE AND USE
A properly collected sample that includes the total coal bed interval provides a sample that is a representative cross section of the coal bed at the point of sampling. Core samples are taken for subsequent testing needed for evaluation of coal quality and characterization for commercial evaluations, for planning of mining operations to maintain coal quality, for the determination of coal rank in accordance with Classification D 388, and for geologic coal resource studies.
Note 1—Because of the potential for lateral variability, a sample may not represent the quality of the coal bed at another sample point. The reliability of the data generated from core samples is dependent on the number and spacing of the sample points and the variability of the coal characteristics in a given area.
Moisture determined directly from a core sample shall be considered questionable in any core sample because of possible contamination from drilling fluids and groundwater. If a more representative estimate of the inherent moisture content of the core sample (with the exception of certain low-rank coals) is desired, the sample should be analyzed according to Test Method D 1412.
SCOPE
1.1 This practice describes procedures for collecting and handling a coal sample from a core recovered from a borehole.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation:D5192–07
Standard Practice for
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Collection of Coal Samples from Core
This standard is issued under the fixed designation D 5192; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 caves or washouts, n—zones of increased hole diam-
eter caused by rock fragments that fall from the walls of a
1.1 This practice describes procedures for collecting and
borehole and can block the hole or contaminate the cuttings
handling a coal sample from a core recovered from a borehole.
and which erode or abrade the sidewall of the borehole by the
1.2 The values stated in SI units are to be regarded as the
action of the drilling. These zones can affect the accuracy of
standard. The values given in parentheses are for information
certain geophysical logs (especially density). Corrections to
only.
other geophysical logs can be made if a caliper log is available.
1.3 This standard does not purport to address all of the
The most common causes of caves or washouts include soft or
safety concerns, if any, associated with its use. It is the
fractured lithologies, the presence of water-producing zones,
responsibility of the user of this standard to establish appro-
and the downhole pressure of the drilling medium (fluid or air)
priate safety and health practices and determine the applica-
thatoftencausesdifferentialerosionofvariousstratawithinthe
bility of regulatory limitations prior to use.
borehole.
2. Referenced Documents
3.1.3 concretion, n—in a geological sense, a mass of min-
2
eral matter found in rock of a composition different from its
2.1 ASTM Standards:
own and produced by deposition from aqueous solution in the
D 121 Terminology of Coal and Coke
rock.
D 388 Classification of Coals by Rank
3.1.4 core,n—indrilling,acylindricalsectionofrock(coal)
D 1412 Test Method for Equilibrium Moisture of Coal at 96
that is usually 5 to 10 cm in diameter, taken as part of the
to 97 Percent Relative Humidity and 30°C
interval penetrated by a core bit and brought to the surface for
D 2013 Practice for Preparing Coal Samples for Analysis
geologic examination, representative sampling, and laboratory
D 2796 Terminology Relating to Megascopic Description
analyses.
of Coal and Coal Seams and Microscopical Description
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3.1.5 core barrels, n—two nested tubes above the bit of a
and Analysis of Coal
coredrill,theouterrotatingwiththebit,theinnerreceivingand
D 4371 Test Method for Determining the Washability Char-
preserving a continuous section or core of the material pen-
acteristics of Coal
etrated.Thefollowingtwotypesofinnerbarrelsarecommonly
D 4596 Practice for Collection of Channel Samples of Coal
used.
in a Mine
3.1.5.1 split-tubebarrel,n—atypeofinnerbarrelconsisting
3. Terminology
oftwolongitudinalhalvesofpipeboundtogetherbyreinforced
tape at intervals along the barrel length that allows easy access
3.1 Definitions—For additional definitions of terms, refer to
to a relatively intact core (by cutting the tape). (This is the
Terminology D 121.
preferred barrel type for coal exploration, when available.)
3.1.1 borehole, n—the circular hole through soil and rock
3.1.5.2 solid-tube barrel, n—a type of inner barrel consist-
strata made by boring.
ing of a single solid-walled length of pipe in which removal of
the core is accomplished by mechanical or hydraulic pressure
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at one end of the pipe thus extruding the core onto a core tray.
This practice is under the jurisdiction of ASTM Committee D05 on Coal and
Coke and is the direct responsibility of Subcommittee D05.18 on Classification of
(Thecoreislikelytobelessintactthanwhenasplit-tubebarrel
Coals.
is used.)
Current edition approved Oct. 1, 2007. Published October 2007. Originally
e1 3.1.6 core sample, n—that part of a core of rock or coal
approved in 1991. Last previous edition approved in 1999 as D 5192 – 99(2004)
obtained so as to accurately represent a thickness of a unit
.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
penetrating by drilling.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3.1.7 geophysical log, n—a graphic record of the measured
Standards volume information, refer to the standard’s Document Summary page on
or computed physical characteristics of the rock section en-
the ASTM website.
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Withdrawn. countered in a borehole, plotted as a continuous function of
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D5192–07
depth. Measurements are made by a sonde, which contain
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