ASTM D7569/D7569M-24
(Practice)Standard Practice for Determination of Gas in Coal—Direct Desorption Method
Standard Practice for Determination of Gas in Coal—Direct Desorption Method
SIGNIFICANCE AND USE
5.1 Canister desorption is a widely used technique to measure the gas in coal. The gas level data when normalized to volume/mass and multiplied by coal mass is used to estimate the gas volume in place in an area around the cored well.
SCOPE
1.1 This practice describes methods for the direct determination of the gas in coal by desorption using samples obtained by drill coring methods from the surface. It sets out guidelines for the equipment construction, sample preparation and testing procedure, and method of calculation.
1.2 Indirect methods for the determination of the gas in coal (not covered in this practice) are based on either the gas absorption characteristics of coal under a given pressure and temperature condition or other empirical data that relate the gas in coal to such other parameters as coal rank, depth of cover, or gas emission rate.
1.3 This practice covers the following two direct methods, which vary only in the time allowed for the gas to desorb from the core, or sidewall core, before final crushing:
1.3.1 The slow desorption method in which volumetric readings of gas volume are taken frequently (for example, every 10 min to 15 min) during the first few hours, followed by hourly measurements for several hours, and then measurements on 24-h intervals until no or very little gas is being desorbed for an extended period of time.
1.3.2 The fast desorption method in which after initial desorbed gas measurements to obtain data for lost gas calculations are taken, the canister is opened and the sample is transferred to the coal crusher. The remaining gas volume is measured on a crushed sample.
1.4 This practice is confined to the direct method using core, or sidewall core obtained from drilling. The practice can be applied to drill cuttings samples; however, the use of cuttings is not recommended because the results may be misleading and are difficult to compare to the results obtained from core desorption. The interpretation of the results does not fall within the scope of the practice.
1.5 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7569/D7569M − 24
Standard Practice for
1
Determination of Gas in Coal—Direct Desorption Method
This standard is issued under the fixed designation D7569/D7569M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope lents; therefore, to ensure conformance with the standard, each
system shall be used independently of the other, and values
1.1 This practice describes methods for the direct determi-
from the two systems shall not be combined.
nation of the gas in coal by desorption using samples obtained
by drill coring methods from the surface. It sets out guidelines
1.6 This standard does not purport to address all of the
for the equipment construction, sample preparation and testing
safety concerns, if any, associated with its use. It is the
procedure, and method of calculation.
responsibility of the user of this standard to establish appro-
1.2 Indirect methods for the determination of the gas in coal priate safety, health, and environmental practices and deter-
(not covered in this practice) are based on either the gas
mine the applicability of regulatory limitations prior to use.
absorption characteristics of coal under a given pressure and
1.7 This international standard was developed in accor-
temperature condition or other empirical data that relate the gas
dance with internationally recognized principles on standard-
in coal to such other parameters as coal rank, depth of cover, or
ization established in the Decision on Principles for the
gas emission rate.
Development of International Standards, Guides and Recom-
1.3 This practice covers the following two direct methods,
mendations issued by the World Trade Organization Technical
which vary only in the time allowed for the gas to desorb from
Barriers to Trade (TBT) Committee.
the core, or sidewall core, before final crushing:
1.3.1 The slow desorption method in which volumetric
2. Referenced Documents
readings of gas volume are taken frequently (for example,
2
2.1 ASTM Standards:
every 10 min to 15 min) during the first few hours, followed by
D121 Terminology of Coal and Coke
hourly measurements for several hours, and then measure-
D167 Test Method for Apparent and True Specific Gravity
ments on 24-h intervals until no or very little gas is being
and Porosity of Lump Coke
desorbed for an extended period of time.
D1412 Test Method for Equilibrium Moisture of Coal at 96
1.3.2 The fast desorption method in which after initial
desorbed gas measurements to obtain data for lost gas calcu- to 97 Percent Relative Humidity and 30 °C
lations are taken, the canister is opened and the sample is D2799 Test Method for Microscopical Determination of the
transferred to the coal crusher. The remaining gas volume is
Maceral Composition of Coal
measured on a crushed sample.
D3172 Practice for Proximate Analysis of Coal and Coke
D3173 Test Method for Moisture in the Analysis Sample of
1.4 This practice is confined to the direct method using core,
Coal and Coke
or sidewall core obtained from drilling. The practice can be
D3174 Test Method for Ash in the Analysis Sample of Coal
applied to drill cuttings samples; however, the use of cuttings
and Coke from Coal
is not recommended because the results may be misleading and
are difficult to compare to the results obtained from core D3176 Practice for Ultimate Analysis of Coal and Coke
desorption. The interpretation of the results does not fall within D3180 Practice for Calculating Coal and Coke Analyses
the scope of the practice.
from As-Determined to Different Bases
D3302 Test Method for Total Moisture in Coal
1.5 Units—The values stated in either SI units or inch-
D5192 Practice for Collection of Coal Samples from Core
pound units are to be regarded separately as standard. The
E1272 Specification for Laboratory Glass Graduated Cylin-
values stated in each system are not necessarily exact equiva-
ders
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and
Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
2
Analysis. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2024. Published April 2024. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2010. Last previous edition approved in 2023 as D7569 – 10 (2023). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D7569_
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7569/D7569M − 10 (Reapproved 2023) D7569/D7569M − 24
Standard Practice for
Determination of Gas Content of in Coal—Direct Desorption
1
Method
This standard is issued under the fixed designation D7569/D7569M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice describes methods for the direct determination of the gas content of in coal by desorption using samples obtained
by drill coring methods from the surface. It sets out guidelines for the equipment construction, sample preparation and testing
procedure, and method of calculation.
1.2 Indirect methods for the determination of the gas content of in coal (not covered in this practice) are based on either the gas
absorption characteristics of coal under a given pressure and temperature condition or other empirical data that relate the gas
content of in coal to such other parameters as coal rank, depth of cover, or gas emission rate.
1.3 This practice covers the following two direct methods, which vary only in the time allowed for the gas to desorb from the core,
or sidewall core, before final crushing:
1.3.1 The slow desorption method in which volumetric readings of gas contentvolume are taken frequently (for example, every
10 min to 15 min) during the first few hours, followed by hourly measurements for several hours, and then measurements on 24-h
intervals until no or very little gas is being desorbed for an extended period of time.
1.3.2 The fast desorption method in which after initial desorbed gas measurements to obtain data for lost gas calculations are
taken, the canister is opened and the sample is transferred to the coal crusher. The remaining gas volume is measured on a crushed
sample.
1.4 This practice is confined to the direct method using core, or sidewall core obtained from drilling. The practice can be applied
to drill cuttings samples; however, the use of cuttings is not recommended because the results may be misleading and are difficult
to compare to the results obtained from core desorption. The interpretation of the results does not fall within the scope of the
practice.
1.5 Units—The values stated in either SI units or inch-pound units are to be regarded separately as the standard. The values stated
in each system may not beare not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system
shall be used independently of the other. Combiningother, and values from the two systems may result in nonconformance with
the standard.shall not be combined.
1.6 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of Analysis.
Current edition approved Dec. 1, 2023April 1, 2024. Published December 2023April 2024. Originally approved in 2010. Last previous edition approved in 20152023 as
ɛ1
D7569 – 10 (2015)(2023). . DOI: 10.1520/D7569_D7569-10R23.10.1520/D7569_D7569M-24.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7569/D7569M − 24
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D121 Terminology of Coal and Coke
D167 Test Method for Apparent and True Specific Gravity and Porosity of Lump Coke
D1412 Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30 °C
D2799 Test Method for Microscopical Determination of the Maceral Composition of Coal
D3172 Practice for Proximate Analysis of Coal and Coke
D3173 Test Method for Moisture in the Analysis Sample of Coal and Coke
D3174 Test Method for Ash in the Analysis Sample of Coal and Coke from Coal
...
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