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ASTM D1412-07

(Test Method)

Standard Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30°C

Standard Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30°C

SIGNIFICANCE AND USE
This test method affords a means of estimating the bed moisture of either coal that is wet and shows visible surface moisture or coal that may have lost some moisture. It may be used for estimating the surface, or extraneous moisture of wet coal, such moisture being the difference between the total moisture as determined by Test Method D 3302 and the equilibrium moisture.
When samples are collected in conformity with Classification D 388, the equilibrium moisture is considered to be equal to bed moisture with the exception of some low rank coals that yield equilibrium moisture values below bed moisture.
3.3 The results obtained by this test method are sensitive to many influences, and therefore, raw (uncorrected) equilibrium moisture data may be of limited value in and of themselves. When working with low rank coals, the results yielded by this test method require critical assessments. It is recommended that the procedure outlined in the Appendix X1 be applied, and the results corrected before use in situations where a more reliable estimation inherent or bed moisture for low rank coals is required. The Appendix also provides useful quality assurance information which is applicable to coals of all ranks.
SCOPE
1.1 This test method covers determination of the equilibrium moisture of coal in an atmosphere over a saturated solution of potassium sulfate at 30C.Note 1
For information concerning the experimental work on which this test method is based, see ().
1.2 &si-value;
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.

General Information

Status
Historical
Publication Date
30-Sep-2007
ICS
73.040 - Coals
Technical Committee
D05 - Coal and Coke
Drafting Committee
D05.21 - Methods of Analysis
Current Stage
Ref Project

Relations

Replaces
ASTM D1412-04 - Standard Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30°C
Effective Date
01-Oct-2007
Replaced By
ASTM D1412/D1412M-15 - Standard Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30°C
Effective Date
01-Sep-2015
Referred By
ASTM D121-15 - Standard Terminology of Coal and Coke
Effective Date
01-Oct-2007
Referred By
ASTM D7569/D7569M-10(2015)e1 - Standard Practice for Determination of Gas Content of Coal—Direct Desorption Method
Effective Date
01-Oct-2007
Referred By
ASTM D3180-15 - Standard Practice for Calculating Coal and Coke Analyses from As-Determined to Different Bases
Effective Date
01-Oct-2007
Referred By
ASTM D5192/D5192M-22 - Standard Practice for Collection of Coal Samples from Core
Effective Date
01-Oct-2007

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ASTM D1412-07 - Standard Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30°CASTM D1412-07 - Standard Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30°C
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ASTM D1412-07 - Standard Test Method for Equilibrium Moisture of Coal at 96 to 97 Percent Relative Humidity and 30°C
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D1412 − 07
StandardTest Method for
Equilibrium Moisture of Coal at 96 to 97 Percent Relative
1
Humidity and 30°C
This standard is issued under the fixed designation D1412; 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 3. Significance and Use
3.1 This test method affords a means of estimating the bed
1.1 This test method covers determination of the equilib-
moisture of either coal that is wet and shows visible surface
rium moisture of coal in an atmosphere over a saturated
moisture or coal that may have lost some moisture. It may be
solution of potassium sulfate at 30°C.
used for estimating the surface, or extraneous moisture of wet
NOTE 1—For information concerning the experimental work on which
coal, such moisture being the difference between the total
2
this test method is based, see (1-5).
moisture as determined by Test Method D3302 and the
equilibrium moisture.
1.2 The values stated in SI units are to be regarded as
standard. The values given in parentheses are for information
3.2 When samples are collected in conformity with Classi-
only. fication D388, the equilibrium moisture is considered to be
equal to bed moisture with the exception of some low rank
1.3 This standard does not purport to address all of the
coals that yield equilibrium moisture values below bed mois-
safety concerns, if any, associated with its use. It is the
ture.
responsibility of the user of this standard to establish appro-
3.3 The results obtained by this test method are sensitive to
priate safety and health practices and determine the applica-
many influences, and therefore, raw (uncorrected) equilibrium
bility of regulatory limitations prior to use.
moisture data may be of limited value in and of themselves.
When working with low rank coals, the results yielded by this
2. Referenced Documents
test method require critical assessments. It is recommended
3
2.1 ASTM Standards:
that the procedure outlined in the Appendix X1 be applied, and
D121 Terminology of Coal and Coke
the results corrected before use in situations where a more
D388 Classification of Coals by Rank
reliable estimation inherent or bed moisture for low rank coals
D2013 Practice for Preparing Coal Samples for Analysis
is required. The Appendix also provides useful quality assur-
D2234/D2234M Practice for Collection of a Gross Sample
ance information which is applicable to coals of all ranks.
of Coal
4. Apparatus
D3172 Practice for Proximate Analysis of Coal and Coke
4.1 Water Bath or Insulated Air Cabinet—The bath or
D3173 Test Method for Moisture in the Analysis Sample of
cabinet shall be of sufficient size to accommodate several
Coal and Coke
vacuum-type desiccators, and shall be provided with a tem-
D3302 Test Method for Total Moisture in Coal
perature regulator to maintain a uniform temperature of 30.0 6
D4596 Practice for Collection of Channel Samples of Coal
0.2°C.
in a Mine
4.2 Moisture Oven—The oven shall be so constructed as to
have a uniform temperature in all parts and a minimum of air
space. It may be of the type shown in theApparatus section of
1
This test method is under the jurisdiction of ASTM Committee D05 on Coal
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of Test Method D3173. Provision shall be made for renewing the
Analysis.
air (or, if desired, dry oxygen-free nitrogen for subbituminous
Current edition approved Oct. 1, 2007. Published October 2007. Originally
and lignitic coals) in the oven at a rate of two times per minute,
approved in 1956 . Last previous edition approved in 2004 as D1412 – 04. DOI:
with the air dried as defined in 5.1.
10.1520/D1412-07.
2
The boldface numbers in parentheses refer to a list of references at the end of
4.3 Mechanical Vacuum Pump.
this standard.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.4 Crusher, laboratory, coffee-mill type.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.5 Sieve, 203-mm (8-in.) diameter, with 1.18-mm (No. 16)
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. openings.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D1412 − 07
4.6 Shaking Machine. 6. Technical Hazards
4.7 Desiccator—Small vacuum-type desiccator, 160 mm in 6.1 In collecting, containing, handling, reducing, and divid-
ing the gross moisture sample, all operations must be done
diameter (see Fig. 1).
expeditiously and in a manner that
...

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5.1 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 D388, and for geologic coal resource studies.  
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1.2.2 Group B includes all other coals. Unknown coals are to be considered under Group B.  
1.2.3 Group A allows smaller weight laboratory samples to be retained than Group B. These lower weights may be used for particular coals if they have been shown, by using the procedures of A1.2, to give a sample preparation and analysis variance which is no more than 20 % of the total analysis variance.  
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4.1 Briquets of granular bituminous coals and anthracite prepared in accordance with the laboratory procedures of this practice will have flat, scratch-free surfaces suitable for examination with a microscope using reflected light illumination. The polished surfaces of briquettes prepared by this practice will contain particles representative of the original gross sample.  
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Standard Test Method for Bulk Density of Crushed Bituminous Coal

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3.1 This test method concerns the compaction of crushed coal to determine either its compacted or uncompacted bulk density, for purposes such as charging coke ovens.
SCOPE
1.1 This test method covers two procedures for determining the bulk density of crushed coal less than 37.5 mm [1.5 in.] in size, such as is charged into coke ovens, as follows:  
1.1.1 Procedure A—The cone procedure for determining an uncompacted bulk density.
1.1.1.1 Standard Method—Procedure employs the use of a 115 mm [4.5 in.] chute opening and a measuring box having dimensions of 305 mm x 305 mm x 305 mm [12.0 in. x 12.0 in. x 12.0 in.].
1.1.1.2 Alternate Method—Procedure employs the use of a 203 mm [8.0 in.] chute opening and a measuring box having dimensions of 203 mm x 203 mm x 305 mm [8.0 in. x 8.0 in. x 12.0 in.] for coals with a total moisture greater than 7 %.  
1.1.2 Procedure B—The dropped-coal procedure for determining a compacted bulk density, comparable to actual bulk densities attained in coke ovens.  
1.2 This test method is not applicable to the testing of powdered coal as used in boiler plants, nor to the determination of the bulk density of coal in storage piles.  
1.3 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.  
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