ASTM D3302-07a
(Test Method)Standard Test Method for Total Moisture in Coal
Standard Test Method for Total Moisture in Coal
SIGNIFICANCE AND USE
The collection and treatment of the sample as specified for the referee method is intended for the express purpose of determining the total moisture in coal. The standard is available to producers, sellers, and consumers as a method of determination when other techniques or modifications are not mutually agreed upon.
The commercial method, which determines total moisture content of the crushed and divided sample, is designated as the method for total moisture for routine commercial practice.
SCOPE
1.1 This test method covers the measurement of the total moisture in coal as it exists at the site, at the time, and under the conditions it is sampled. It is applicable to coals as mined, processed, shipped, or used in normal commercial pursuits. It is not applicable to coal-water slurries, sludges, or pulverized products under 0.5-mm-diameter sieve size. It is applicable to coals of all ranks within the recognized limitations imposed by oxidation and decomposition characteristics of lower rank coals. Because of its empirical nature, strict adherence to basic principles and permissive procedures are required for valid results (see Appendix X1). This complete standard is available to producers, sellers, and consumers as a total moisture method when other procedures or modifications are not mutually agreed on.
1.2 Since coal can vary from extremely wet (water-saturated) to completely dry, special emphasis must be placed on the sampling, sample preparation, and the moisture determination itself to ensure total reliability of measurement. Therefore, this standard entails collection of the gross sample, sample preparation, and the method of determination.
1.3 While it is recognized that such a standard may be unwieldy for routine usage in commercial operations, it can provide a common base for agreement in cases of dispute or arbitration. The complete standard is referred to as the referee method. Embodied in the standard is the commercial method starting with the crushed and divided sample when the gross sample is not too wet to crush and divide. See Test Methods D 2961 and D 3173 for other moisture methods.
1.4 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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Designation:D3302–07a
Standard Test Method for
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Total Moisture in Coal
This standard is issued under the fixed designation D 3302; 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 priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This test method covers the measurement of the total
moisture in coal as it exists at the site, at the time, and under
2. Referenced Documents
the conditions it is sampled. It is applicable to coals as mined,
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2.1 ASTM Standards:
processed, shipped, or used in normal commercial pursuits. It
D 121 Terminology of Coal and Coke
is not applicable to coal-water slurries, sludges, or pulverized
D 388 Classification of Coals by Rank
products under 0.5-mm-diameter sieve size. It is applicable to
D 2013 Practice for Preparing Coal Samples for Analysis
coals of all ranks within the recognized limitations imposed by
D 2234/D 2234M PracticeforCollectionofaGrossSample
oxidation and decomposition characteristics of lower rank
of Coal
coals. Because of its empirical nature, strict adherence to basic
D 2961 Test Method for Single-Stage Total Moisture Less
principles and permissive procedures are required for valid
than 15 % in Coal Reduced to 2.36-mm (No. 8 Sieve)
results (seeAppendix X1). This complete standard is available
Topsize
to producers, sellers, and consumers as a total moisture method
D 3173 Test Method for Moisture in theAnalysis Sample of
when other procedures or modifications are not mutually
Coal and Coke
agreed on.
D 5865 Test Method for Gross Calorific Value of Coal and
1.2 Since coal can vary from extremely wet (water-
Coke
saturated) to completely dry, special emphasis must be placed
on the sampling, sample preparation, and the moisture deter-
3. Terminology
mination itself to ensure total reliability of measurement.
3.1 Definitions—For additional definitions of terms used in
Therefore, this standard entails collection of the gross sample,
this test method, refer to Terminology D 121.
sample preparation, and the method of determination.
3.2 Definitions of Terms Specific to This Standard:
1.3 While it is recognized that such a standard may be
3.2.1 air drying—a process of partial drying of a coal
unwieldy for routine usage in commercial operations, it can
sample to bring it to near equilibrium with the atmosphere in
provide a common base for agreement in cases of dispute or
theroominwhichfurtherreduction/divisionofthesampleisto
arbitration. The complete standard is referred to as the referee
take place.
method. Embodied in the standard is the commercial method
3.2.2 air-dry loss—the loss in weight, expressed as a
starting with the crushed and divided sample when the gross
percent, resulting from each air-drying operation.
sample is not too wet to crush and divide. See Test Methods
3.2.3 easily oxidized coals—low-rank coals such as subbi-
D 2961 and D 3173 for other moisture methods.
tuminous or lignitic coals.
1.4 The values stated in SI units are to be regarded as the
3.2.4 equilibrium—conditionreachedinairdryingwhenthe
standard. The values given in parentheses are for information
change in weight of the sample, under conditions of ambient
only.
temperature and humidity, is no more than 0.1 %/h or 0.05 %/
1.5 This standard does not purport to address all of the
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⁄2 h.
safety concerns, if any, associated with its use. It is the
3.2.5 residual moisture—that moisture remaining in the
responsibility of the user of this standard to establish appro-
sample after air drying.
3.2.6 total moisture—see Terminology D 121.
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This test method is under the jurisdiction of ASTM Committee D05 on Coal
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and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Analysis. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Oct. 1, 2007. Published October 2007. Originally Standards volume information, refer to the standard’s Document Summary page on
e1
approved in 1974. Last previous edition approved in 2007 as D 3302–07 . the ASTM website.
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D3302–07a
FIG. 1 Total Moisture Determination on Gross Sample, Special Moisture Subsample, or on Crushed and Divided Sample
4. Summary of Test Method (See Fig. 1) 4.2.1 Referee Method, which may be used in cases of
dispute or arbitration.The gross moisture sample is air dried t
...
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