ASTM D3302-05
(Test Method)Standard Test Method for Total Moisture in Coal
Standard Test Method for Total Moisture in Coal
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.
1.5 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:D3302–05
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 2. Referenced Documents
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1.1 This test method covers the measurement of the total 2.1 ASTM Standards:
moisture in coal as it exists at the site, at the time, and under D 121 Terminology of Coal and Coke
the conditions it is sampled. It is applicable to coals as mined, D 2013 Practice for Preparing Coal Samples for Analysis
processed, shipped, or used in normal commercial pursuits. It D 2234 Practice for Collection of a Gross Sample of Coal
is not applicable to coal-water slurries, sludges, or pulverized D 2961 Test Method for Single-Stage Total Moisture Less
products under 0.5-mm-diameter sieve size. It is applicable to than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve)
coals of all ranks within the recognized limitations imposed by Topsize
oxidation and decomposition characteristics of lower rank D 3173 Test Method for Moisture in theAnalysis Sample of
coals. Because of its empirical nature, strict adherence to basic Coal and Coke
principles and permissive procedures are required for valid D 5865 Test Method for Gross Calorific Value of Coal and
results (seeAppendix X1). This complete standard is available Coke
to producers, sellers, and consumers as a total moisture method
3. Terminology
when other procedures or modifications are not mutually
3.1 Definitions—For additional definitions of terms used in
agreed on.
1.2 Since coal can vary from extremely wet (water- this test method, refer to Terminology D 121.
3.2 Definitions of Terms Specific to This Standard:
saturated) to completely dry, special emphasis must be placed
on the sampling, sample preparation, and the moisture deter- 3.2.1 air drying—a process of partial drying of a coal
sample to bring it to near equilibrium with the atmosphere in
mination itself to ensure total reliability of measurement.
Therefore, this standard entails collection of the gross sample, theroominwhichfurtherreduction/divisionofthesampleisto
take place.
sample preparation, and the method of determination.
3.2.2 air-dry loss—the loss in weight, expressed as a
1.3 While it is recognized that such a standard may be
unwieldy for routine usage in commercial operations, it can percent, resulting from each air-drying operation.
3.2.3 easily oxidized coals—low-rank coals such as subbi-
provide a common base for agreement in cases of dispute or
arbitration. The complete standard is referred to as the referee tuminous or lignitic coals.
3.2.4 equilibrium—conditionreachedinairdryingwhenthe
method. Embodied in the standard is the commercial method
starting with the crushed and divided sample when the gross change in weight of the sample, under conditions of ambient
temperature and humidity, is no more than 0.1 %/h or 0.05 %/
sample is not too wet to crush and divide. See Test Methods
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D 2961 and D 3173 for other moisture methods. ⁄2 h.
3.2.5 residual moisture—that moisture remaining in the
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information sample after air drying.
3.2.6 total moisture—see Terminology D 121.
only.
1.5 This standard does not purport to address all of the
4. Summary of Test Method (See Fig. 1)
safety concerns, if any, associated with its use. It is the
4.1 This test method is based on the loss in weight of a coal
responsibility of the user of this standard to establish appro-
sampleinanairatmosphereunderrigidlycontrolledconditions
priate safety and health practices and determine the applica-
of temperature, time, and airflow.
bility of regulatory limitations prior to use.
4.2 Alternative Methods:
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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 Sept. 15, 2005. Published September 2005. Originally Standards volume information, refer to the standard’s Document Summary page on
e1
approved in 1974. Last previous edition approved in 2002 as D3302–02a . the ASTM website.
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D3302–05
FIG. 1 Total Moisture Determination on Gross Sample, Special Moisture Subsample, or on Cru
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