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ASTM D2961-95a

(Test Method)

Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve)Topsize

Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve)Topsize

SCOPE
1.1 This test method covers a single-stage procedure for the determination of total moisture less than 15 % in coal reduced to 2.36- mm (No. 8 sieve) topsize. This test method is for determination of total moisture only. Materials subjected to this test shall not be used in the determination of other test parameters. It is recognized that the conditions of the test can increase the potential for significant oxidation effects on some coals. If the oxidation potential is of concern, the use of this single-stage method shall involve prior agreement between the parties involved. This test method shall not be construed as the referee standard test method for total moisture. For referee purposes, users of this test method are referred to Test Method D3302 for moisture determination methods which are not as susceptible to oxidation effects.
1.2 Statistical analysis of data from several sources indicates that at a 95% confidence level, there is statistically no significant difference between the mean value of the results obtained by D2961 and D3302 (that is, no bias is detected between the two methods at the 95% confidence level) for moisture levels between 1.4% and 15.8%. These two test methods were not compared in this study for some ranks of coal including lignite and anthracite. Supporting data has been filed at ASTM Headquarters and may be obtained by requesting Research Report D05-1024.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 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
09-Jun-2001
ICS
75.160.10 - Solid fuels
Technical Committee
D05 - Coal and Coke
Drafting Committee
D05.21 - Methods of Analysis
Current Stage
Ref Project

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ASTM D2961-95a - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve)TopsizeASTM D2961-95a - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve)Topsize
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ASTM D2961-95a - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve)Topsize
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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:D2961–95a
Standard Test Method for
Total Moisture in Coal Reduced to 2.36-mm (No. 8) Mesh
1
Top Sieve Size (Limited-Purpose Method)
This standard is issued under the fixed designation D 2961; 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 (ε) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers a single-stage procedure for the 4.1 The measurement of total moisture is required to deter-
determination of total moisture in coal reduced to 2.36- mm mine whether coal meets commercial or environmental speci-
mesh (No. 8). It is recognized that the conditions of the test can fications, or both. Within the limitations prescribed in the
increase the potential for significant oxidation effects. Materi- scope, this test method describes a procedure for determination
als subjected to this test shall not be used in the determination of total moisture that requires less time than the procedures
ofothertestparameters.Iftheoxidationpotentialisofconcern, described in Test Method D 3302.
the use of this single-stage method shall involve prior agree-
5. Apparatus
ment between the parties involved. This test method shall not
be construed as the standard test method for total moisture. For 5.1 Drying Pans, noncorrodible, stable at the temperature
used, and of such size that the sample can be spread to a depth
referee purposes, users of this test method are referred to Test
Method D 3302 for moisture determination methods which are of not more than 25 mm (1 in.).
5.1.1 The pan size may be varied to suit the size of the
not as susceptible to oxidation effects.
sample and the oven. The height of the sides shall be no more
NOTE 1—If the oxidation potential is of concern, the use of this
1
than 40 mm (1 ⁄2 in.) so that air is not restricted in passing over
single-stage method should involve prior agreement between the parties
the coal.
involved.
5.2 Drying Oven, forced air-type capable of maintaining a
1.2 The values stated in SI units are to be regarded as the
temperature of 107 6 3°C and constructed to provide for a
standard.
continuous air flow to all parts of the oven.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Sampling
responsibility of the user of this standard to establish appro-
6.1 The sample shall be prepared according to Test Method
priate safety and health practices and determine the applica-
D 2013 except that the 500 g portion can be further subdivided
bility of regulatory limitations prior to use.
to 125 g.
6.2 That portion of the sample used for the moisture
2. Referenced Documents
determination shall have a minimum weight of 125 g.
2.1 ASTM Standards:
D 2013 Test Method of Preparing Coal Samples for Analy-
7. Procedure
2
sis
7.1 Weigh the empty drying pan. Record the mass in grams
2
D 3302 Test Method for Total Moisture in Coal
as W . Transfer the sample from the sample container to the
1
drying pan. Distribute the sample uniformly over the pan. Do
3. Summary of Test Method
not exceed a depth of 25 mm (1 in.). Place the empty sample
3.1 Moisture is determined by establishing the weight loss
container in the drying pan.Weigh the drying pan, coal sample,
of the coal sample by drying in an oven with forced-air
and empty sample container. Record the mass in grams as W .
3
circulation.
7.2 Place the pan, sample, and empty sample container in
the oven at a temperature of 107 6 3°C. Maintain the air flow
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD-5onCoaland to provide continuous introduction of air while ensuring that
1
Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
fine particles are not elutriated. Dry for 1 ⁄2 h, remove from the
Analysis.
oven, and weigh immediately. Record the mass.
Current edition approved Oct. 10, 1995. Published December 1995. Originally
published as D 2961 – 71 T. Last previous edition D 2961 – 95.
2
Annual Book of ASTM Standards, Vol 05.05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D2961–95a
1
7.3 Return to the oven for an additional ⁄2 h, remove, and
W = weight of coal plus pan plus sample container wet,
3
1
weigh. Record the mass. Repeat the drying at ⁄2-h intervals
and
1
until the change in mass for the ⁄2-h period is less than 0.05 %
W = weight of coal plus pan plus sample container after
4
of the original mass of the coal sample. Record the minimum
drying.
mass of the dried pan, sample, and container as W .
4
7.4 Remove any r
...

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