ASTM D2961-11
(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
SIGNIFICANCE AND USE
The measurement of total moisture is required to determine whether coal meets commercial or environmental specifications, or both. Within the limitations prescribed in the scope, this test method describes a procedure for determination of total moisture that requires less time than the procedures described in Test Method D 3302.
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 D 3302 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 D 2961 and D 3302 (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.
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
Relations
Buy Standard
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D2961 − 11
Standard Test Method for
Single-Stage Total Moisture Less than 15 % in Coal
1
Reduced to 2.36-mm (No. 8 Sieve) Topsize
This standard is issued under the fixed designation D2961; 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 2. Referenced Documents
2
1.1 This test method covers a single-stage procedure for the 2.1 ASTM Standards:
determination of total moisture less than 15 % in coal reduced D121 Terminology of Coal and Coke
to 2.36- mm (No. 8 sieve) topsize. This test method is for D2013 Practice for Preparing Coal Samples for Analysis
determinationoftotalmoistureonly.Materialssubjectedtothis D3302 Test Method for Total Moisture in Coal
test shall not be used in the determination of other test
3. Terminology
parameters. It is recognized that the conditions of the test can
increase the potential for significant oxidation effects on some
3.1 Definitions—For additional definitions of terms used in
coals. If the oxidation potential is of concern, the use of this this test method, refer to Terminology D121.
single-stage method shall involve prior agreement between the
4. Summary of Test Method
parties involved. This test method shall not be construed as the
referee standard test method for total moisture. For referee
4.1 Moisture is determined by establishing the weight loss
purposes, users of this test method are referred to Test Method
of the coal sample by drying in an oven with forced-air
D3302 for moisture determination methods which are not as
circulation.
susceptible to oxidation effects.
5. Significance and Use
1.2 Statistical analysis of data from several sources indi-
5.1 The measurement of total moisture is required to deter-
cates that at a 95% confidence level, there is statistically no
mine whether coal meets commercial or environmental
significant difference between the mean value of the results
specifications, or both. Within the limitations prescribed in the
obtained by D2961 and D3302 (that is, no bias is detected
scope, this test method describes a procedure for determination
between the two methods at the 95% confidence level) for
of total moisture that requires less time than the procedures
moisture levels between 1.4% and 15.8%. These two test
described in Test Method D3302.
methods were not compared in this study for some ranks of
coal including lignite and anthracite. (See 10.2.)
6. Apparatus
1.3 The values stated in SI units are to be regarded as
6.1 Drying Pans, noncorrodible, stable at the temperature
standard. No other units of measurement are included in this
used, and of such size that the sample can be spread to a depth
standard.
of not more than 25 mm (1 in.).
1.4 This standard does not purport to address all of the
6.1.1 The pan size may be varied to suit the size of the
safety concerns, if any, associated with its use. It is the
sample and the oven. The height of the sides shall be no more
responsibility of the user of this standard to establish appro- 1
than 40 mm (1 ⁄2 in.) so that air is not restricted in passing over
priate safety and health practices and determine the applica-
the coal.
bility of regulatory limitations prior to use.
6.2 Drying Oven, forced air-type capable of maintaining a
temperature of 107 6 3°C and constructed to provide for a
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
2
Analysis. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2011. Published December 2011. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1971. Last previous edition approved in 2007 as D2961 – 02(2007). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D2961-11. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D2961 − 11
TABLE 1 Concentrations Range and Limits for Repeatability and
continuous air flow to all parts of the oven. Air changes shall
Reproducibility for Single-Stage Total Moisture
be at the rate of two to four volumes per minute.
Repeatability Limit Reproducibility Limit
rR
7. Sampling
0.30% 0.50%
7.1 The sample shall be prepared to 2.36 mm (No. 8)
according to Test Method D2013. Divide from the 2.36-mm
9. Calculation
(No. 8) sieve size subsample (Test Method D2013) a portion
9.1 Calculate the moisture content of the sample as follows:
not less
...
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:D2961–02 (Reapproved 2007) Designation:D2961–11
Standard Test Method for
Single-Stage Total Moisture Less than 15 % in Coal
1
Reduced to 2.36-mm (No. 8 Sieve) Topsize
This standard is issued under the fixed designation D2961; 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 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. (See 9.210.2.)
1.3The values stated in SI units are to be regarded as the standard.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D121 Terminology of Coal and Coke
D2013 Practice for Preparing Coal Samples for Analysis
D3302 Test Method for Total Moisture in Coal
3. Summary of Test Method
3.1Moisture is determined by establishing the weight loss of the coal sample by drying in an oven with forced-air circulation.
Terminology
3.1 Definitions—For additional definitions of terms used in this test method, refer to Terminology D121.
4. Summary of Test Method
4.1 Moisture is determined by establishing the weight loss of the coal sample by drying in an oven with forced-air circulation.
5. Significance and Use
4.1The5.1 The measurement of total moisture is required to determine whether coal meets commercial or environmental
specifications, or both. Within the limitations prescribed in the scope, this test method describes a procedure for determination of
total moisture that requires less time than the procedures described in Test Method D3302.
1
This test method is under the jurisdiction ofASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.21 on Methods ofAnalysis.
´1
Current edition approved May 1, 2007. Published May 2007. Originally approved in 1971. Last previous edition approved in 2002 as D2961–02 . DOI:
10.1520/D2961-02R07.
Current edition approved Nov. 1, 2011. Published December 2011. Originally approved in 1971. Last previous edition approved in 2007 as D2961 – 02(2007). DOI:
10.1520/D2961-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D2961–11
5.
6. Apparatus
5.1
6.1 Drying Pans, noncorrodible, stable at the temperature used, and of such size that the sample can be spread to a depth of
not more than 25 mm (1 in.).
5.1.1The6.1.1 The pan size may be varied to suit the size of the sample and the oven. The height of the sides shall be no more
1
than 40 mm (1 ⁄2
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.