ASTM D6883-04
(Practice)Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges, Trucks, or Stockpiles
Standard Practice for Manual Sampling of Stationary Coal from Railroad Cars, Barges, Trucks, or Stockpiles
SIGNIFICANCE AND USE
These guidelines provide procedures for manually collecting gross samples from beneath the exposed surface of coal in railroad cars, barges, trucks, or stockpiles taking into account the wide variety of conditions that may be encountered. The samples are further processed for the laboratory to provide estimations of the coal quality. The use of this practice is conditional upon agreement among all interested parties concerning all relevant details of sample collection before sampling begins. These include, but are not limited to: lot size; number and mass of increments; the size, shape, and manipulation of the increment collection devices; location of increment collection site or sites; circumstances under which increments are not to be collected or suspended; and safety precautions. It is preferable that such agreements be in writing. The user is cautioned that samples so obtained do not represent material below the point of penetration.
SCOPE
1.1 This practice covers procedures for obtaining a manual gross sample from beneath the surface of coal in railroad cars, barges, trucks, or stockpiles. These procedures are to be used to provide gross samples for estimating the quality of the coal. The gross samples are to be crushed, divided, and further prepared for analysis in accordance with Practice D 2013.
1.2 This practice provides instruction for sampling beneath the exposed surface coal to a depth of approximately 61 cm (24 in.). Collect samples at this depth to get below the surface of the material, since drying and oxidation may have occurred at, or near the surface. Changes in moisture, in particle size, and in other properties continue to occur deeper in the coal and, although not as drastic as near the surface, will cause the method to be biased. The user should review the conditions of the coal (weather conditions, prior transport, settling time, and so forth, see 8.1) so that the interested parties can agree that potential biases are not overly great or that some adjustment in specifications is warranted. Sample increments collected from the surface layer(s) of coal in railroad cars, barges, or stockpiles are classified condition "D" (see Practice D 2234, Increment Collection Classification). It is a good practice to require that "details of sampling procedure shall be agreed upon in advance by all parties concerned" whenever collection of sample increments falls under condition "D." This practice offers a sampling procedure that parties may use to meet requirements of Practice D 2234 for condition "D." The practice does not produce samples that satisfy precision requirements of Practice D 2234 general-purpose sampling, or Practice D 2234 special-purpose sampling.
1.3 The user is cautioned that samples of this type do not satisfy the minimum requirements for probability sampling and as such cannot be used to draw statistical inferences such as precision, standard error, or bias.
1.4 This sampling method is intended for use only when sampling by more reliable methods that provide a probability sample is not possible.
1.5 The quantities stated in either acceptable SI units or in inch-pound units are regarded separately as standard. The quantities stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining quantities in any way.
1.6 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: D6883 − 04
StandardPractice for
Manual Sampling of Stationary Coal from Railroad Cars,
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Barges, Trucks, or Stockpiles
This standard is issued under the fixed designation D6883; 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 1.4 This sampling method is intended for use only when
sampling by more reliable methods that provide a probability
1.1 This practice covers procedures for obtaining a manual
sample is not possible.
gross sample from beneath the surface of coal in railroad cars,
1.5 The quantities stated in either acceptable SI units or in
barges,trucks,orstockpiles.Theseproceduresaretobeusedto
inch-pound units are regarded separately as standard. The
provide gross samples for estimating the quality of the coal.
quantities stated in each system may not be exact equivalents;
The gross samples are to be crushed, divided, and further
therefore,eachsystemmustbeusedindependentlyoftheother,
prepared for analysis in accordance with Practice D2013.
without combining quantities in any way.
1.2 This practice provides instruction for sampling beneath
1.6 This standard does not purport to address all of the
theexposedsurfacecoaltoadepthofapproximately61cm(24
safety concerns, if any, associated with its use. It is the
in.). Collect samples at this depth to get below the surface of
responsibility of the user of this standard to establish appro-
the material, since drying and oxidation may have occurred at,
priate safety and health practices and determine the applica-
or near the surface. Changes in moisture, in particle size, and
bility of regulatory limitations prior to use.
in other properties continue to occur deeper in the coal and,
although not as drastic as near the surface, will cause the
2. Referenced Documents
method to be biased. The user should review the conditions of
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2.1 ASTM Standards:
the coal (weather conditions, prior transport, settling time, and
D121 Terminology of Coal and Coke
so forth, see 8.1) so that the interested parties can agree that
D2013 Practice for Preparing Coal Samples for Analysis
potential biases are not overly great or that some adjustment in
D2234/D2234M Practice for Collection of a Gross Sample
specifications is warranted. Sample increments collected from
of Coal
the surface layer(s) of coal in railroad cars, barges, or stock-
D4749 Test Method for Performing the Sieve Analysis of
piles are classified condition “D” (see Practice D2234/
Coal and Designating Coal Size
D2234M, Increment Collection Classification). It is a good
D4916 PracticeforMechanicalAugerSampling(Withdrawn
practice to require that “details of sampling procedure shall be
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2008)
agreed upon in advance by all parties concerned” whenever
E105 Practice for Probability Sampling of Materials
collectionofsampleincrementsfallsundercondition“D.”This
E177 Practice for Use of the Terms Precision and Bias in
practice offers a sampling procedure that parties may use to
ASTM Test Methods
meet requirements of Practice D2234/D2234M for condition
E456 Terminology Relating to Quality and Statistics
“D.” The practice does not produce samples that satisfy
precision requirements of Practice D2234/D2234M general-
3. Terminology
purpose sampling, or Practice D2234/D2234M special-purpose
3.1 Definitions:
sampling.
3.1.1 consignment, n—a discrete amount of coal, such as a
1.3 The user is cautioned that samples of this type do not
shipment, a carload, a unit train, or a day’s production. A
satisfytheminimumrequirementsforprobabilitysamplingand
consignment may include more than one lot of coal and may
as such cannot be used to draw statistical inferences such as
correspond to a specific period of time such as sampling period
precision, standard error, or bias.
or billing period.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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This practice is under the jurisdiction of ASTM Committee D05 on Coal and contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Coke and is the direct responsibility of Subcommittee D05.23 on Sampling. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved June 1, 2004. Published June 2004. Orginally approved the ASTM website.
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in 2003. Last previous edition approved in 2003 as D6883–03a. DOI: 10.1520/ The last approved version of this historical standard is referenced on
D6883-04. www.astm.org.
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D6883 − 04
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