ASTM D6883-03a
(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
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.). Samples are collected at this depth to get below the surface of the material, where drying and oxidation may have occurred. The purpose is to avoid collecting increments that are significantly different from the majority of the lot of coal being sampled due to environmental effects. The user is cautioned that samples so obtained do not represent material beyond the point of penetration. Sample increments collected from the surface layer(s) of coal in railroad cars, barges, or stockpiles are classified condition "D" (see Practice D 2234 section 6, 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: D 6883 – 03a
Standard Practice for
Manual Sampling of Stationary Coal from Railroad Cars,
1
Barges, Trucks, or Stockpiles
This standard is issued under the fixed designation D 6883; 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 1.5 The quantities stated in either acceptable SI units or in
inch-pound units are regarded separately as standard. The
1.1 This practice covers procedures for obtaining a manual
quantities stated in each system may not be exact equivalents;
gross sample from beneath the surface of coal in railroad cars,
therefore, each system must be used independently of the other,
barges, trucks, or stockpiles. These procedures are to be used to
without combining quantities in any way.
provide gross samples for estimating the quality of the coal.
1.6 This standard does not purport to address all of the
The gross samples are to be crushed, divided, and further
safety concerns, if any, associated with its use. It is the
prepared for analysis in accordance with Practice D 2013.
responsibility of the user of this standard to establish appro-
1.2 This practice provides instruction for sampling beneath
priate safety and health practices and determine the applica-
the exposed surface coal to a depth of approximately 61 cm (24
bility of regulatory limitations prior to use.
in.). Samples are collected at this depth to get below the surface
of the material, since drying and oxidation may have occurred
2. Referenced Documents
at, or near the surface. Changes in moisture, in particle size,
2
2.1 ASTM Standards:
and in other properties continue to occur deeper in the coal and,
D 121 Terminology of Coal and Coke
although not as drastic as near the surface, will cause the
D 2013 Practice for Preparing Coal Samples for Analysis
method to be biased. The user should review the conditions of
D 2234 Practice for Collection of a Gross Sample of Coal
the coal (weather conditions, prior transport, settling time, and
D 4749 Test Method for Performing Sieve Analysis of Coal
so forth, see 8.1) so that the interested parties can agree that
and Designating Coal Size
potential biases are not overly great or that some adjustment in
D 4916 Practice for Mechanical Auger Sampling
specifiactions is warrented. Sample increments collected from
E 105 Practice for Probability Sampling of Materials
the surface layer(s) of coal in railroad cars, barges, or stock-
E 177 Practice for Use of the Terms Precision and Bias in
piles are classified condition “D” (see Practice D 2234 section
ASTM Test Methods
6, Increment Collection Classification). It is a good practice to
E 456 Terminology for Relating to Quality and Statistics
require that “details of sampling procedure shall be agreed
upon in advance by all parties concerned” whenever collection
3. Terminology
of sample increments falls under condition “D.” This practice
3.1 Definitions:
offers a sampling procedure that parties may use to meet
3.1.1 consignment, n—a discrete amount of coal, such as a
requirements of Practice D 2234 for condition “D.” The
shipment, a carload, a unit train, or a day’s production. A
practice does not produce samples that satisfy precision re-
consignment may include more than one lot of coal and may
quirements of Practice D 2234 general-purpose sampling, or
correspond to a specific period of time such as sampling period
Practice D 2234 special-purpose sampling.
or billing period.
1.3 The user is cautioned that samples of this type do not
3.1.2 particle segregation, n—the segregation of sized par-
satisfy the minimum requirements for probability sampling and
ticles to specific areas as a result of the particles rolling, falling,
as such cannot be used to draw statistical inferences such as
or sliding down the sides of a pile or a result of the peculiarities
precision, standard error, or bias.
of a coal handling system used to build the pile. Particle
1.4 This sampling method is intended for use only when
segregation is a process of separation, not exclusively by size,
sampling by more reliable methods that provide a probability
but by size, shape, and density.
sample is not possible.
1 2
This practice is under the jurisdiction of ASTM Committee D05 on Coal and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Coke and is the direct responsibility of Subcommittee D05.23 on Sampling. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Oct. 1, 2003. Published October 2003. Orginally Standards volume information, refer to the standard’s Document Summary page on
approved
...
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