ASTM D2234-00

Standard Practice for Collection of a Gross Sample of Coal

SCOPE
1.1 This practice covers procedures for the collection of a sample under various conditions of sampling. The sample is to be crushed and further prepared for analysis in accordance with Method D2013. However, the procedures for dividing large samples before any crushing are given in this practice.  
1.2 This practice describes general and special purpose sampling procedures for coals (1) by size and condition of preparation (for example, mechanically cleaned coal or raw coal) and (2) by sampling characteristics.  
1.3 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-Nov-2001
• Technical Committee: D05 - Coal and Coke
• Drafting Committee: D05.23 - Sampling

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D 2234–00
Standard Practice for
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Collection of a Gross Sample of Coal
This standard is issued under the fixed designation D 2234; 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.
INTRODUCTION
Data obtained from coal samples are used in establishing price, controlling mine and cleaning plant
operations, allocating production costs, and determining plant or component efficiency. The task of
obtaining a sample of reasonable weight to represent an entire lot presents a number of problems and
emphasizes the necessity for using standard sampling procedures.
Coal is one of the most difficult of materials to sample, varying in composition from noncombus-
tible particles to those which can be burned completely, with all gradations in between. The task is
further complicated by the use of the analytical results, the sampling equipment available, the quantity
to be represented by the sample, and the degree of precision required.
This practice gives the overall requirements for the collection of coal samples. The wide varieties
ofcoal-handlingfacilitiesprecludethepublicationofdetailedproceduresforeverysamplingsituation.
The proper collection of the sample involves an understanding and consideration of the physical
character of the coal, the number and weight of increments, and the overall precision required.
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1. Scope E 456 Terminology Relating to Quality and Statistics
1.1 This practice covers procedures for the collection of a
3. Terminology
sample under various conditions of sampling. The sample is to
3.1 Definitions of Terms Specific to This Standard:
becrushedandfurtherpreparedforanalysisinaccordancewith
3.1.1 accuracy:
Method D 2013. However, the procedures for dividing large
3.1.1.1 generally—a term used to indicate the reliability of
samples before any crushing are given in this practice.
a sample, a measurement, or an observation.
1.2 This practice describes general and special purpose
3.1.1.2 specifically—a measure of closeness of agreement
sampling procedures for coals (1) by size and condition of
between an experimental result and the true value. Example:
preparation (for example, mechanically cleaned coal or raw
the observed and true sulfur content of a coal consignment.
coal) and (2) by sampling characteristics.
This measure is affected by chance errors as well as by bias.
1.3 This standard does not purport to address all of the
3.1.2 cross-belt sampler—a sampling machine designed to
safety concerns, if any, associated with its use. It is the
extract an increment directly from a conveyor belt surface by
responsibility of the user of this standard to establish appro-
taking a sweep through the material on the conveyor.
priate safety and health practices and determine the applica-
3.1.3 falling-stream sampler—a sampling machine de-
bility of regulatory limitations prior to use.
signed to extract an increment from a falling stream of coal at
2. Referenced Documents the discharge end of a conveyor or chute by moving through
the falling stream of material.
2.1 ASTM Standards:
3.1.4 gross sample—a sample representing one lot of coal
D 121 Terminology of Coal and Coke
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and composed of a number of increments on which neither
D 2013 Method of Preparing Coal Samples for Analysis
reduction nor division has been performed.
E 177 Practice for Use of the Terms Precision and Bias in
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3.1.5 increment—a small portion of the lot collected by one
ASTM Test Methods
operation of a sampling device and normally combined with
other increments from the lot to make a gross sample.
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These methods are under the jurisdiction of ASTM Committee D05 on Coal
3.1.6 representative sample—a sample collected in such a
and Coke and are the direct responsibility of Subcommittee D05.23 on Sampling.
manner that every particle in the lot to be sampled is equally
Current edition approved Nov. 10, 2000. Published January 2001. Originally
represented in the gross or divided sample.
published as D 2234 – 63 T. Last previous edition D 2234 – 99.
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Annual Book of ASTM Standards, Vol 05.06.
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Annual Book of ASTM Standards, Vol 14.02.
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D 2234–00
3.1.7 sample—a quantity of material taken from a larger 5.2 After further processing (Method D 2013), the sample
quantity for the purpose of estimating properties or composi- may be analyzed for a number of different parameters. These
tion of the larger quantity. parameters may affect the lot’s value, its ability to me
...