ASTM D6609-17

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Designation: D6609 − 08 (Reapproved 2015) D6609 − 17
Standard Guide for
Part-Stream Sampling of Coal
This standard is issued under the fixed designation D6609; 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 guide covers general principles for obtaining a gross sample of coal by taking increments from part of a stream of coal
rather than from the entire stream to be sampled. The usefulness of results from this guide will vary greatly depending on such
factors as top size of the coal, size consistency of the coal, variability of the coal, and such logistical factors as the flow rate of
the coal in process and physical accessibility of the sampling station.
1.2 This guide should be used only when it is not possible to use a method of sampling that produces a probability sample.
1.3 Sample preparation procedures involving crushing are contained in Practice D2013.
1.4 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory requirements prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D121 Terminology of Coal and Coke
D2013 Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
E456 Terminology Relating to Quality and Statistics
2.2 Federal Standards:
Federal Mine and Safety and Health Act of 1977
Occupational Safety and Health Act of 1970
3. Terminology
3.1 Definitions—For additional definitions of terms, refer to Terminology D121, Practice D2013, Terminology E456, and
Practice D2234/D2234M.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 part-stream sampling, n—a method of coal sampling in which collection of individual increments does not encompass the
full cross section of the coal stream.
4. Summary of Guide
4.1 Part-stream sampling is accomplished by collecting increments from part of a stream of coal for the purpose of acquiring
a gross sample.
This guide is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.23 on Sampling.
Current edition approved April 1, 2015Oct. 15, 2017. Published May 2015October 2017. Originally approved in 2000. Last previous edition approved in 20082015 as
D6609-08-15 DOI: 10.1520/D6609-08R15.10.1520/D6609-17.
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D6609 − 17
5. Significance and Use
5.1 This guide provides instructions for sampling by collecting individual increments from part of a cross section of a moving
stream of coal, as opposed to collection of individual increments by removal of a full cross section of material. The use of
part-stream sampling, and the detailed procedures for each case, should be agreed upon in advance by all parties concerned.
Samples collected by use of this guide are not probability samples. 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 obtain any meaningful statistical inferences such
as the sampling precision, standard error, or bias.
5.2 All parties should be cautioned that manual sampling of coal from a moving stream might not enable sampling of the
material that is furthermost from the point of entry into stream by the sampling device.
6. Increment Collection Classification
6.1 Three distinct classifications of part-stream sampling methods are recognized by this guide, in order of preference, as listed
below:
6.1.1 Condition C-1—The case in which groups of successive part-stream increments are taken so that the increments within
each group encompass the full cross section of the coal stream.
6.1.2 Condition C-2—The case in which groups of successive part-stream increments are collected from different positions
relative to the full cross section of the coal stream but the increments within each group do not encompass the full cross section.
6.1.3 Condition C-3—The case in which groups of successive part-stream increments are collected from the same relative
position to the full cross section of the coal stream.
7. Organization and Planning of Sampling Operations
7.1 Considerations When Sampling from a Coal Stream:
7.1.1 Safety Considerations—If the sampling device is to be used manually, safety and ease of operation should be carefully
considered. For example, aluminum can be used to minimize the weight of the device and special handles fabricated to facilitate
its use. Shovels with loop handles should be used only with extreme caution. There is the potential to catch and drag the sampling
device and sampler while manually sampling a moving stream. Sampling personnel should be protected from moving parts such
as conveyors or belt idlers. A safety harness for the sampling personnel may be an appropriate safety device in some sampling
situations. The user of this guide must be aware that each sampling situation has its own unique safety requirements that should
be thoroughly reviewed before the start of sample collection. This standard does not purport to address all safety requirements;
however, users are urged to comply with all Federal requirements such as those contained in the Federal Mine Safety and Health
Act of 1977, the Occupational Safety and Health Act of 1970, as well as state and local regulations and site specific safety policies
and procedures.
7.1.2 Width of Sampling Device—The width of the sampling device shall be a minimum of 23 ⁄2 times the nominal top size of
the coal being sampled.
7.1.3 Depth of Sampling Device—When determining the depth of the sampling device, two considerations are: (1) top size of
the coal and (2) feed rate of the coal. The depth of the sampling device shall be sufficient so that it does not overfill during
increment collection. Thus, the
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