ASTM D7430/D7430M-20

Standard Practice for Mechanical Sampling of Coal

SIGNIFICANCE AND USE
6.1 It is intended that this practice be used to provide a sample representative of the coal from which it is collected. Because of the variability of coal and the wide variety of mechanical sampling equipment available, caution should be used in all stages of the sample collection process, the design of sampling system specifications, the equipment procurement, and the acceptance testing of installed equipment.  
6.2 After removal from the sampling system and further preparation (Practice D2013/D2013M), the sample may be analyzed for a number of different parameters. These parameters may define the lot's value, its ability to meet specifications, its environmental impact, as well as other properties.
SCOPE
1.1 This practice is divided into four parts: A, B, C, and D. These four parts represent the previous Practices D7256/D7256M, D4916, D4702, and D6518. These four standards are the four that govern the mechanical sampling of coal and have been combined into one document for the ease of reference of the users of these standards.  
1.2 The scope of Part A can be found in Section 4.  
1.3 The scope of Part B can be found in Section 13.  
1.4 The scope of Part C can be found in Section 19.  
1.5 The scope of Part D can be found in Section 32.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Sections 7, 16, 21, 35, and 38.1.1.  
1.7 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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2020
• ICS: 73.040 - Coals
• ICS: 75.160.10 - Solid fuels
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7430/D7430M − 20
Standard Practice for
1
Mechanical Sampling of Coal
This standard is issued under the fixed designation D7430/D7430M; 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.
INTRODUCTION
Analysis 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 mass 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
furthercomplicatedbytheuseoftheanalyticalresults,thesamplingequipmentavailable,thequantity
to be represented by the sample, and the degree of precision required.
Thispracticegivestheoverallrequirementsforthecollectionandwithin-systempreparationofcoal
samplesthroughtheuseofmechanicalsamplingsystemsutilizingfalling-stream,cross-belt,andauger
designs.This practice also gives the overall requirements for the bias testing and quality management
of mechanical coal sampling systems. The wide varieties of coal-handling facilities preclude the
publication of detailed procedures for every sampling situation. The proper collection of the sample
involves an understanding and consideration of the physical character of the coal, the number and
mass of increments, and the overall precision required.
1. Scope 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This practice is divided into four parts:A, B, C, and D.
ization established in the Decision on Principles for the
These four parts represent the previous Practices D7256/
Development of International Standards, Guides and Recom-
D7256M,D4916,D4702,andD6518.Thesefourstandardsare
mendations issued by the World Trade Organization Technical
the four that govern the mechanical sampling of coal and have
Barriers to Trade (TBT) Committee.
been combined into one document for the ease of reference of
the users of these standards.
2. Referenced Documents
1.2 The scope of Part A can be found in Section 4.
2
2.1 ASTM Standards:
1.3 The scope of Part B can be found in Section 13.
D121Terminology of Coal and Coke
D2013/D2013MPractice for Preparing Coal Samples for
1.4 The scope of Part C can be found in Section 19.
Analysis
1.5 The scope of Part D can be found in Section 32.
D2234/D2234MPractice for Collection of a Gross Sample
1.6 This standard does not purport to address all of the
of Coal
safety concerns, if any, associated with its use. It is the
D3302Test Method for Total Moisture in Coal
responsibility of the user of this standard to establish appro-
D4621Guide for Quality Management in an Organization
priate safety, health, and environmental practices and deter- 3
That Samples or Tests Coal and Coke (Withdrawn 2010)
mine the applicability of regulatory limitations prior to use.
D4702Practice for Quality Management of Mechanical
For specific hazard statements, see Sections 7, 16, 21, 35, and 3
Coal Sampling Systems (Withdrawn 2008)
38.1.1.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and contact ASTM Customer Service at [e-mail]. 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 Nov. 1, 2020. Published December 2020. Originally the ASTM website.
ε1 3
approved in 2008. Last previous edition approved in 2018 as D7430–18a . DOI: The last approved version of this historical standard is referenced on
10.1520/D7430_D7430M-20. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D7430/D7430M − 20
D4749Test Method for Performing the Sieve Analysis of 3.2.9 cross-belt sampler, n—a single sampling machine or
Coal and Designating Coal Size component of a mechanical sampling system designed to
D4916PracticeforMechanicalAugerSampling(Withdrawn extract an increment directly from a conveyor belt surface by
3
2008) sweeping a sampling device (cutter) through the material on
D6518Practice for Bias Testing a Mechanical Coal Sam- the conveyor.
3
pling System (
...

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.
´1
Designation: D7430 − 18a D7430/D7430M − 20
Standard Practice for
1
Mechanical Sampling of Coal
This standard is issued under the fixed designation D7430;D7430/D7430M; 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
ε NOTE—Editorial changes were made to Fig. 2 and Fig. 3 in February 2020.
INTRODUCTION
Analysis 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 mass 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 and within-system preparation of coal
samples through the use of mechanical sampling systems utilizing falling-stream, cross-belt, and auger
designs. This practice also gives the overall requirements for the bias testing and quality management
of mechanical coal sampling systems. The wide varieties of coal-handling facilities preclude the
publication of detailed procedures for every sampling situation. The proper collection of the sample
involves an understanding and consideration of the physical character of the coal, the number and
mass of increments, and the overall precision required.
1. Scope
1.1 This practice is divided into four parts: A, B, C, and D. These four parts represent the previous standardsPractices
D7256/D7256M, D4916, D4702, and D6518. These four standards are the four that govern the mechanical sampling of coal and
have been combined into one document for the ease of reference of the users of these standards.
1.2 The scope of Part A can be found in Section 4.
1.3 The scope of Part B can be found in Section 13.
1.4 The scope of Part C can be found in Section 19.
1.5 The scope of Part D can be found in Section 32.
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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. For specific hazard statements, see Sections 7, 11.2.216, 21, 1.435, and 38.1.1.
1
This practice 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 15, 2018Nov. 1, 2020. Published May 2018December 2020. Originally approved in 2008. Last previous edition approved in 2018 as
ε1
D7430 – 18.D7430 – 18a . DOI: 10.1520/D7430-18AE01.10.1520/D7430_D7430M-20.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7430/D7430M − 20
1.7 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
2.1 ASTM Standards:
D121 Terminology of Coal and Coke
D2013/D2013M Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
D3302 Test Method for Total Moisture in Coal
3
D4621 Guide for Quality Management in an Organization That Samples or Tests Coal and Coke (Withdrawn 2010)
3
D4702 Practice for Quality Management of Mechanical Coal Sampling Systems (Withdrawn 2008)
D4749 Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
3
D4916 Practice for Mechanical Auger Sampling (Withdrawn 2008)
3
D6518 Practice for Bias Testing a Mechanical Coal Sampling System (Withdrawn 2008)
D7256/D7256M Practice for Mechanical Collection and Within-Syste
...