ASTM D7430-16
(Practice)Standard Practice for Mechanical Sampling of Coal
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 4 parts A, B, C, and D. These 4 parts represent the previous standards D7256/D7256M, D4916, D4702, and D6518. These 4 standards are the 4 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 31.
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. For specific hazard statements, see Sections 7, 16, 21, 34, and 37.1.1.
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Designation: D7430 − 16
StandardPractice for
1
Mechanical Sampling of Coal
This standard is issued under the fixed designation D7430; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 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
furthercomplicatedbytheuseoftheanalyticalresults,thesamplingequipmentavailable,thequantity
to be represented by the sample, and the degree of precision required.
Thispracticegivestheoverallrequirementsforthecollectionandwithin-systempreparationofcoal
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
weight of increments, and the overall precision required.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This practice is divided into 4 parts A, B, C, and D.
D121Terminology of Coal and Coke
These 4 parts represent the previous standards D7256/
D2013/D2013MPractice for Preparing Coal Samples for
D7256M, D4916, D4702, and D6518. These 4 standards are
Analysis
the 4 that govern the mechanical sampling of coal and have
D2234/D2234MPractice for Collection of a Gross Sample
been combined into one document for the ease of reference of
of Coal
the users of these standards.
D4621Guide for Quality Management in an Organization
1.2 The scope of Part A can be found in Section 4. 3
That Samples or Tests Coal and Coke (Withdrawn 2010)
D4702Practice for Quality Management of Mechanical
1.3 The scope of Part B can be found in Section 13.
3
Coal Sampling Systems (Withdrawn 2008)
1.4 The scope of Part C can be found in Section 19.
D4749Test Method for Performing the Sieve Analysis of
Coal and Designating Coal Size
1.5 The scope of Part D can be found in Section 31.
D4916PracticeforMechanicalAugerSampling(Withdrawn
1.6 This standard does not purport to address all of the
3
2008)
safety concerns, if any, associated with its use. It is the
D6518Practice for Bias Testing a Mechanical Coal Sam-
responsibility of the user of this standard to establish appro-
3
pling System (Withdrawn 2008)
priate safety and health practices and determine the applica-
D7256/D7256MPractice for Mechanical Collection and
bility of regulatory limitations prior to use. For specific hazard
Within-System Preparation of a Gross Sample of Coal
statements, see Sections 7, 16, 21, 34, and 37.1.1.
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 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
CurrenteditionapprovedJune1,2016.PublishedJuly2016.Originallyapproved the ASTM website.
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in 2008. Last previous edition approved in 2015 as D7430–15b. DOI: 10.1520/ The last approved version of this historical standard is referenced on
D7430-16. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7430 − 16
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from Moving Streams (Withdrawn 2008) haveanequalprobabilityofbeingintercepted(captured)bythe
E105Practice for Probability Sampling of Materials sampler cutter during increment collection.
E122PracticeforCalculatingSampleSizetoEstimate,With
3.2.11 ellipsoidal region, n—anareathatisformedbyplane
Specified Precision, the Average for a Characteristic of a
sections of ellipses that are defined by the values selected for
Lot or Process
the largest tolerable bias of each coal characteristic used in the
E177Practice for Use of the Terms Precision and Bias i
...
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.
Designation: D7430 − 15b D7430 − 16
Standard Practice for
1
Mechanical Sampling of Coal
This standard is issued under the fixed designation D7430; 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 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 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
weight of increments, and the overall precision required.
1. Scope
1.1 This practice is divided into 4 parts. parts A, B, C, and D. These 4 parts represent the previous standards D7256/D7256M,
D4916, D4702, and D6518. These 4 standards are the 4 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.
Part A
1.2 Part A—Mechanical Collection and Within-System Preparation of a Gross Sample of Coal from Moving Streams—Covers
procedures for the mechanical collection of a sample under Classification I-B-1 and I-B-2 (Practice D2234/D2234M) and the
within-system preparation (reduction and division) of gross samples utilizing various components of the mechanical sampling
system.
1.2.1 Part A describes mechanical sampling procedures for coals (1) by size and condition of preparation (for example,
mechanically cleaned coal or raw coal), and (2) by sampling characteristics.
1.2.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
Part B
1.3 Part B—Mechanical Auger Sampling—Describes procedures for the collection of an increment, partial sample, or gross
sample of material using mechanical augers. Reduction and division of the material by mechanical equipment at the auger is also
covered. Further manual or mechanical reduction or division of the material elsewhere shall be performed in accordance with
Practice D2013.
1.3.1 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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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 Nov. 1, 2015June 1, 2016. Published November 2015July 2016. Originally approved in 2008. Last previous edition approved in 2015 as
D7430–15A.–15b. DOI: 10.1520/D7430-15B. 10.1520/D7430-16.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7430 − 16
Part C
1.2 Part C—Quality Management of Mechanical Coal Sampling Systems—Is applicable to the quality management of
cross-belt, falling stream, and auger sampling systems.The scope of Part A can be found in Section 4.
1.4.1 Spacing of increments pertains to the kind of interval between increments. Intervals can be defined in quantitative terms,
such as units of time or mass, or in term
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