ASTM D7430-08ae1
(Practice)Standard Practice for Mechanical Sampling of Coal
Standard Practice for Mechanical Sampling of Coal
SIGNIFICANCE AND USE
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.
After removal from the sampling system and further preparation (Practice D 2013), 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. These 4 parts represent the previous standards D 7256/D 7256M, D 4916, D 4702, and D 6518. 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 Top
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 D 2234/D 2234M) 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 Top
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 D 2013.
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. Part C Top
1.4 Part C—Quality Management of Mechanical Coal Sampling Systems—Is applicable to the quality management of cross-belt, falling stream, and auger sampling systems.
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 terms of position over the lot.
1.4.2 Spacing of Increments for Cross-Belt and Falling Stream Samplers—Cross-belt and falling stream type mechanical sampling systems take increments based on time, either at fixed time intervals or at random times during a fixed time strata. Some falling stream samplers can take increments based on equal mass of coal sampled as determined by scales. The sections of this practice that pertain to cross-belt and falling stream samplers describe procedures for only time-based sampling systems. This time-based inspection guideline will satisfy most criteria for mass-based or combination mass-based and time-based sampling systems. If there are items that are not covered, the inspector should refer to the manufacturer's literature.
1.4.3 Spacing of Increments for Auger Sampling—The spacing of increments collected by auger sampling systems is defined in terms of position over the lot.
1.4.4 It is essential that the inspector have the documentation listed in Section 2 of this practice when conducting an inspection.
1.4.5 The values stated in SI units are to be regarded as standard. No other units of measurement are ...
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´1
Designation: D7430 – 08a
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.
1
´ NOTE—Section 7.2.2 was editorially inserted in May 2009.
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.
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 division) of gross samples utilizing various components of the
mechanical sampling system.
1.1 This practice is divided into four parts. These four parts
1.2.1 Part A describes mechanical sampling procedures for
represent the previous standards D7256/D7256M, D4916,
coals (1) by size and condition of preparation (for example,
D4702, and D6518. These four standards are the four that
mechanically cleaned coal or raw coal), and (2) by sampling
govern the mechanical sampling of coal and have been
characteristics.
combined into one document for the ease of reference of the
1.2.2 ThevaluesstatedineitherSIunitsorinch-poundunits
users of these standards.
are to be regarded separately as standard. The values stated in
Part A
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
1.2 Part A—Mechanical Collection and Within-System
values from the two systems may result in non-conformance
Preparation of a Gross Sample of Coal from Moving
with the standard.
Streams—Coversproceduresforthemechanicalcollectionofa
sample under Classification I-B-1 and I-B-2 (Practice D2234/
Part B
D2234M) and the within-system preparation (reduction and
1.3 Part B—Mechanical Auger Sampling——Describes
proceduresforthecollectionofanincrement,partialsample,or
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and
gross sample of material using mechanical augers. Reduction
Coke and is the direct responsibility of Subcommittee D05.23 on Sampling.
and division of the material by mechanical equipment at the
Current edition approved Oct. 1, 2008. Published December 2008. Originally
auger is also covered. Further manual or mechanical reduction
approved in 2008. Last previous edition approved 2008 as D7430–08. DOI:
10.1520/D7430-08AE01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
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D7430 – 08a
or division of the material elsewhere shall be performed in 2. Referenced Documents
2
accordance with Practice D2013.
2.1 ASTM Standards:
1.3.1 The values stated in SI units are to be regarded as
D121 Terminology of Coal and Coke
standard. No other units of measurement are included in this
D2013 Practice for Preparing Coal Samples for Analysis
standard.
D2234/D2234M Practice for Collection of a Gross Sample
of Coal
Part C
D4621 Guide for Quality Management in an Organization
That Samples or Tests Coal and Coke
1.4 Part C—Quality Management of Mechanical Coal Sam-
D4702 Practice for Quality Management of Mechanical
pling Systems—Is applicable to the quality management of
3
cross-belt, falling stream, and auger sampling systems. Coal Sampling Systems
D4749 Test Method for Performing the Sieve Analysis of
1.4.1 Spacing of increments pertains to the kind of interval
Coal and Designating Coal Size
between incre
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D7430–08a Designation: D 7430 – 08a
Standard Practice for
1
Mechanical Sampling of Coal
This standard is issued under the fixed designation D 7430; 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
´ NOTE—Section 7.2.2 was editorially inserted in May 2009.
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.
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
1.1 This practice is divided into 4 parts. These 4 parts represent the previous standards D 7256/D 7256M, D 4916, D 4702, and
D 6518. 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 D 2234/D 2234M) 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 D 2013.
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.
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 Oct. 1, 2008. Published December 2008. Originally approved in 2008. Last previous edition approved 2008 as D 7430–08.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
´1
D 7430 – 08a
Part C
1.4 Part C—Quality Management of Mechanical Coal Sampling Systems—Is applicable to the quality management of
cross-belt, falling stream, and auger sampling systems.
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 terms of position over the lot.
1.4.2 Spacing of Increments for C
...
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