ASTM D7430-11
(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 D2013), 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 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 Top
1.2 Part AMechanical 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 Top
1.3 Part BMechanical 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. Part C Top
1.4 Part CQuality 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 included in t...
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Designation: D7430 – 11
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.
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 1.2.1 Part A describes mechanical sampling procedures for
coals (1) by size and condition of preparation (for example,
1.1 This practice is divided into 4 parts. These 4 parts
mechanically cleaned coal or raw coal), and (2) by sampling
represent the previous standards D7256/D7256M, D4916,
characteristics.
D4702, and D6518.These 4 standards are the 4 that govern the
1.2.2 ThevaluesstatedineitherSIunitsorinch-poundunits
mechanical sampling of coal and have been combined into one
are to be regarded separately as standard. The values stated in
document for the ease of reference of the users of these
each system may not be exact equivalents; therefore, each
standards.
system shall be used independently of the other. Combining
Part A
values from the two systems may result in non-conformance
with the standard.
1.2 Part A—Mechanical Collection and Within-System
Preparation of a Gross Sample of Coal from Moving
Part B
Streams—Coversproceduresforthemechanicalcollectionofa
1.3 Part B—Mechanical Auger Sampling——Describes
sample under Classification I-B-1 and I-B-2 (Practice D2234/
proceduresforthecollectionofanincrement,partialsample,or
D2234M) and the within-system preparation (reduction and
gross sample of material using mechanical augers. Reduction
division) of gross samples utilizing various components of the
and division of the material by mechanical equipment at the
mechanical sampling system.
auger is also covered. Further manual or mechanical reduction
or division of the material elsewhere shall be performed in
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and
accordance with Practice D2013.
Coke and is the direct responsibility of Subcommittee D05.23 on Sampling.
1.3.1 The values stated in SI units are to be regarded as
Current edition approved June 1, 2011. Published August 2011. Originally
standard. No other units of measurement are included in this
approved in 2008. Last previous edition approved 2010 as D7430–10b. DOI:
10.1520/D7430-11. standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D7430 – 11
Part C 2. Referenced Documents
2
2.1 ASTM Standards:
1.4 Part C—Quality Management of Mechanical Coal Sam-
D121 Terminology of Coal and Coke
pling Systems—Is applicable to the quality management of
D2013 Practice for Preparing Coal Samples for Analysis
cross-belt, falling stream, and auger sampling systems.
D2234/D2234M Practice for Collection of a Gross Sample
1.4.1 Spacing of increments pertains to the kind of interval
of Coal
between increments. Intervals can be defined in quantitative
D4621 Guide for Quality Management in an Organization
terms, such as units of time or mass, or in terms of position
3
That Samples or Tests Coal and Coke
over the lot.
D4702 Practice for Quality Management of Mechanical
1.4.2 Spacing of Increments for Cross-Belt and Falling
3
Coal Sampling Sy
...
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.
Designation:D7430–10b Designation: D7430 – 11
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.
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 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.
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.
CurrenteditionapprovedSept.June1,2010.2011.PublishedOctober2010.August2011.Originallyapprovedin2008.Lastpreviouseditionapproved2010asD7430–10ab.
DOI: 10.1520/D7430-10B. 10.1520/D7430-11.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D7430 – 11
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 Cross-Belt and Falling Stream Samplers
...
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