ASTM D4702-06

Standard Practice for Quality Management of Mechanical Coal Sampling Systems

SCOPE
1.1 This practice is applicable to cross-belt, falling stream, and auger sampling systems.
1.2 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.
1.2.1 Spacing of Increments for Cross-Belt and Falling Stream SamplersCross-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.
1.2.2 Spacing of Increments for Auger SamplingThe spacing of increments collected by auger sampling systems is defined in terms of position over the lot.
1.3 It is essential that the inspector have the documentation listed in Section of this practice when conducting an inspection.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 a specific hazard statement, see Section 5.

General Information

• Status: Historical
• Publication Date: 31-Mar-2006
• ICS: 75.160.10 - Solid fuels
• Technical Committee: D05 - Coal and Coke
• Drafting Committee: D05.23 - Sampling

Relations

• Replaces: ASTM D4702-04 - Standard Guide for Quality Management of Mechanical Coal Sampling Systems
• Effective Date: 01-Apr-2006
• Referred By: ASTM D7430/D7430M-22 - Standard Practice for Mechanical Sampling of Coal
• Effective Date: 01-Apr-2006
• Referred By: ASTM D6970-03(2019) - Standard Practice for Collection of Calcined Petroleum Coke Samples for Analysis
• Effective Date: 01-Apr-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D4702–06
Standard Practice for
1
Quality Management of Mechanical Coal Sampling Systems
This standard is issued under the fixed designation D 4702; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope bility of regulatory limitations prior to use. For a specific
hazard statement, see Section 5.
1.1 This practice is applicable to cross-belt, falling stream,
and auger sampling systems.
2. Referenced Documents
1.2 Spacing of increments pertains to the kind of interval
2
2.1 ASTM Standards:
between increments. Intervals can be defined in quantitative
D 121 Terminology of Coal and Coke
terms, such as units of time or mass, or in terms of position
D 2013 Practice for Preparing Coal Samples for Analysis
over the lot.
D 2234/D 2234M Practice for Collection of a Gross Sample
1.2.1 Spacing of Increments for Cross-Belt and Falling
of Coal
Stream Samplers—Cross-beltandfallingstreamtypemechani-
D 4749 Test Method for Performing the Sieve Analysis of
cal sampling systems take increments based on time, either at
Coal and Designating Coal Size
fixed time intervals or at random times during a fixed time
D 4916 Practice for Mechanical Auger Sampling
strata. Some falling stream samplers can take increments based
on equal mass of coal sampled as determined by scales. The
3. Terminology
sections of this practice that pertain to cross-belt and falling
3.1 Definitions—Definitions applicable to this practice are
stream samplers describe procedures for only time-based
listed in Terminology D 121 and Practices D 2013, D 2234/
sampling systems. This time-based inspection guideline will
D 2234M and D 4916.
satisfymostcriteriaformass-basedorcombinationmass-based
andtime-basedsamplingsystems.Ifthereareitemsthatarenot
4. Significance and Use
covered, the inspector should refer to the manufacturer’s
4.1 This practice addresses quality assurance criteria for
literature.
operation of a mechanical coal-sampling system in accordance
1.2.2 Spacing of Increments for Auger Sampling—The
with Practice D 2234/D 2234M, Practice D 2013, and Practice
spacing of increments collected by auger sampling systems is
D 4916. It provides recommendations for performance moni-
defined in terms of position over the lot.
toring, inspection, and maintenance, which are necessary in
1.3 It is essential that the inspector have the documentation
maintaining a sampling system’s capability to consistently
listed in Section 2 of this practice when conducting an
obtain a representative sample.
inspection.
1.4 The values stated in SI units are to be regarded as the
5. Hazards
standard. The values given in parentheses are for information
5.1 Precautions—In addition to other precautions, person-
only.
nel visiting facilities for observation of mechanical sampling
1.5 This standard does not purport to address all of the
system performance should immediately upon arrival report to
safety concerns, if any, associated with its use. It is the
the facility management to inform them of their presence and
responsibility of the user of this standard to establish appro-
the purpose of their visit. The inspector should ask for
priate safety and health practices and determine the applica-
1 2
This practice is under the jurisdiction of ASTM Committee D05 on Coal and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Coke and is the direct responsibility of Subcommittee D05.23 on Sampling. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Current edition approved April 1, 2006. Published May 2006. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1987. Last previous edition approved in 2004 as D 4702 – 04. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4702–06
drawings, specifications, and instructions on the applicable collection to get in phase with the sequence of coal variability.
safety practices and regulations to be followed on the site. Variations in the physical characteristics, such as particle-size
distribution,surfacemoisture,extraneousmatter,andoversized
6. Assessing the Organization and Planning of Sampling
material, can become cyclical and even could be in phase with
Operations
the time-based increment collection.When such cyclical varia-
6.1 It is recommended that inspection personnel meet with
tions occur in the coal stream, the source of the variations
the appropriate personnel responsible for the mechanical sam-
...