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ASTM D 7430 : 2008 : REV A : EDT 1

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Practice for Mechanical Sampling of Coal
Available format(s)

Hardcopy , PDF

Superseded date

11-11-2014

Language(s)

English

Published date

01-10-2008

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

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1.2 Part AMechanical Collection and Within-System Preparation of a Gross Sample of Coal from Moving StreamsCovers 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

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1.3 Part BMechanical Auger SamplingDescribes 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

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1.4 Part CQuality Management of Mechanical Coal Sampling SystemsIs 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 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.

1.4.3 Spacing of Increments for Auger SamplingThe 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 this standard.

Part D

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1.5 Part DBias Testing of a Mechanical Coal Sampling SystemPresents sample collection and statistical evaluation procedures for testing mechanical sampling systems (including auger systems), subsystems, and individual system components for bias. It is the responsibility of the user of this practice to select the appropriate procedure for a specific sampling situation.

1.5.1 Part D does not purport to define an absolute bias. Bias defined by this practice is the difference between the population mean of the mechanical sampler test results and the accepted reference value.

1.5.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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 a specific hazard statement, see section 16.1.

Committee
D 05
DocumentType
Standard Practice
Pages
40
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

ASTM D 2234/D2234M : 2017 Standard Practice for Collection of a Gross Sample of Coal
ASTM D 409/D409M : 2016 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
ASTM D 3172 : 2013 Standard Practice for Proximate Analysis of Coal and Coke
ASTM D 3176 : 2015 Standard Practice for Ultimate Analysis of Coal and Coke
ASTM D 6543 : 2017 : REV A Standard Guide to the Evaluation of Measurements Made by Online Coal Analyzers
ASTM D 3302/D3302M : 2017 Standard Test Method for Total Moisture in Coal
ASTM D 121 : 2015 Standard Terminology of Coal and Coke
ASTM D 8145 : 2018 Standard Practice for Sampling of Green Petroleum Coke

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