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Full Description

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.

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-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 this standard.

Part D

1.5 Part D-Bias Testing of a Mechanical Coal Sampling System-Presents 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.

 

Document History

  1. ASTM D7430/D7430M-22


    Standard Practice for Mechanical Sampling of Coal

    • Most Recent
  2. ASTM D7430/D7430M-21


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  3. ASTM D7430/D7430M-20


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  4. ASTM D7430-18ae1


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  5. ASTM D7430-18a


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  6. ASTM D7430-18


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  7. ASTM D7430-17


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  8. ASTM D7430-16be1


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  9. ASTM D7430-16b


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  10. ASTM D7430-16


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  11. ASTM D7430-16a


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  12. ASTM D7430-15b


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  13. ASTM D7430-15a


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  14. ASTM D7430-15


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  15. ASTM D7430-14

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    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  16. ASTM D7430-13


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  17. ASTM D7430-12b


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  18. ASTM D7430-12a


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  19. ASTM D7430-12


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  20. ASTM D7430-11ae1


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  21. ASTM D7430-11a


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  22. ASTM D7430-11


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  23. ASTM D7430-10b


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  24. ASTM D7430-10a


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  25. ASTM D7430-10


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  26. ASTM D7430-09


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  27. ASTM D7430-08ae1


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  28. ASTM D7430-08a


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version
  29. ASTM D7430-08


    Standard Practice for Mechanical Sampling of Coal

    • Historical Version