International Standard
ISO 13909-7:2025
Coal and coke — Mechanical sampling — Part 7: Methods for determining the precision of sampling, sample preparation and testing
Reference number
ISO 13909-7:2025
Edition 3
2025-07
© ISO 2026
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Published (Edition 3, 2025)

ISO 13909-7:2025

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Abstract

This document defines methods for estimating overall precision and for deriving values for primary increment variance which can be used to modify the sampling scheme to change the precision. Methods for checking the variance of sample preparation and testing are also described.

In this document, formulae are developed which link the variables that contribute to overall sampling precision.

General information

  • Status
     : Published
    Publication date
     : 2025-07
    Stage
    : International Standard published [60.60]
  • Edition
     : 3
    Number of pages
     : 42
  • Technical Committee :
    ISO/TC 27/SC 4
    ICS :
    73.040  75.160.10 
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