National foreword

This British Standard is the UK implementation of ISO 13909‑2:2025. It supersedes BS ISO 13909‑2:2016, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee W/-, Miscellaneous Standards.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2025.

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

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This document was prepared by Technical Committee ISO/TC 27, Coal and coke, Subcommittee SC 4, Sampling.

This third edition cancels and replaces the second edition (ISO 13909‑2:2016), which has been technically revised.

The main changes are as follows:

the title has been changed to “Coal and coke” and aligned with the rest of the ISO 13909 series;
the scope has been revised to specifically refer to coal;
the calculation of number of sub-lots and increments has been updated;
the references have been updated.

A list of all parts in the ISO 13909 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

1 Scope

This document specifies procedures and requirements for the design and establishment of mechanical samplers for the sampling of coal from moving streams and describes the methods of sampling used.

It does not cover mechanical sampling from stationary lots, which is dealt with in ISO 13909‑3.

2 Normative references

3 Terms and definitions

4 Establishing a sampling scheme

4.1 General

4.2 Design of the sampling scheme

4.3 Precision of results

4.4 Minimum mass of sample

4.5 Mass of primary increment

4.6 Size analysis

5 Methods of sampling

5.1 General

5.2 Time-basis sampling

5.3 Mass-basis sampling

5.4 Stratified random sampling

5.5 Reference sampling

6 Design of mechanical samplers

6.1 Safety

6.2 Information

6.3 Basic requirements

6.4 Location of sampling equipment

6.5 Provision for checking precision

6.6 Provision for testing for bias

6.7 General requirements for designing mechanical samplers

6.8 Design of falling-stream-type samplers

6.9 Cross-belt-type primary samplers

6.10 Maintenance and checking of sampling equipment

7 Handling and storage of samples

8 Sample preparation

9 Bias

9.1 Minimization of bias

9.2 Checking for precision and bias

10 Verification

Bibliography

BS ISO 13909-2:2025

Coal and coke. Mechanical sampling - Sampling of coal from moving streams

Current

Published:

31 Jul 2025