National foreword

This British Standard is the UK implementation of ISO 13909‑4:2016. It supersedes BS ISO 13909‑4:2001 which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee PTI/16, Solid mineral fuels.

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

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

© The British Standards Institution 2016.

Published by BSI Standards Limited 2016

ISBN 978 0 580 83177 5

ICS 73.040

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 30 June 2016.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

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 documents 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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword — Supplementary information.

The committee responsible for this document is ISO/TC 27, Solid mineral fuels, Subcommittee SC 4, Sampling.

This second edition cancels and replaces the first edition ( ISO 13909‑4:2001), which has been technically revised.

ISO 13909 consists of the following parts, under the general title Hard coal and coke — Mechanical sampling:

Part 1: General introduction
Part 2: Coal — Sampling from moving streams
Part 3: Coal — Sampling from stationary lots
Part 4: Coal — Preparation of test samples
Part 5: Coke — Sampling from moving streams
Part 6: Coke — Preparation of test samples
Part 7: Methods for determining the precision of sampling, sample preparation and testing
Part 8: Methods of testing for bias

This corrected version of ISO 13909-4:2016 incorporates the following correction:

the wrong Figure 6 has been replaced by the correct one.

Introduction

The objective of sample preparation is to prepare one or more test samples from the primary increments for subsequent analysis. The requisite mass and particle size of the test sample depend on the test to be carried out.

The process of sample preparation may involve constitution of samples, reduction, division, mixing and drying, or all or a combination of these.

Primary increments may be prepared individually as test samples or combined to constitute samples either as taken or after having been prepared by reduction and/or division. Samples may either be prepared individually as test samples or combined on a weighted basis to constitute a further sample.

When difficulty in handling the coal or coals being sampled is expected at a particular stage in sample preparation, or if there is a likelihood of losing moisture by evaporation, it is necessary to withdraw the sample or increment from the on-line system at the stage immediately prior to the point of difficulty and proceed off-line.

1 Scope

This part of ISO 13909 describes the preparation of samples of coal from the combination of primary increments to the preparation of samples for specific tests.

2 Normative references

3 Terms and definitions

4 Precision of sample preparation

5 Constitution of a sample

5.1 Introduction

5.2 Combination of increments

5.3 Combination of samples

6 Division

6.1 General

6.2 Mechanical methods

6.3 Manual methods

7 Reduction

7.1 General

7.2 Reduction mills

8 Mixing

9 Air-drying

10 Preparation of samples for specific tests

10.1 Types of test samples

10.2 Preparation of samples for determination of total moisture only

10.3 Preparation of samples for general analysis only

10.4 Common samples

10.5 Preparation of size-analysis sample

10.6 Preparation of samples for other tests

11 Reserve sample

12 Design of equipment for preparation

12.1 Dividers

12.2 Design of cutters for falling-stream dividers

12.3 Preparation systems

12.4 Provision for checking for precision

12.5 Provision for testing for bias

Bibliography

BS ISO 13909-4:2016

Hard coal and coke. Mechanical sampling - Coal. Preparation of test samples

Published:

30 Jun 2016

Withdrawn:

24 Jul 2025