ISO 13909-6:2016

DRAFT INTERNATIONAL STANDARD
ISO/DIS 13909-6
ISO/TC 27/SC 4 Secretariat: SABS
Voting begins on: Voting terminates on:
2014-07-08 2014-10-08
Hard coal and coke — Mechanical sampling —
Part 6:
Coke — Preparation of test samples
Houille et coke — Échantillonnage mécanique —
Partie 6: Coke — Préparation des échantillons pour essai
ICS: 75.160.10
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ISO/DIS 13909-6:2014(E)
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2014

ISO/DIS 13909-6:2014(E)
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ii © ISO 2014 – All rights reserved

ISO/CD 13909-6
Contents Page
Foreword .v
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Precision of sample preparation.1
5 Constitution of a sample.2
5.1 Introduction.2
5.2 Combination of increments.2
5.3 Combination of samples.3
6 Division.3
6.1 General .3
6.2 Mechanical methods .4
6.2.1 General .4
6.2.2 Mass of cut.4
6.2.3 Interval between cuts.10
6.2.4 Division of individual increments .11
6.2.5 Minimum mass of divided increment .11
6.2.6 Division of samples.11
6.3 Manual methods .12
6.3.1 General .12
6.3.2 Riffle method.12
6.3.3 Flattened-heap method .12
6.3.4 Strip-mixing and splitting method .15
7 Preparation of samples for specific tests .16
7.1 Types of test sample .16
7.2 Preparation of samples for determining total moisture .16
7.2.1 General .16
7.2.2 Procedure.16
7.2.3 Wet samples.16
7.2.4 Reduction of total moisture test sample.17
7.2.5 Division.17
7.2.6 Determination of moisture.17
7.2.7 Reserve sample .17
7.3 Preparation of sample for general analysis.18
7.3.1 General .18
7.3.2 Segregation errors .18
7.3.3 Reduction .18
7.3.4 Division.18
7.3.5 Preparation Errors.20
7.3.6 Storage .20
7.4 Physical test sample .20
7.5 Samples for special properties .20
8 Design of equipment for preparation .20
8.1 Dividers.20
8.2 Design of cutters for falling-stream dividers.21
8.2.1 General .21
8.2.2 Cutter velocity.21
8.3 Crushers.22
ISO/CD 13909-6
8.3.1 General. 22
8.3.2 Examples of crushers . 22
8.4 Preparation systems . 22
8.4.1 General. 22
8.4.2 Design criteria. 23
8.4.3 Normal operation . 23
8.4.4 Abnormal operation. 23
8.4.5 Provision for checking for precision . 23
8.4.6 Provision for testing for bias. 23
Bibliography………………………………………………………………………………………………………….….25
iv © ISO 2008 – All rights reserved

ISO/CD 13909-6
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for
voting. Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 13909 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 13909-6 was prepared by Technical Committee ISO/TC 27, Solid mineral
fuels, Subcommittee SC 4, Sampling.
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
ISO/CD 13909-6
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 samples depend on the test to be
carried out.
Examples of tests which require different masses are Shatter Index (ISO 616), Micum and Irsid Index (ISO 556),
reactivity tests (ISO 18894), density (ISO 567, ISO 1013) and size distribution (ISO 778, ISO 2355).
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.
vi © ISO 2008 – All rights reserved

DRAFT INTERNATIONAL STANDARD ISO/CD 13909-6
Hard coal and coke – Mechanical sampling – Part 6: Coke –
Preparation of test samples
1 Scope
This part of ISO 13909 describes the preparation of samples of coke from the combination of primary
increments to the preparation of samples for specific tests.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute
provisions of this part of ISO 13909. For dated references, subsequent amendments to, or revisions of, any of
these publications do not apply. However, parties to agreements based on this part of ISO 13909 are
encouraged to investigate the possibility of applying the most recent editions of the normative documents
indicated below. For undated references, the latest edition of the normative document referred to applies.
Members of ISO and IEC maintain registers of currently valid International Standards.
ISO 579:1999, Coke — Determination of total moisture.
ISO 687:1974, Coke — Determination of moisture in the analysis sample.
ISO
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