ISO/FDIS 13909-4
(Main)Coal and coke — Mechanical sampling — Part 4: Preparation of test samples of coal
Coal and coke — Mechanical sampling — Part 4: Preparation of test samples of coal
ISO 13909-4:2016 describes the preparation of samples of coal from the combination of primary increments to the preparation of samples for specific tests.
Charbon et coke — Échantillonnage mécanique — Partie 4: Préparation des échantillons de charbon pour essai
General Information
Relations
Buy Standard
Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/TC 27/SC 4
Coal and coke — Mechanical
Secretariat: SABS
sampling —
Voting begins on:
2025-04-09
Part 4:
Preparation of test samples of coal
Voting terminates on:
2025-06-04
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 27/SC 4
Coal and coke — Mechanical
Secretariat: SABS
sampling —
Voting begins on:
Part 4:
Preparation of test samples of coal
Voting terminates on:
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .v
Introduction .vi
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 General .2
5.2 Combination of increments .2
5.2.1 Time-basis sampling .2
5.2.2 Mass-basis sampling .2
5.3 Combination of samples .3
6 Division . 3
6.1 General .3
6.2 Mechanical methods .11
6.2.1 General .11
6.2.2 Mass of cut .11
6.2.3 Interval between cuts . 12
6.2.4 Division of individual increments . 12
6.2.5 Division of samples.14
6.3 Manual methods . 15
6.3.1 Riffle method . 15
6.3.2 Flattened-heap method .16
6.3.3 Strip-mixing and splitting method .18
7 Reduction . 19
7.1 General .19
7.2 Reduction mills .19
8 Mixing . 19
9 Air-drying . 19
10 Preparation of samples for specific tests .20
10.1 Types of test samples . 20
10.2 Preparation of samples for determination of total moisture only . 20
10.2.1 General . 20
10.2.2 Storage . 22
10.2.3 Sample reduction . 22
10.2.4 Sample division . . . 22
10.3 Preparation of samples for general analysis only . 22
10.3.1 General . 22
10.3.2 Air-drying . 22
10.3.3 Reduction and division . 22
10.4 Common samples .24
10.4.1 General .24
10.4.2 Extraction of moisture sample by mechanical division . 25
10.4.3 Extraction of moisture sample by manual method . 25
10.5 Preparation of size-analysis sample . 26
10.6 Preparation of samples for other tests . 28
11 Reserve sample . .28
12 Design of equipment for preparation .28
12.1 Dividers . 28
12.2 Design of cutters for falling-stream dividers . 28
iii
12.2.1 General . 28
12.2.2 Cutter velocity . 29
12.3 Preparation systems . 29
12.3.1 General . 29
12.3.2 Design criteria . 29
12.3.3 Abnormal operation . 30
12.4 Provision for checking for precision . 30
12.5 Provision for testing for bias . 30
Bibliography .31
iv
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 bo
...
Date: 2025-02-19
Style Definition
...
Formatted: Font: 14 pt, Bold, French (France)
Formatted: French (France)
ISO/TC 27/SC 4/WG 10
Formatted: zzCover large, Adjust space between Latin
and Asian text, Adjust space between Asian text and
Secretariat: SABS
numbers
Date: 2025-03-19 Formatted
...
Coal and coke — Mechanical sampling — —
Formatted: Regular, Font: 16 pt, Bold
Part 4:
Formatted: Regular, Font: 16 pt, Bold
Preparation of test samples of coal
Formatted: Cover Title_A2, Adjust space between Latin
Houille et coke — Échantillonnage mécanique — Partie 4: Charbon — Préparation des échantillons
and Asian text, Adjust space between Asian text and
numbers
pour essai
FDIS stage
Formatted: Left: 1.5 cm, Right: 1.5 cm, Gutter: 0 cm,
Header distance from edge: 1.27 cm
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
Formatted: Adjust space between Latin and Asian text,
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
Adjust space between Asian text and numbers
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Formatted: Default Paragraph Font
at the address below or ISO'sISO’s member body in the country of the requester.
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Formatted: zzCopyright address, Adjust space between
Phone: + 41 22 749 01 11
Latin and Asian text, Adjust space between Asian text
Email: E-mail: copyright@iso.org
and numbers
Website: www.iso.org
Formatted: French (France)
Published in Switzerland.
Formatted: zzCopyright address, Adjust space between
Latin and Asian text, Adjust space between Asian text
and numbers
ii
Contents Page
Foreword . iv
Introduction . 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 General . 2
5.2 Combination of increments . 2
5.3 Combination of samples . 4
6 Division . 4
6.1 General . 4
6.2 Mechanical methods . 12
6.3 Manual methods . 18
7 Reduction . 25
7.1 General . 25
7.2 Reduction mills . 25
8 Mixing . 25
9 Air-drying . 25
10 Preparation of samples for specific tests . 26
10.1 Types of test samples . 26
10.2 Preparation of samples for determination of total moisture only . 26
10.3 Preparation of samples for general analysis only . 29
10.4 Common samples . 32
10.5 Preparation of size-analysis sample . 35
10.6 Preparation of samples for other tests . 39
11 Reserve sample . 39
12 Design of equipment for preparation. 39
12.1 Dividers . 39
12.2 Design of cutters for falling-stream dividers . 39
12.3 Preparation systems . 40
12.4 Provision for checking for precision . 41
12.5 Provision for testing for bias . 41
Bibliography . 42
iii
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
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--4:2016), which has been technically
revised.
The main changes are as follows:
— — the title has been modified and aligned with the rest of the ISO 13909 series;
— — the Scopescope has been revised to specifically refer to coal;
— — the references have been updated;
— — the legend for Formula (3)Formula (3) has 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.
iv
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, or both. Samples maycan 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.
v
Formatted
...
Formatted
...
Formatted
...
Coal and coke — Mechanical sampling — —
Formatted
...
Formatted
...
Part 4:
Formatted
...
Preparation of test samples of coal
Formatted
...
Formatted
...
1 Scope
Formatted
...
This document describes the preparation of samples of coal from the combination of primary increments to
Formatted
...
the preparation of samples for specific tests.
Formatted
...
2 Normative references Formatted
...
Formatted
...
The following documents, in whole or in part, are normatively referenced in this document and are
Formatted
...
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
Formatted
...
Formatted
...
ISO 589, Hard coal — Determination of total moisture
Formatted
...
ISO 3310--1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
Formatted
...
Formatted
...
ISO 13909--1, Coal and coke — Mechanical sampling — Part 1: General introduction
Formatted
...
ISO 13909--2, Coal and coke — Mechanical sampling — Part 2: Sampling of coal from moving streams
Formatted
...
Formatted
ISO 13909--3, Coal and coke — Mechanical sampling — Part 3: Sampling of coal from stationary lots
...
Formatted
...
ISO 13909--7, Coal and coke — Mechanical sampling — Part 7: Methods for determining the precision of
Formatted
...
sampling, sample preparation and testing
Formatted
...
ISO 13909--8, Coal and coke — Mechanical sampling — Part 8: Methods of testing for bias
Formatted
...
Formatted
...
3 Terms and definitions
Formatted
...
For the purposes of this document, the terms and definitions given in ISO 13909--1 apply.
Formatted
...
Formatted
ISO and IEC maintain terminology databases for use in standardization at the following addresses: .
Formatted
...
— — ISO Online browsing platform: available at https://www.iso.org/obp
Formatted
...
— — IEC Electropedia: available at https://www.electropedia.org/ Formatted
...
Formatted
...
4 Precision of sample preparation
Formatted
...
From the formulae given in ISO 13909--7, the estimated absolute value of the precision of the result obtained Formatted
...
for the lot at the 95 % confidence level, P , for sampling is given by Formula (1)Formula (1)::
L
Formatted
...
Formatted
(1) .
Formatted
...
𝑉𝑉
I
+𝑉𝑉 Formatted
PT .
𝑛𝑛
�
𝑃𝑃 = 2 (1)
L
𝑚𝑚
Formatted
...
Formatted
...
where
Formatted
...
PL is the estimated overall precision of sampling, sample preparation and testing for the lot at a
Formatted Table
95 % confidence level, expressed as a percentage absolute;
VI is the primary increment variance;
Formatted: Table body (+), Adjust space between Latin
and Asian text, Adjust space between Asian text and
V is the preparation and testing variance for both off-line and on-line systems;
PT
numbers
n is the number of increments to be taken from a sub-lot;
Formatted: Table body (+), Adjust space between Latin
and Asian text, Adjust space between Asian text and
m is the number of sub-lots in the lot.
numbers
The procedures given in this document are desig
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.