prEN ISO 17831-2

SLOVENSKI STANDARD
01-julij-2024
Trdna biogoriva - Določanje mehanske odpornosti peletov in briketov - 2. del:
Briketi (ISO/DIS 17831-2:2024)
Solid biofuels - Determination of mechanical durability of pellets and briquettes - Part 2:
Briquettes (ISO/DIS 17831-2:2024)
Biogene Festbrennstoffe - Bestimmung der mechanischen Festigkeit von Pellets und
Briketts - Teil 2: Briketts (ISO/DIS 17831-2:2024)
Biocombustibles solides - Détermination de la résistance mécanique des granulés et des
briquettes - Partie 2 : Granulés (ISO/DIS 17831-2:2024)
Ta slovenski standard je istoveten z: prEN ISO 17831-2
ICS:
75.160.40 Biogoriva Biofuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 17831-2
ISO/TC 238
Solid biofuels — Determination of
Secretariat: SIS
mechanical durability of pellets and
Voting begins on:
briquettes —
2024-05-24
Part 2:
Voting terminates on:
2024-08-16
Briquettes
Biocombustibles solides — Détermination de la résistance
mécanique des granulés et des briquettes —
Partie 2: Briquettes
ICS: 27.190; 75.160.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 17831-2:2024(en)
DRAFT
ISO/DIS 17831-2:2024(en)
International
Standard
ISO/DIS 17831-2
ISO/TC 238
Solid biofuels — Determination of
Secretariat: SIS
mechanical durability of pellets and
Voting begins on:
briquettes —
Part 2:
Voting terminates on:
Briquettes
Biocombustibles solides — Détermination de la résistance
mécanique des granulés et des briquettes —
Partie 2: Briquettes
ICS: 27.190; 75.160.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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BE CONSIDERED IN THE LIGHT OF THEIR
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NATIONAL REGULATIONS.
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 17831-2:2024(en)
ii
ISO/DIS 17831-2:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 Briquette tester . .2
5.2 Circular sieves .3
5.3 Collecting pan, .3
5.4 Sieve template .3
5.5 Balance .3
6 Sample preparation . 4
7 Procedure . 4
7.1 Tumbling procedure .4
7.2 Sieving procedure .5
8 Calculation of the mechanical durability . 5
9 Performance characteristics . 5
10 Test report . 5
Bibliography . 6

iii
ISO/DIS 17831-2:2024(en)
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
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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 238, Solid biofuels.
This second edition cancels and replaces the first edition (ISO 17831-2:2015), which has been technically
revised.
The main changes are as follows:
— The introduction has been changed;
— A reference to ISO 21945 was included;
— The dimensions of the drum of the briquette tester were changed to more consistent values;
— The description of sieving procedures has been substituted by a reference to ISO 5370;
— The sieves were changed from metal wire mesh sieves to sieves with round perforated plates.
— Editorial changes. A list of all parts in the ISO 17831 series can be found on the ISO website.
A list of all parts in the ISO 17831 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
ISO/DIS 17831-2:2024(en)
Introduction
Compressed solid biomass fuel is usually assigned either as pellets or briquettes, of which pellets usually
have a diameter below 25 mm while for briquettes the diameter is higher (see ISO 17225-1). The mechanical
durability is an important parameter to estimate the tendency to create new fines by abrasion of pellets or
briquettes, respectively, during handling.
To account for the different particle dimensions, it was necessary to define different test apparatuses for the
determination of mechanical durability of pellets and briquettes.

v
DRAFT International Standard ISO/DIS 17831-2:2024(en)
Solid biofuels — Determination of mechanical durability of
pellets and briquettes —
Part 2:
Briquettes
1 Scope
This document defines a method for determination the mechanical durability of briquettes. The mechanical
durability is a measure of the resistance of compressed fuels towards shocks and/or abrasion as a
consequence of handling and transportation.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate
ISO 5370, Solid biofuels — Determination of fines content in pellets
ISO 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Vocabulary
ISO 18134-1, Solid biofuels — Determination of moisture content — Part 1: Reference method
ISO 18134-2, Solid biofuels — Determination of moisture content — Part 2: Simplified method
ISO 18135, Solid Biofuels — Sampling
ISO 21945, Solid biofuels — Simplified sampling method for small scale applications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16559 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
A test portion is subjected to controlled shocks by the briquettes bouncing against each other and against
the walls of a specified rotating test chamber. After tumbling, the test portion is sieved to separate broken
particles. The mechanical durability is expressed as the proportion of the test portion remaining after the
broken particles are removed
...