EN ISO 17225-4:2021

SLOVENSKI STANDARD
01-maj-2021
Nadomešča:
SIST EN ISO 17225-4:2014
Trdna biogoriva - Specifikacije goriv in razredi - 4. del: Razvrstitev lesnih sekancev
(ISO 17225-4:2021)
Solid biofuels - Fuel specifications and classes - Part 4: Graded wood chips (ISO 17225-
4:2021)
Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 4: Klassifizierung
von Holzhackschnitzel (ISO 17225-4:2021)
Biocombustibles solides - Classes et spécifications des combustibles - Partie 4: Classes
de plaquettes de bois (ISO 17225-4:2021)
Ta slovenski standard je istoveten z: EN ISO 17225-4:2021
ICS:
75.160.40 Biogoriva Biofuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17225-4
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 27.190; 75.160.40 Supersedes EN ISO 17225-4:2014
English Version
Solid biofuels - Fuel specifications and classes - Part 4:
Graded wood chips (ISO 17225-4:2021)
Biocombustibles solides - Classes et spécifications des Biogene Festbrennstoffe - Brennstoffspezifikationen
combustibles - Partie 4: Classes de plaquettes de bois und -klassen - Teil 4: Klassifizierung von
(ISO 17225-4:2021) Holzhackschnitzel (ISO 17225-4:2021)
This European Standard was approved by CEN on 8 January 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17225-4:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17225-4:2021) has been prepared by Technical Committee ISO/TC 238 "Solid
biofuels" in collaboration with Technical Committee CEN/TC 335 “Solid biofuels” the secretariat of
which is held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2021, and conflicting national standards
shall be withdrawn at the latest by September 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 17225-4:2014.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 17225-4:2021 has been approved by CEN as EN ISO 17225-4:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 17225-4
Second edition
2021-02
Solid biofuels — Fuel specifications
and classes —
Part 4:
Graded wood chips
Biocombustibles solides — Classes et spécifications des
combustibles —
Partie 4: Classes de plaquettes de bois
Reference number
ISO 17225-4:2021(E)
©
ISO 2021
ISO 17225-4:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 17225-4:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Specification of graded wood chips. 3
Annex A (informative) General guidelines for bulk density of graded wood chips .7
Bibliography . 8
ISO 17225-4:2021(E)
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 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 TC238, Solid biofuels.
This second edition cancels and replaces the first edition (ISO 17225-4:2014), which has been technically
revised. The main changes compared to the previous edition are as follows:
— particle size distribution classification updated;
— moisture and ash content classes updated;
— Annex A updated.
A list of all parts in the ISO 17225 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 2021 – All rights reserved

ISO 17225-4:2021(E)
Introduction
The objective of the ISO 17225 series is to provide unambiguous and clear classification principles for
solid biofuels; to serve as a tool to enable efficient trading of solid biofuels; to enable good understanding
between seller and buyer as well as a tool for communication with equipment manufacturers. It also
[2]
facilitates authority permission procedures and reporting .
This document supports the use of graded wood chips for small and medium residential, commercial
and public building applications.
Depending on the type of energy conversion technology used (boilers, heaters, gasifiers, etc., the
tolerances for a particular quality of wood chips will be different.
Scales of applications and their typical operation range:
- below 100 kW (Residential);
- from 75 to 500 kW (Small; e.g. residential, public and commercial buildings);
- from 500 kW to 1,5 MW (Medium; public and commercial buildings);
- 1,5 MW to 5 MW (Large; small industrial facilities and district heating);
1)
- over 5 MW (Industrial; recommended to use 'ISO 17225-1 or ISO/DIS 17225-9 )
The scale used for grouping the applications utilizing wood chips is for illustration only and in practice,
some overlaps between the applications and the scales are expected.
The residential, small and medium commercial and public building applications require high quality
fuel for the following reasons:
• Small-scale equipment usually does not have advanced controls and flue gas cleaning.
• Appliances are not generally managed by professional heating engineers.
• Appliances are often located in residential and populated districts.
[1]
NOTE 1 Wood chips produced according to this document can be used in boilers tested according to EN 303–5 .
NOTE 2 For individual contracts and industrial use, ISO 17225-1 or ISO/DIS 17225-9 can be used.
Although this document can be obtained separately, it requires a general understanding of the
standards based on and supporting ISO 17225-1. It is recommended to obtain and use ISO 17225-1 in
conjunction with this document.
1) Under preparation. Stage at the time of publication: ISO/DIS 17225-9:2021.
INTERNATIONAL STANDARD ISO 17225-4:2021(E)
Solid biofuels — Fuel specifications and classes —
Part 4:
Graded wood chips
1 Scope
This document determines the fuel quality classes and specifications of graded wood chips. This
document covers only wood chips produced from the following raw materials (see ISO 17225-1:2021,
Table 1):
• 1.1 Forest, plantation and other virgin wood;
• 1.2 By-products and residues from wood processing industry;
• 1.3.1 Chemically untreated used wood.
This document covers only wood chips, which are produced with sharp tools, and does not cover hog
fuel, which is produced with blunt tools.
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 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Terminology, definitions and descriptions
ISO 16948, Solid biofuels — Determination of total content of carbon, hydrogen and nitrogen
ISO 16968, Solid biofuels — Determination of minor elements
ISO 16994, Solid biofuels — Determination of total content of sulfur and chlorine
ISO 17225-1, Solid biofuels — Fuel specifications and classes — Part 1: General requirements
ISO 17827-1, Solid biofuels — Determination of particle size distribution for uncompressed fuels — Part 1:
Oscillating screen method using sieves with apertures of 3,15 mm and above
ISO 18122, Solid biofuels — Determination of ash content
ISO 18134-2, Solid biofuels — Determination of moisture content — Oven dry method — Part 2: Total
moisture — Simplified method
ISO 18135, Solid Biofuels — Sampling
ISO 21945, Solid biofuels — Simpli
...