Solid biofuels - Fuel specifications and classes - Part 4: Graded wood chips (ISO 17225-4:2021)

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.

Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 4: Klassifizierung von Holzhackschnitzel (ISO 17225-4:2021)

Dieses Dokument legt die qualitätsbezogenen Brennstoffklassen und  spezifikationen für klassifizierte Holz¬hackschnitzel fest. Dieses Dokument umfasst nur Holzhackschnitzel, die aus folgenden Rohmaterialien her¬gestellt wurden (siehe ISO 17225 1:2021, Tabelle 1):
- 1.1 Wald- und Plantagenholz sowie anderes naturbelassenes Holz;
- 1.2 Industrie-Restholz;
- 1.3.1 Chemisch unbehandeltes Gebrauchtholz.
Dieses Dokument behandelt nur Holzhackschnitzel, die mithilfe von scharfen Werkzeugen hergestellt wurden, und behandelt kein Schredderholz, das mithilfe von stumpfen Werkzeugen hergestellt wurde.

Biocombustibles solides - Classes et spécifications des combustibles - Partie 4: Classes de plaquettes de bois (ISO 17225-4:2021)

Trdna biogoriva - Specifikacije goriv in razredi - 4. del: Razvrstitev lesnih sekancev (ISO 17225-4:2021)

General Information

Status
Published
Public Enquiry End Date
03-May-2020
Publication Date
15-Apr-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
24-Mar-2021
Due Date
29-May-2021
Completion Date
16-Apr-2021

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SLOVENSKI STANDARD
SIST EN ISO 17225-4:2021
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
SIST EN ISO 17225-4:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 17225-4:2021
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SIST EN ISO 17225-4:2021
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.
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SIST EN ISO 17225-4:2021
EN ISO 17225-4:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 17225-4:2021
EN ISO 17225-4:2021 (E)
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.
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SIST EN ISO 17225-4:2021
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SIST EN ISO 17225-4:2021
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
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SIST EN ISO 17225-4:2021
ISO 17225-4:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
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
ii © ISO 2021 – All rights reserved
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SIST EN ISO 17225-4:2021
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 2021 – All rights reserved iii
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SIST EN ISO 17225-4:2021
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
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SIST EN ISO 17225-4:2021
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);
- 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.
© ISO 2021 – All rights reserved v
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SIST EN ISO 17225-4:2021
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SIST EN ISO 17225-4:2021
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 — Determi
...

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