ISO/FDIS 7293

Forestry machinery -- Portable chain-saws -- Engine performance and fuel consumption

Machines forestières -- Scies à chaîne portatives -- Puissance et consommation de carburant du moteur

General Information

• Status: Published
• ICS: 65.060.80 - Forestry equipment
• Technical Committee: ISO/TC 23/SC 17 - Manually portable (hand-held) powered lawn and garden equipment and forest machinery
• Drafting Committee: ISO/TC 23/SC 17/WG 4 - Safety
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 22-Jul-2021
• Completion Date: 22-Jul-2021

RELATIONS

• Revised: ISO 7293:1997 - Forestry machinery -- Portable chain saws -- Engine performance and fuel consumption
• Effective Date: 23-Apr-2020

Standards Content (sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 7293
ISO/TC 23/SC 17
Forestry machinery — Portable chain-
Secretariat: SIS
saws — Engine performance and fuel
Voting begins on:
2021­07­22 consumption
Voting terminates on:
Machines forestières — Scies à chaîne portatives — Puissance et
2021­09­16
consommation de carburant du moteur
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
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 7293:2021(E)
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. ISO 2021
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ISO/FDIS 7293:2021(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

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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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Phone: [phone]
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Published in Switzerland
ii © ISO 2021 – All rights reserved
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ISO/FDIS 7293:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative reference ......................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Accuracy of measurements ........................................................................................................................................................................ 1

5 Power correction factors .............................................................................................................................................................................. 2

5.1 Definition ..................................................................................................................................................................................................... 2

5.2 Reference atmospheric conditions ........................................................................................................................................ 2

5.3 Test atmospheric conditions ....................................................................................................................................................... 2

5.4 Determination of correction factor α ................................................................................................................................... 2

6 Conditions of measurement ...................................................................................................................................................................... 3

7 Operating method ............................................................................................................................................................................................... 3

7.1 General ........................................................................................................................................................................................................... 3

7.2 Procedure .................................................................................................................................................................................................... 4

7.2.1 Peak power and peak torque engine speed determination ........................................................ 4

7.2.2 Determination of the power curve and fuel consumption curve ........................................... 4

8 Test report ................................................................................................................................................................................................................... 4

© ISO 2021 – All rights reserved iii
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ISO/FDIS 7293:2021(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 non­governmental, 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 ISO/TC 23, Tractors and machinery for agriculture

and forestry, Subcommittee SC 17, Manually portable forest machinery.

This third edition cancels and replaces the second edition (ISO 7293:1997), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— the normative references has been updated:

— the mandatory terms and definitions clause has been inserted and subsequent clauses have been

renumbered;
— the "Apparatus" clause has been replaced with "Accuracy of measurements";

— the "Test conditions" clause has been replaced with "Power correction factors";

— the conditions of measurement has been revised;
— the operating method has been revised;
— a new Table 1, Sample test data record sheet, has been added.

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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ISO/FDIS 7293:2021(E)
Introduction
This document is a type-C standard as stated in ISO 12100.

This document is of relevance, in particular, for the following stakeholder groups representing the

market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);

— health and safety bodies (regulators, accident prevention organisations, market surveillance, etc.)

Others can be affected by the level of machinery safety achieved with the means of the document by the

above­mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);

— machine users/employees (e.g. trade unions, organizations for people with special needs);

— service providers, e. g. for maintenance (small, medium and large enterprises);

— consumers (in case of machinery intended for use by consumers).

The above-mentioned stakeholder groups have been given the possibility to participate at the drafting

process of this document.

The machinery concerned and the extent to which hazards, hazardous situations or hazardous events

are covered are indicated in the scope of this document.

When requirements of this type-C standard are different from those which are stated in type A or type

B standards, the requirements of this type-C standard take precedence over the requirements of the

other standards for machines that have been designed and built according to the requirements of this

type C standard.
© ISO 2021 – All rights reserved v
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 7293:2021(E)
Forestry machinery — Portable chain-saws — Engine
performance and fuel consumption
1 Scope
This document specifi
...