Oxygen reduction systems for fire prevention — Design, installation, planning and maintenance

This document specifies minimum requirements and defines the specifications governing the design, installation and maintenance of fixed oxygen reduction systems with oxygen reduced air for fire prevention in buildings and industrial production plants. It also applies to the extension and modification of existing systems. This document applies to oxygen reduction systems using nitrogen-enriched-air which are designed for continual oxygen reduction in enclosed spaces. NOTE Nitrogen is, today, the most suitable gas to be used for oxygen reduction. For other gases, this document can be used as a reference. This document does not apply to: — oxygen reduction systems that use water mist or combustion gases; — explosion suppression systems; — explosion prevention systems, in case of chemicals or materials containing their own supply of oxygen, such as cellulose nitrate; — fire extinguishing systems using gaseous extinguishing agents; — inertization of portable containers; — systems in which oxygen levels are reduced for reasons other than fire prevention (e.g. steel processing in the presence of inert gas to avoid the formation of oxide film); — inerting required during repair work on systems or equipment (e.g. welding) in order to eliminate the risk of fire or explosion. In addition to the conditions for the actual oxygen reduction system and its individual components, this document also covers certain structural specifications for the protected area. The space protected by an oxygen reduction system is a controlled and continuously monitored indoor climate for extended occupation. This document does not cover unventilated confined spaces that can contain hazardous gases.

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General Information

Status
Published
Publication Date
01-Sep-2019
Current Stage
9020 - International Standard under periodical review
Start Date
15-Jul-2024
Completion Date
15-Jul-2024
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ISO 20338:2019 - Oxygen reduction systems for fire prevention -- Design, installation, planning and maintenance
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INTERNATIONAL ISO
STANDARD 20338
First edition
2019-09
Oxygen reduction systems for fire
prevention — Design, installation,
planning and maintenance
Reference number
©
ISO 2019
© ISO 2019
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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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 System requirements . 3
4.1 General . 3
4.2 Personnel safety . 3
4.3 Effectiveness and application . 4
4.4 Alarm organization and emergency plan . 4
5 Design . 5
5.1 Qualification of the designer . 5
5.2 Fire protection concept . 5
5.3 Structural specifications for the protected area . 5
5.4 Oxygen concentration . 5
5.5 Oxygen reduction to prevent fire . 6
5.6 Safety margins . 6
5.7 Oxygen reduced air quantity . 9
5.7.1 Continuous oxygen reduction . 9
5.7.2 Emergency plan . 9
5.7.3 Oxygen reduced air .10
5.7.4 Fault signals .10
5.8 Technical areas .11
5.8.1 Technical area for control panel .11
5.8.2 Technical area for reduced oxygen air generation.11
6 Distribution pipework .12
6.1 Pipework .12
6.2 Pipe supports .12
6.3 Components in the pipework .12
7 Monitoring the oxygen concentration .13
8 Alarms and notifications .14
9 Control equipment .15
9.1 Function .15
9.2 Requirements .16
9.3 Electrical power supply .16
9.4 Electrical cabling installations.16
9.5 Data recording .16
10 System operation.17
10.1 Instruction and training of personnel .17
10.2 Inspections .17
10.3 Operations log.17
10.4 Further obligations .17
11 Maintenance .18
12 Documentation .18
13 Installation .19
13.1 Qualification of the installer .19
13.2 General specifications — Installation .19
Annex A (normative) Ignition thresholds for oxygen reduction using nitrogen-enriched air
in fire prevention .20
Bibliography .24
iv © ISO 2019 – All rights reserved

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 ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 8, Gaseous media and firefighting systems using gas.
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.
Introduction
Oxygen reduction systems are designed to prevent fires from starting or spreading, by means of
the introduction of oxygen reduced air and creating an atmosphere in an area which is having lower
permanent oxygen concentration in respect to ambient conditions. Oxygen reduction systems are
not designed to extinguish fires. The design and installation are based on detailed knowledge of the
protected area, its occupancy and the materials in question. It is important to suit the fire protection
measures to the hazard as a whole.
vi © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 20338:2019(E)
Oxygen reduction systems for fire prevention — Design,
installation, planning and maintenance
1 Scope
This document specifies minimum requirements and defines the specifications governing the
design, installation and maintenance of fixed oxygen reduction systems with oxygen reduced air
for fire prevention in buildings and industrial production plants. It also applies to the extension and
modification of existing systems.
This document applies to oxygen reduction systems using nitrogen-enriched-air which are designed for
continual oxygen reduction in enclosed spaces.
NOTE Nitrogen is, today, the most suitable gas to be used for oxygen reduction. For other gases, this
document can be used as a reference.
This document does not apply to:
— oxygen reduction systems that use water mist or combustion gases;
— explosion suppressi
...

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