ISO 14520-10:2016

Gaseous fire-extinguishing systems — Physical properties and system design — Part 10: HFC 23 extinguishant

ISO 14520-10:2016 contains specific requirements for gaseous fire-extinguishing systems, with respect to the HFC 23 extinguishant. It includes details of physical properties, specification, usage and safety aspects and is applicable to systems operating at a nominal pressure of 41 bar without nitrogen superpressurization and 70 bar superpressurized with nitrogen.

Systèmes d'extinction d'incendie utilisant des agents gazeux — Propriétés physiques et conception des systèmes — Partie 10: Agent extincteur HFC 23

General Information

• Status: Withdrawn
• Publication Date: 27-Sep-2016
• Withdrawal Date: 27-Sep-2016
• ICS: 13.220.10 - Fire-fighting
• Technical Committee: ISO/TC 21/SC 8 - Gaseous media and firefighting systems using gas
• Drafting Committee: ISO/TC 21/SC 8/WG 6 - Physical properties and system design (extinguishants CF3I, FK-5-1-12, HCFC Blend A, HFC 125, HFC 227ea, HFC 23, HFC 236fa)
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 02-Jul-2019

Relations

• Revised: ISO 14520-10:2019 - Gaseous fire-extinguishing systems — Physical properties and system design — Part 10: HFC 23 extinguishant
• Effective Date: 23-Sep-2017
• Revises: ISO 14520-10:2005 - Gaseous fire-extinguishing systems — Physical properties and system design — Part 10: HFC 23 extinguishant
• Effective Date: 03-Oct-2009

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14520-10
Third edition
2016-10-01
Gaseous fire-extinguishing systems —
Physical properties and system
design —
Part 10:
HFC 23 extinguishant
Systèmes d’extinction d’incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 10: Agent extincteur HFC 23
Reference number
ISO 14520-10:2016(E)
©
ISO 2016

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ISO 14520-10:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

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ISO 14520-10:2016(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Characteristics and uses . 1
4.1 General . 1
4.2 Use of HFC 23 systems. 2
5 Safety of personnel . 6
6 System design . 6
6.1 Fill density. 6
6.2 Superpressurization . 7
6.3 Extinguishant quantity . 7
7 Environmental properties . 9
© ISO 2016 – All rights reserved iii

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ISO 14520-10:2016(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 on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 21, Equipment for fire protection and fire fighting,
Subcommittee SC 8, Gaseous media and fire fighting systems using gas.
This third edition cancels and replaces the second edition (ISO 14520-10:2005), which has been
technically revised with the following changes:
— added reference to Table 8 and Table 9 for 41 bar and 70 bar systems in 6.1;
— added Table 9 for 70 bar storage container characteristics data;
— added Figure 2, pressure vs temperature chart for 70 bar system;
— added Clause 7.
A list of all parts in the ISO 14520 series can be found on the ISO website.
iv © ISO 2016 – All rights reserved

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INTERNATIONAL STANDARD ISO 14520-10:2016(E)
Gaseous fire-extinguishing systems — Physical properties
and system design —
Part 10:
HFC 23 extinguishant
1 Scope
This document contains specific requirements for gaseous fire-extinguishing systems, with respect
to the HFC 23 extinguishant. It includes details of physical properties, specification, usage and safety
aspects and is applicable to systems operating at a nominal pressure of 41 bar without nitrogen
superpressurization and 70 bar superpressurized with nitrogen.
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 14520-1:2015, Gaseous fire-extinguishing systems — Physical properties and system design —
Part 1: General requirements.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14520-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Characteristics and uses
4.1 General
Extinguishant HFC 23 shall comply with the specification shown in Table 1.
HFC 23 is a colourless, almost odourless, electrically non-conductive gas with a density approximately
2,4 times that of air.
The physical properties are shown in Table 2.
HFC 23 extinguishes fires mainly by physical means, also by some chemical means.
© ISO 2016 – All rights reserved 1

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ISO 14520-10:2016(E)

Table 1 — Specification for HFC 23
Property Requirement
Purity 99,6 % (mol/mol), min.
–6
Acidity 3 × 10 by mass, max.
–6
Water content 10 × 10 by mass, max.
Non-volatile residue 0,01 % by mass, max.
Suspended matter or sediment None visible
Table 2 — Physical properties of HFC 23
Property Units Value
Molecular mass — 70
Boiling point at 1,013 bar (absolute) °C –82,0
Freezing point °C –155,2
Critical temperature °C 25,9
Critical pressure bar abs 48,36
3
Critical volume cm /mol 133
3
Critical density kg/m 525
Vapour pressure 20 °C bar abs 41,80
3
Liquid density 20 °C kg/m 806,6
3
Saturated vapour density 20 °C kg/m 263,0
3
Specific volume of superheated m /kg 0,340 9
vapour at 1,013 bar and 20 °C
Chemical formula CHF
3
Chemical name
Trifluoromethane
4.2 Use of HFC 23 systems
HFC 23 total flooding systems may be used for extinguishing fires of all classes within the limits
specified in ISO 14520-1:2015, Clause 4.
The extinguishant requirements per volume of protected space are shown in Table 3 for various levels
of concentration. These are based on methods shown in ISO 14520-1:2015, 7.6.
The extinguishing concentrations and design concentrations for n-heptane and surface class A hazards
are shown in Table 4. Concentrations for acetone heptane, methanol and toluene are shown in Table 5,
and inerting concentrations are shown in Table 6.
2 © ISO 2016 – All rights reserved

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ISO 14520-10:2016(E)

Table 3 — HFC 23 total flooding quantity
3
Tempera- Specific HFC 23 mass requirements per unit volume of protected space, m/V (kg/m )
ture vapour
volume
Design concentration (by volume)
T
S
°C
3
m /kg 10 % 12 % 14 % 15 % 16 % 17 % 18 % 20 % 22 % 24 %
–60 0,2428 0,4576 0,5616 0,6705 0,7268 0,7845 0,8436 0,9041 1,0297 1,1617 1,3006
–55 0,2492 0,4459 0,5472 0,6533 0,7081 0,7644 0,8219 0,8809 1,0032 1,1318 1,2672
–50 0,2555 0,4349 0,5337 0,6371 0,6907 0,7455 0,8016 0,8591 0,9785 1,1039 1,2360
–45 0,2617 0,4246 0,5211 0,6221 0,6743 0,7278 0,7826 0,8388 0,9553 1,0778 1,2067
–40 0,2680 0,4146 0,5088 0,6074 0,6585 0,7107 0,7643 0,8191 0,9328 1,0524 1,1783
–35 0,2742 0,4052 0,4973 0,5937 0,6436 0,6947 0,7470 0,8006 0,9117 1,0286 1,1517
–30 0,2803 0,3964 0,4865 0,5808 0,6296 0,6795 0,7307 0,7831 0,8919 1,0062 1,1266
–25 0,2865 0,3878 0,4760 0,5682 0,6160 0,6648 0,7149 0,7662 0,8726 0,9845 1,1022
–20 0,2926 0,3797 0,4660 0,5564 0,6031 0,6510 0,7000 0,7502 0,8544 0,9639 1,0793
–15 0,2987 0
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 14520-10
ISO/TC 21/SC 8 Secretariat: SA
Voting begins on: Voting terminates on:
2014-11-24 2015-02-24
Gaseous fire-extinguishing systems — Physical properties
and system design —
Part 10:
HFC 23 extinguishant
Systèmes d’extinction d’incendie utilisant des agents gazeux — Propriétés physiques et conception des
systèmes —
Partie 10: Agent extincteur HFC 23
ICS: 13.220.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 14520-10:2014(E)
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 SUPPORTING DOCUMENTATION. ISO 2014

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ISO/DIS 14520-10:2014(E)

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as
permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract
from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,
electronic, photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
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Violators may be prosecuted.
ii © ISO 2014 – All rights reserved

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ISO/CD 14520-10
Contents Page
Foreword . iv
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
4 Characteristics and uses . 1
4.1 General . 1
4.2 Use of HFC 23 systems . 2
5 Safety of personnel . 5
6 System design . 5
6.1 Fill density . 5
6.2 Superpressurization . 6
6.3 Extinguishant quantity . 6
7.0 Environmental properties.8

© ISO 2012 – All rights reserved iii

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ISO/CD 14520-10
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 14520-10 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 8, Gaseous media fire fighting systems using gas.
This second/third/. edition cancels and replaces the first/second/. edition (), [clause(s) / subclause(s) /
table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.
ISO 14520 consists of the following parts, under the general title Gaseous fire-extinguishing systems —
Physical properties and systems design:
 Part 1: General requirements
 Part 2: CF I extinguishant
3
 Part 3: Withdrawn
 Part 4: Withdrawn
 Part 5: FK-5-1-12 extinguishant
 Part 6: HCFC Blend A extinguishant
 Part 7: Withdrawn
 Part 8: HFC 125 extinguishant
 Part 9: HFC 227ea extinguishant
 Part 10: HFC 23 extinguishant
 Part 11: HFC 236fa extinguishant
 Part 12: IG-01 extinguishant
 Part 13: IG-100 extinguishant
 Part 14: IG-55 extinguishant
 Part 15: IG-541 extinguishant
iv © ISO 2012 – All rights reserved

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COMMITTEE DRAFT ISO/CD 14520-10

Gaseous fire-extinguishing systems — Physical properties and
systems design — Part 10: HFC 23 extinguishant
1 Scope
This part of ISO 14520 contains specific requirements for gaseous fire-extinguishing systems, with respect to
the HFC 23 extinguishant. It includes details of physical properties, specification, usage and safety aspects
and is applicable to systems operating at a nominal pressure of 41 bar without nitrogen superpressurization
and 70 bar superpressurized with nitrogen.
2 Normative reference
The following referenced documents are indispensable for the application 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 14520-1, Gaseous fire-extinguishing systems — Physical properties and system design —
Part 1: General requirements.
3 Terms and definitions
For the purposes of this part of ISO 14520, the terms and definitions given in ISO 14520-1 apply.
4 Characteristics and uses
4.1 General
Extinguishant HFC 23 shall comply with the specification shown in Table 1.
HFC 23 is a colourless, almost odourless, electrically non-conductive gas with a density approximately 2,4
times that of air.
The physical properties are shown in Table 2.
HFC 23 extinguishes fires mainly by physical means, but by some chemical means.
© ISO 2012 – All rights reserved 1

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ISO/CD 14520-10
Table 1 — Specification for HFC 23
Property Requirement
Purity 99,6 % (mol/mol), min.
–6
Acidity
3 × 10  by mass, max.
–6
Water content
10 × 10 by mass, max.
Non-volatile residue 0,01 % by mass, max.
Suspended matter or sediment None visible

Table 2 — Physical properties of HFC 23
Property Units Value
Molecular mass — 70
Boiling point at 1,013 bar (absolute) –82,0
°C
Freezing point –155,2
°C
Critical temperature 25,9
°C
Critical pressure bar abs 48,36
3
Critical volume cm /mol 133
3
Critical density kg/m 525
Vapour pressure 20 °C bar abs 41,80
3
Liquid density 20 °C kg/m 806,6
3
Saturated vapour density 20 °C kg/m 263,0
3
Specific volume of superheated m /kg 0,3409
vapour at 1,013 bar and 20 °C
Chemical formula CHF
3
Trifluoromethane
Chemical name

4.2 Use of HFC 23 systems
HFC 23 total flooding systems may be used for extinguishing fires of all classes within the limits specified in
clause 4 of ISO 14520-1.
The extinguishant requirements per volume of protected space are shown in Table 3 for various levels of
concentration. These are based on methods shown in 7.6 of ISO 14520-1.
The extinguishing concentrations and design concentrations for n-heptane and surface class A hazards are
shown in Table 4. Concentrations for acetone heptane, methanol and toluene are shown in Table 5, and
inerting concentrations are shown in Table 6.
2 © ISO 2012 – All rights reserved

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ISO/CD 14520-10
Table 3 — HFC 23 total flooding quantity
3
Temperature Specific
HCFC 23 mass requirements per unit volume of protected space, m/V (kg/m )
vapour

volume
Design concentration (by volume)
T S
°C
3
m /kg 10 % 12 % 14 % 15 % 16 % 17 % 18 % 20 % 22 % 24 %
0,2
...