Gaseous fire-extinguishing systems -- Physical properties and system design

This document contains specific requirements for gaseous fire-extinguishing systems, with respect to the HFC 23 extinguishant. It includes details of physical properties, specifications, usage and safety aspects. It 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

General Information

Status
Published
Publication Date
01-Jul-2019
Current Stage
6060 - International Standard published
Start Date
24-May-2019
Completion Date
02-Jul-2019
Ref Project

RELATIONS

Buy Standard

Standard
ISO 14520-10:2019 - Gaseous fire-extinguishing systems -- Physical properties and system design
English language
10 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 14520-10
Fourth edition
2019-07
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 14520-10:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 14520-10:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 14520-10:2019(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 ............................................................................................................................................................................................. 5

6 System design .......................................................................................................................................................................................................... 5

6.1 Fill density................................................................................................................................................................................................... 5

6.2 Superpressurization ........................................................................................................................................................................... 6

6.3 Extinguishant quantity ..................................................................................................................................................................... 6

6.4 Other fill density and superpressurization levels ..................................................................................................... 8

7 Environmental properties .......................................................................................................................................................................... 8

Bibliography .............................................................................................................................................................................................................................10

© ISO 2019 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 14520-10:2019(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 ISO/TC 21, Equipment for fire protection and fire

fighting, Subcommittee SC 8, Gaseous media and firefighting systems using gas.

This fourth edition cancels and replaces the third edition (ISO 14520-10:2016), which has been

technically revised. The main changes compared to the previous edition are as follows

— a new subclause 6.4 on fill density and superpressurization levels has been added.

A list of all parts in the ISO 14520 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 2019 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 14520-10:2019(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, specifications, usage and

safety aspects. It 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.
Table 1 — Specification for HFC 23
Property Requirement
Purity 99,6 % (mol/mol), min.
Acidity 3 × 10 by mass, max.
© ISO 2019 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 14520-10:2019(E)
Table 1 (continued)
Property Requirement
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
Critical volume cm /mol 133
Critical density kg/m 525
Vapour pressure 20 °C bar abs 41,80
Liquid density 20 °C kg/m 806,6
Saturated vapour density 20 °C kg/m 263,0
Specific volume of superheated m /kg 0,340 9
vapour at 1,013 bar and 20 °C
Chemical formula CHF
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.
Table 3 — HFC 23 total flooding quantity

Temperature Specific HFC 23 mass requirements per unit volume of protected space, m/V (kg/m )

vapour
volume
Design concentration (by volume)
m /kg 10 % 12 % 14 % 15 % 16 % 17 % 18 % 20 % 22 % 24 %

–60 0,242 8 0,457 6 0,561 6 0,670 5 0,726 8 0,784 5 0,843 6 0,904 1 1,029 7 1,161 7 1,300 6

–55 0,249 2 0,445 9 0,547 2 0,653 3 0,708 1 0,764 4 0,821 9 0,880 9 1,003 2 1,131 8 1,267 2

–50 0,255 5 0,434 9 0,533 7 0,637 1 0,690 7 0,745 5 0,801 6 0,859 1 0,978 5 1,103 9 1,236 0

–45 0,261 7 0,424 6 0,521 1 0,622 1 0,674 3 0,727 8 0,782 6 0,838 8 0,955 3 1,077 8 1,206 7

–40 0,268 0 0,414 6 0,508 8 0,607 4 0,658 5 0,710 7 0,764 3 0,819 1 0,932 8 1,052 4 1,178 3

–35 0,274 2 0,405 2 0,497 3 0,593 7 0,643 6 0,694 7 0,747 0 0,800 6 0,911 7 1,028 6 1,151 7

–30 0,280 3 0,396 4 0,486 5 0,580 8 0,629 6 0,679 5 0,730 7 0,783 1 0,891 9 1,006 2 1,126 6

–25 0,286 5 0,387 8 0,476 0 0,568 2 0,616 0 0,664 8 0,714 9 0,766 2 0,872 6 0,984 5 1,102 2

2 © ISO 2019 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 14520-10:2019(E)
Table 3 (continued)

Temperature Specific HFC 23 mass requirements per unit volume of protected space, m/V (kg/m )

vapour
volume
Design concentration (by volume)
m /kg 10 % 12 % 14 % 15 % 16 % 17 % 18 % 20 % 22 % 24 %

–20 0,292 6 0,379 7 0,466 0 0,556 4 0,603 1 0,651 0 0,700 0 0,750 2 0,854 4 0,963 9 1,079 3

–15 0,298 7 0,372 0 0,456 5 0,545 0 0,590 8 0,637 7 0,685 7 0,734 9 0,837 0 0,944 3 1,057 2

–10 0,304 7 0,364 7 0,447 5 0,534 3 0,579 2 0,625 1 0,672 2 0,720 4 0,820 5 0,925 7 1,036 4

–5 0,310 8 0,357 5 0,438 8 0,523 8 0,567 8 0,612 9 0,659 0 0,706 3 0,804 4 0,907 5 1,016 1

0 0,316 8 0,350 7 0,430 4 0,513 9 0,557 0 0,601 3 0,646 5 0,692 9
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.