ISO/PRF 14520-5

Gaseous fire-extinguishing systems — Physical properties and system design — Part 5: FK-5-1-12 extinguishant

This document contains specific requirements for gaseous fire-extinguishing systems, with respect to FK-5-1-12 extinguishant. It includes details of physical properties, specifications, usage and safety aspects. This document is applicable only to systems operating at nominal pressures of 25 bar, 34,5 bar, 42 bar and 50 bar with nitrogen propellant. This does not preclude the use of other systems.

Systèmes d'extinction d'incendie utilisant des agents gazeux — Propriétés physiques et conception des systèmes — Partie 5: Agent extincteur FK-5-1-12

General Information

• Status: Not Published
• 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 - Gaseous media and firefighting systems using gas
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Completion Date: 08-Sep-2023

Relations

• Revises: ISO 14520-5:2019 - Gaseous fire-extinguishing systems — Physical properties and system design — Part 5: FK-5-1-12 extinguishant
• Effective Date: 06-Jun-2022

Standards Content (Sample)

DRAFT INTERNATIONAL STANDARD
ISO/DISPRF 14520-5:2022(E)
ISO /TC 21/SC 8
Date: 2022-12-08
Secretariat: SA
Date: 2023-09-08
Gaseous fire -extinguishing systems — Physical properties and
system design —
Part 5:
FK-5-1-12 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux -- — Propriétés physiques et conception des
systèmes -- —
Partie 5: Agent extincteur FK-5-1-12
FDIS stage

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ISO/DISPRF 14520-5:20222023(E)
© ISO 2023
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: [phone]
Email: [e-mail]
E-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2022 – All rights reserved
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/DISPRF 14520-5:20222023(E)
Contents Page
Foreword . iv
Part 5: FK-5-1-12 extinguishant . 1
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 FK-5-1-12 systems . 2
5 Safety of personnel . 5
6 System design . 6
6.1 Fill density . 6
6.2 Superpressurization . 7
6.3 Extinguishant quantity . 7
6.4 Other fill density and superpressurization levels . 11
7 Environmental properties . 11
Bibliography . 13

Foreword iv

© ISO 2022 – All rights reserved iii
© ISO 2023 – All rights reserved iii

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ISO/DISPRF 14520-5:20222023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of
(a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO [had/had not] received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for
identifying any or all such patent rights.
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 14520-25:2019), which has been
technically revised.
The main changes are as follows:
— — new specifications for dimers have been added to Table 1.Table 1.
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 2022 – All rights reserved
iv © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 14520-5:2022(E)

Gaseous fire -extinguishing systems — Physical properties and
system design —
Part 5:
FK-5-1-12 extinguishant
1 Scope
This document contains specific requirements for gaseous fire-extinguishing systems, with respect to FK-
5-1-12 extinguishant. It includes details of physical properties, specifications, usage and safety aspects.
This document is applicable only to systems operating at nominal pressures of 25 bar, 34,5 bar, 42 bar
1
and 50 bar with nitrogen propellant. This does not preclude the use of other systems.
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, 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 terminologicalterminology databases for use in standardization at the following
addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— — ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Characteristics and uses
4.1 General
Extinguishant FK-5-1-12 shall conform to the specifications shown in Table 1.Table 1.
FK-5-1-12 is a clear, colourless, almost odourless, electrically non-conductive gas with a density
approximately 11 times that of air.
The physical properties are shown in Table 2.Table 2.
FK-5-1-12 extinguishes fires mainly by physical means, but also by some chemical means.
Table 1 — Specifications for FK-5-1-12

1 5 2
 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
© ISO 2022 – All rights reserved 1

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ISO/DISPRF 14520-5:20222023(E)
Property Requirement
Purity 99,0 % mol/mol min.
–6
Acidity 3 × 10 by mass, max.
Water content 0,001 % by mass, max.
Non-volatile residue 0,03 % by mass, max.
Suspended matter or sediment None visible
a
Kinetic dimers of HFP <2 850 mg/kg
Thermodynamic dimer of HFP + HF
<95 mg/kg
b
adduct
a
 Kinetic dimers of HFP (CAS Registry Number® 2070-70-4). (Chemical Abstracts Service
(CAS) Registry Number® is a trademark of the American Chemical Society (ACS). This
information is given for the convenience of users of this document and does not constitute
an endorsement by ISO of the product named. Equivalent products may be used if they can
be shown to lead to the same results).
b
 Thermodynamic dimer of HFP (CAS 1584-03-8) and its adduct (CAS 30320-28-6).
Table 2 —— Physical properties of FK-5-1-12
Property Units Value
Molecular mass n/a 316,04
Boiling point at 1 013 bar
°C 49,2
(absolute)
Freezing point °C –108,0
Critical temperature °C 168,66
Critical pressure bar 18,646
Critical volume cc/mole 494,5
3
Critical density kg/m 639,1
Vapour pressure 20 °C bar abs 0,326 0
Liquid density 20 °C g/ml 1,616
3
Saturated vapour density 20 °C kg/m 4,330 5
Specific volume of superheated
3
m /kg 0,071 9
vapour at 1 013 bar and 20 °C
Heat of vapourization at boiling
KJ/kg 88,0
point
Chemical formula
CF3CF2C(O)CF(CF3)2
Dodecafluoro-2-methylpentan-3-one
Chemical name
5 2
NOTE   1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
4.2 Use of FK-5-1-12 systems
FK-5-1-12 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 3Table 3 for various
levels of concentration. These are based on methods shown in ISO 14520--1:2015, 7.6.
2 © ISO 2022 – All rights reserved
2 © ISO 2023 – All rights reserved

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ISO/DISPRF 14520-5:20222023(E)
The extinguishing concentrations and design concentrations for heptane and Surface Class A hazards are
shown in Table 4.Table 4. Concentrations for other fuels are shown in Table 5Table 5 and inerting
concentrations in Table 6.Table 6.
Table 3 —— FK-5-1-12 total flooding quantity
Temperature Specific
3
FK-5-1-12 mass requirements per unit volume of protected space, m/V (kg/m )
volume
T S Design concentration (by volume)
3
°C m /kg 3 % 4 % 5 % 6 % 7 % 8 % 9 % 10 %
–20 0,060 9 0,507 7 0,684 0 0,864 0 1,040 7 1,235 7 1,427 5 1,623 6 1,824 1
–15 0,062 3 0,496 5 0,669 0 0,845 0 1,024 8 1,208 4 1,396 1 1,587 9 1,783 9
–10 0,063 7 0,485 9 0,654 5 0,826 8 1,002 7 1,182 4 1,366 0 1,553 7 1,745 5
–5 0,065 0 0,475 6 0,640 7 0,809 4 0,981 6 1,157 5 1,337 2 1,520 9 1,708 7
0 0,066 4 0,465 8 0,627 5 0,792 6 0,961 3 1,133 6 1,309 6 1,489 5 1,673 4
5 0,067 8 0,456 4 0,614 8 0,776 6 0,941 8 1,110 6 1,283 1 1,459 3 1,639 5
10 0,069 1 0,447 3 0,602 6 0,761 2 0,923 2 1,088 6 1,257 6 1,430 4 1,607 0
15 0,070 5 0,438 6 0,590 9 0,746 4 0,905 2 1,067 4 1,233 2 1,402 6 1,575 7
20 0,071 9 0,430 2 0,579 6 0,732 2 0,887 9 1,047 1 1,209 6 1,375 8 1,545 7
25 0,073 3 0,422 2 0,568 8 0,718 4 0,871 3 1,027 5 1,187 0 1,350 0 1,516 7
30 0,074 6 0,414 4 0,558 3 0,705 2 0,855 3 1,008 6 1,165 2 1,325 2 1,488 8
35 0,076 0 0,406 9 0,548 2 0,692 5 0,839 9 0,990 4 1,144 2 1,301 3 1,462 0
40 0,077 4 0,399 7 0,538 5 0,680 2 0,825 0 0,972 8 1,123 9 1,278 3 1,436 1
45 0,078 7 0,392 8 0,529 1 0,668 4
...

INTERNATIONAL ISO
STANDARD 14520-5
Fourth edition
Gaseous fire-extinguishing systems —
Physical properties and system
design —
Part 5:
FK-5-1-12 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 5: Agent extincteur FK-5-1-12
PROOF/ÉPREUVE
Reference number
ISO 14520-5:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 14520-5:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 14520-5:2023(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 FK-5-1-12 systems . 2
5 Safety of personnel .5
6 System design . 6
6.1 Fill density . 6
6.2 Superpressurization . 7
6.3 Extinguishant quantity . 7
6.4 Other fill density and superpressurization levels . 10
7 Environmental properties . .10
Bibliography .12
iii
© ISO 2023 – All rights reserved PROOF/ÉPREUVE

---------------------- Page: 3 ----------------------
ISO 14520-5:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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 14520-5:2019), which has been
technically revised.
The main changes are as follows:
— new specifications for dimers have been added to Table 1.
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
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 14520-5:2023(E)
Gaseous fire-extinguishing systems — Physical properties
and system design —
Part 5:
FK-5-1-12 extinguishant
1 Scope
This document contains specific requirements for gaseous fire-extinguishing systems, with respect
to FK-5-1-12 extinguishant. It includes details of physical properties, specifications, usage and safety
aspects.
This document is applicable only to systems operating at nominal pressures of 25 bar, 34,5 bar, 42 bar
1)
and 50 bar with nitrogen propellant. This does not preclude the use of other systems.
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, 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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Characteristics and uses
4.1 General
Extinguishant FK-5-1-12 shall conform to the specifications shown in Table 1.
FK-5-1-12 is a clear, colourless, almost odourless, electrically non-conductive gas with a density
approximately 11 times that of air.
The physical properties are shown in Table 2.
FK-5-1-12 extinguishes fires mainly by physical means, but also by some chemical means.
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
1
© ISO 2023 – All rights reserved PROOF/ÉPREUVE

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ISO 14520-5:2023(E)
Table 1 — Specifications for FK-5-1-12
Property Requirement
Purity 99,0 % mol/mol min.
–6
Acidity 3 × 10 by mass, max.
Water content 0,001 % by mass, max.
Non-volatile residue 0,03 % by mass, max.
Suspended matter or sediment None visible
a
Kinetic dimers of HFP <2 850 mg/kg
Thermodynamic dimer of HFP + HF
<95 mg/kg
b
adduct
a
Kinetic dimers of HFP (CAS Registry Number® 2070-70-4). (Chemical Abstracts
Service (CAS) Registry Number® is a trademark of the American Chemical Society
(ACS). This information is given for the convenience of users of this document and does
not constitute an endorsement by ISO of the product named. Equivalent products may be
used if they can be shown to lead to the same results).
b
Thermodynamic dimer of HFP (CAS 1584-03-8) and its adduct (CAS 30320-28-6).
Table 2 — Physical properties of FK-5-1-12
Property Units Value
Molecular mass n/a 316,04
Boiling point at 1 013 bar (absolute) °C 49,2
Freezing point °C –108,0
Critical temperature °C 168,66
Critical pressure bar 18,646
Critical volume cc/mole 494,5
3
Critical density kg/m 639,1
Vapour pressure 20 °C bar abs 0,326 0
Liquid density 20 °C g/ml 1,616
3
Saturated vapour density 20 °C kg/m 4,330 5
Specific volume of superheated
3
m /kg 0,071 9
vapour at 1 013 bar and 20 °C
Heat of vapourization at boiling
KJ/kg 88,0
point
Chemical formula CF CF C(O)CF(CF )
3 2 3 2
Chemical name
Dodecafluoro-2-methylpentan-3-one
5 2
NOTE 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
4.2 Use of FK-5-1-12 systems
FK-5-1-12 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 heptane and Surface Class A hazards
are shown in Table 4. Concentrations for other fuels are shown in Table 5 and inerting concentrations
in Table 6.
2
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

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ISO 14520-5:2023(E)
Table 3 — FK-5-1-12 total flooding quantity
Temperature Specific FK-5-1-12 mass requirements per unit volume of protected space, m/V (kg/
3
volume m )
T S Design concentration (by volume)
3
°C m /kg 3 % 4 % 5 % 6 % 7 % 8 % 9 % 10 %
–20 0,060 9 0,507 7 0,684 0 0,864 0 1,040 7 1,235 7 1,427 5 1,623 6 1,824 1
–15 0,062 3 0,496 5 0,669 0 0,845 0 1,024 8 1,208 4 1,396 1 1,587 9 1,783 9
–10 0,063 7 0,485 9 0,654 5 0,826 8 1,002 7 1,182 4 1,366 0 1,553 7 1,745 5
–5 0,065 0 0,475 6 0,640 7 0,809 4 0,981 6 1,157 5 1,337 2 1,520 9 1,708 7
0 0,066 4 0,465 8 0,627 5 0,792 6 0,961 3 1,133 6 1,309 6 1,489 5 1,673 4
5 0,067 8 0,456 4 0,614 8 0,776 6 0,941 8 1,110 6 1,283 1 1,459 3 1,639 5
10 0,069 1 0,447 3 0,602 6 0,761 2 0,923 2 1,088 6 1,257 6 1,430 4 1,607 0
15 0,070 5 0,438 6 0,590 9 0,746 4 0,905 2 1,067 4 1,233 2 1,402 6 1,575 7
20 0,071 9 0,430 2 0,579 6 0,732 2 0,887 9 1,047 1 1,209 6 1,375 8 1,545 7
25 0,073 3 0,422 2 0,568 8 0,718 4 0,871 3 1,027 5 1,187 0 1,350 0 1,516 7
30 0,074 6 0,414 4 0,558 3 0,705 2 0,855 3 1,008 6 1,165 2 1,325 2 1,488 8
35 0,076 0 0,406 9 0,548 2 0,692 5 0,839 9 0,990 4 1,144 2 1,301 3 1,462 0
40 0,077 4 0,399 7 0,538 5 0,680 2 0,825 0 0,972 8 1,123 9 1,278 3 1,436 1
45 0,078 7 0,392 8 0,529 1 0,668 4 0,810 6 0,955 9 1,104 3 1,256 0 1,411 1
50 0,080 1 0,386 0 0,520 1 0,657 0 0,796 7 0,939 5 1,085 4 1,234 5 1,386 9
55 0,081 5 0,379 5 0,511 3 0,645 9 0,783 3 0,923 7 1,067 1 1,213 7 1,363 6
60 0,082 9 0,373 3 0,502 9 0,635 2 0,770 4 0,908 4 1,049 5 1,193 6 1,341 0
65 0,084 2 0,367 2 0,494 7 0,624 7 0,757 8 0,893 6 1,032 4 1,174 2 1,319 1
70 0,085 6 0,361 3 0,486 8 0,614 8 0,745 7 0,879 3 1,015 8 1,155 4 1,298 0
75 0,087 0 0,355 6 0,479 1 0,605 2 0,733 9 0,865 4 0,999 8 1,137 2 1,277 5
80 0,088 3 0,350 1 0,471 6 0,595 8 0,722 5 0,852 0 0,984 3 1,119 5 1,257 7
85 0,089 7 0,344 7 0,464 4 0,586 6 0,711 5 0,839 0 0,969 2 1,102 4 1,238
...