ISO 14520-9:2019
(Main)Gaseous fire-extinguishing systems — Physical properties and system design — Part 9: HFC 227ea extinguishant
Gaseous fire-extinguishing systems — Physical properties and system design — Part 9: HFC 227ea extinguishant
This document contains specific requirements for gaseous fire-extinguishing systems, with respect to the HFC 227ea extinguishant. It includes details of physical properties, specifications, usage and safety aspects. This document is applicable to systems operating at nominal pressures of 25 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 9: Agent extincteur HFC 227ea
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INTERNATIONAL ISO
STANDARD 14520-9
Fourth edition
2019-07
Gaseous fire-extinguishing systems —
Physical properties and system
design —
Part 9:
HFC 227ea extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 9: Agent extincteur HFC 227ea
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
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Published in Switzerland
ii © ISO 2019 – All rights reserved
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 227ea 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 . 9
7 Environmental properties . 9
Bibliography .11
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 14520-9:2016), 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
INTERNATIONAL STANDARD ISO 14520-9:2019(E)
Gaseous fire-extinguishing systems — Physical properties
and system design —
Part 9:
HFC 227ea extinguishant
1 Scope
This document contains specific requirements for gaseous fire-extinguishing systems, with respect to
the HFC 227ea extinguishant. It includes details of physical properties, specifications, usage and safety
aspects.
This document is applicable to systems operating at nominal pressures of 25 bar, 42 bar 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 14520-1:2015, 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 227ea shall comply with the specification shown in Table 1.
HFC 227ea is a colourless, almost odourless, electrically non-conductive gas, with a density
approximately six times that of air.
The physical properties are shown in Table 2.
HFC 227ea extinguishes fires mainly by physical means, but also by some chemical means.
Table 1 — Specification for HFC 227ea
Property Requirement
Purity 99,6 % by mass, min.
Table 1 (continued)
Property Requirement
–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 227ea
Property Units Value
Molecular mass — 170
Boiling point at 1,013 bar (absolute) °C −16,4
Freezing point °C −127
Critical temperature °C 101,7
Critical pressure bar abs 29,26
Critical volume cm /mol 274
Critical density kg/m 573
Vapour pressure 20 °C bar abs 3,90
Liquid density 20 °C kg/m 1 410
Saturated vapour density 20 °C kg/m 31,035
Specific volume of superheated m /kg 0,137 4
vapour at 1,013 bar and 20 °C
Chemical formula CF CHFCF
3 3
Chemical name
Heptafluoropropane
4.2 Use of HFC 227ea systems
HFC 227ea 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 other fuels are shown in Table 5 and inerting concentrations
are shown in Table 6.
Table 3 — HFC 227ea total flooding quantity
Temperature Specific HCF 227ea mass requirements per unit volume of protected space, m/V (kg/m )
vapour
T
volume
Design concentration (by volume)
°C
S
m /kg 6 % 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 %
–10 0,121 5 0,525 4 0,619 6 0,715 8 0,814 2 0,914 7 1,017 4 1,122 5 1,230 1 1,340 1 1,452 7
–5 0,124 1 0,514 2 0,606 4 0,700 5 0,796 7 0,895 1 0,995 7 1,098 5 1,203 8 1,311 4 1,421 6
0 0,126 8 0,503 4 0,593 6 0,685 8 0,780 0 0,876 3 0,974 8 1,075 5 1,178 5 1,283 9 1,391 8
5 0,129 4 0,493 2 0,581 6 0,671 9 0,764 2 0,858 6 0,955 0 1,053 7 1,154 6 1,257 9 1,363 6
10 0,132 0 0,483 4 0,570 0 0,658 5 0,749 0 0,841 4 0,936 0 1,032 7 1,131 6 1,232 8 1,336 4
15 0,134 7 0,474 0 0,558 9 0,645 7 0,734 4 0,825 1 0,917 8 1,012 6 1,109 6 1,208 9 1,310 5
20 0,137 3 0,465 0 0,548 3 0,633 5 0,720 5 0,809 4 0,900 4 0,993 4 1,088 6 1,185 9 1,285 6
2 © ISO 2019 – All rights reserved
Table 3 (continued)
Temperature Specific HCF 227ea mass requirements per unit volume of protected space, m/V (kg/m )
vapour
T
volume
Design concentration (by volume)
°C
S
m /kg 6 % 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 %
25 0,139 9 0,456 4 0,538 2 0,621 7 0,707 1 0,794 4 0,883 7 0,975 0 1,068 4 1,164 0 1,261 8
30 0,142 5 0,448 1 0,528 4 0,610 4 0,694 3 0,780 0 0,867 6 0,957 3 1,049 0 1,142 8 1,238 8
35 0,145 0 0,440 1 0,519 0 0,599 6 0,681 9 0,766 1 0,852 2 0,940 2 1,030 3 1,122 4 1,216 8
40 0,147 6 0,432 4 0,509 9 0,589 1 0,670 1 0,752 8 0,837 4 0,923 9 1,012 4 1,102 9 1,195 6
45 0,150 2 0,425 0 0,501 2 0,579 0 0,658 6 0,739 9 0,823 0 0,908 0 0,995 0 1,084 0 1,175 1
50 0,152 7 0,418 0 0,492 9 0,569 4 0,647 6 0,727 6 0,809 3 0,892 9 0,978 4 1,066 0 1,155 5
55 0,155 3 0,411 1 0,484 7 0,560 0 0,636 9 0,715 6 0,796 0 0,878 2 0,962 3 1,048 4 1,136 5
60 0,157 8 0,404 5 0,477 0 0,551 0 0,626 7 0,704 1 0,783 2 0,864 1 0,946 9 1,031 6 1,118 3
65 0,160 4 0,398 0 0,469 4 0,542 3 0,616 7 0,692 9 0,770 7 0,850 4 0,931 8 1,015 2 1,100 5
70 0,162 9 0,391 9 0,462 1 0,533 8 0,607 2 0,682 1 0,758 8 0,837 1 0,917 3 0,999 4 1,083 4
75 0,165 4 0,385 9 0,455 0 0,525 7 0,597 9 0,671 7 0,747 1 0,824 3 0,903 3 0,984 1 1,066 8
80 0,167 9 0,380 1 0,448 2 0,517 8 0,589 0 0,661 7 0,736 0 0,812 0 0,889 8 0,969 4 1,050 9
85 0,170 4 0,374 5 0,441 6 0,510 2 0,580 3 0,651 9 0,725 1 0,800 0 0,876 7 0,955 1 1,035 4
90 0,173 0 0,369 0 0,435 1 0,502 7 0,571 7 0,642 3 0,714 5 0,788 3 0,863 8 0,941 1 1,020 2
95 0,175 5 0,363 8 0,429 0 0,495 6 0,563 6 0,633 2 0,704 4 0,777 1 0,851 6 0,927 7 1,005 7
100 0,178 0 0,358 7 0,422 9 0,488 6 0,555 7 0,624 3 0,694 5 0,766 2 0,839 6 0,914 7 0,991 6
NOTE This information refers only to the product HFC-227ea and does not represent any other products containing
1,1,1,2,3,3,3-heptafluoropropane as a component.
Symbols:
m/V is the agent mass requirements (kg/m ), i.e. mass, m, in kilograms of agent required per cubic metre of protected volume,
V, to produce the indicated concentration at the temperature specified;
V is the net volume of hazard (m ), i.e. the enclosed volume minus the fixed structures impervious to extinguishant
c V
m=
100−c S
T is the temperature (°C), i.e. the design temperature in the hazard area;
S is the specific volume (m /kg), the specific volume of superheated HFC 227ea vapour at a pressure of 1,013 bar may be
approximated by the formula
S = k + k T
1 2
where
k = 0,126 9;
k = 0,000 513.
c is the concentration (%), i.e. the volumetric concentration of HFC 227ea in air at the temperature indicated and a pressure
of 1,013 bar absolute.
Table 4 — HFC 227ea reference extinguishing and design concentrations
Fuel Extinguishment Minimum design
% by volume % by volume
Class B
Heptane (cup burner) 6,7 9,0
Heptane (room test) 6,9
Surface Class A
Wood Crib 4,9 7,9
PMMA 6,1
PP 6,1
ABS 6,1
Higher Hazard Class A See NOTE 4 8,5
NOTE 1 The extinguishment values for the Class B and the Surface Class A fuels are
determined by testing in accordance with ISO 14520-1:2015, Annexes B and C.
NOTE 2 The minimum design concentration for the Class B fuel is the higher value of the
heptane cup burner or room test heptane extinguishment concentration multiplied by 1,3.
NOTE 3 The minimum design concentration for Surface Class A fuel is the highest value
of the wood crib, PMMA, PP or ABS extinguishment concentrations multiplied by 1,3. In
...
ISO TC 21/SC 8
Date: 2019.10.0107
ISO /PRF 14520-9:2019(E)
Secretariat: SA
Gaseous fire-extinguishing systems — Physical properties and system design —
Part 9: HFC 227ea extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux -- Propriétés physiques
et conception des systèmes -- Partie 9: Agent extincteur HFC 227ea
Document type: International Standard
Document subtype:
Document stage: (30) Committee
Document language: E
O:\Documents\TC021\SC008\055345 - ISO_NP 14520-9 (Ed
3)\60.00\320\C055345e_converted.doc STD Version 2.1c
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 14520-9:2016), 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.
ii
INTERNATIONAL STANDARD ISO 14520-9:2019(E)
Gaseous fire-extinguishing systems — Physical properties and
system design — Part 9: HFC 227ea extinguishant
1 Scope
This document contains specific requirements for gaseous fire-extinguishing systems, with respect to
the HFC 227ea extinguishant. It includes details of physical properties, specifications, usage and safety
aspects.
This document is applicable to systems operating at nominal pressures of 25 bar, 42 bar 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 14520-1:2015, 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 227ea shall comply with the specification shown in Table 1.
HFC 227ea is a colourless, almost odourless, electrically non-conductive gas, with a density
approximately six times that of air.
The physical properties are shown in Table 2.
HFC 227ea extinguishes fires mainly by physical means, but also by some chemical means.
Table 1 — Specification for HFC 227ea
Property Requirement
Purity 99,6 % by mass, 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 227ea
Property Units Value
Molecular mass — 170
Boiling point at 1,013 bar (absolute) °C −16,4
Freezing point °C −127
Critical temperature °C 101,7
Critical pressure bar abs 29,26
Critical volume cm /mol 274
Critical density kg/m 573
Vapour pressure 20 °C bar abs 3,90
Liquid density 20 °C kg/m 1 410
Saturated vapour density 20 °C kg/m 31,035
Specific volume of superheated m /kg 0,137 4
vapour at 1,013 bar and 20 °C
Chemical formula CF3CHFCF3
Heptafluoropropane
Chemical name
4.2 Use of HFC 227ea systems
HFC 227ea 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 other fuels are shown in Table 5 and inerting concentrations
are shown in Table 6.
Table 3 — HFC 227ea total flooding quantity
Temperature Specific HCF 227ea mass requirements per unit volume of protected space, m/V (kg/m )
vapour
T
volume
Design concentration (by volume)
°C
S
m /kg 6 % 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 %
–10 0,121 5 0,525 4 0,619 6 0,715 8 0,814 2 0,914 7 1,017 4 1,122 5 1,230 1 1,340 1 1,452 7
–5 0,124 1 0,514 2 0,606 4 0,700 5 0,796 7 0,895 1 0,995 7 1,098 5 1,203 8 1,311 4 1,421 6
0 0,126 8 0,503 4 0,593 6 0,685 8 0,780 0 0,876 3 0,974 8 1,075 5 1,178 5 1,283 9 1,391 8
2 © ISO 2019 – All rights reserved
ISO/PRF 14520-9:2019(E)
5 0,129 4 0,493 2 0,581 6 0,671 9 0,764 2 0,858 6 0,955 0 1,053 7 1,154 6 1,257 9 1,363 6
10 0,132 0 0,483 4 0,570 0 0,658 5 0,749 0 0,841 4 0,936 0 1,032 7 1,131 6 1,232 8 1,336 4
15 0,134 7 0,474 0 0,558 9 0,645 7 0,734 4 0,825 1 0,917 8 1,012 6 1,109 6 1,208 9 1,310 5
20 0,137 3 0,465 0 0,548 3 0,633 5 0,720 5 0,809 4 0,900 4 0,993 4 1,088 6 1,185 9 1,285 6
25 0,139 9 0,456 4 0,538 2 0,621 7 0,707 1 0,794 4 0,883 7 0,975 0 1,068 4 1,164 0 1,261 8
30 0,142 5 0,448 1 0,528 4 0,610 4 0,694 3 0,780 0 0,867 6 0,957 3 1,049 0 1,142 8 1,238 8
35 0,145 0 0,440 1 0,519 0 0,599 6 0,681 9 0,766 1 0,852 2 0,940 2 1,030 3 1,122 4 1,216 8
40 0,147 6 0,432 4 0,509 9 0,589 1 0,670 1 0,752 8 0,837 4 0,923 9 1,012 4 1,102 9 1,195 6
45 0,150 2 0,425 0 0,501 2 0,579 0 0,658 6 0,739 9 0,823 0 0,908 0 0,995 0 1,084 0 1,175 1
50 0,152 7 0,418 0 0,492 9 0,569 4 0,647 6 0,727 6 0,809 3 0,892 9 0,978 4 1,066 0 1,155 5
55 0,155 3 0,411 1 0,484 7 0,560 0 0,636 9 0,715 6 0,796 0 0,878 2 0,962 3 1,048 4 1,136 5
60 0,157 8 0,404 5 0,477 0 0,551 0 0,626 7 0,704 1 0,783 2 0,864 1 0,946 9 1,031 6 1,118 3
65 0,160 4 0,398 0 0,469 4 0,542 3 0,616 7 0,692 9 0,770 7 0,850 4 0,931 8 1,015 2 1,100 5
70 0,162 9 0,391 9 0,462 1 0,533 8 0,607 2 0,682 1 0,758 8 0,837 1 0,917 3 0,999 4 1,083 4
75 0,165 4 0,385 9 0,455 0 0,525 7 0,597 9 0,671 7 0,747 1 0,824 3 0,903 3 0,984 1 1,066 8
80 0,167 9 0,380 1 0,448 2 0,517 8 0,589 0 0,661 7 0,736 0 0,812 0 0,889 8 0,969 4 1,050 9
85 0,170 4 0,374 5 0,441 6 0,510 2 0,580 3 0,651 9 0,725 1 0,800 0 0,876 7 0,955 1 1,035 4
90 0,173 0 0,369 0 0,435 1 0,502 7 0,571 7 0,642 3 0,714 5 0,788 3 0,863 8 0,941 1 1,020 2
95 0,175 5 0,363 8 0,429 0 0,495 6 0,563 6 0,633 2 0,704 4 0,777 1 0,851 6 0,927 7 1,005 7
100 0,178 0 0,358 7 0,422 9 0,488 6 0,555 7 0,624 3 0,694 5 0,766 2 0,839 6 0,914 7 0,991 6
NOTE This information refers only to the product HFC-227ea and does not represent any other products containing 1,1,1,2,3,3,3-
heptafluoropropane as a component.
Symbols:
m/V is the agent mass requirements (kg/m ), i.e. mass, m, in kilograms of agent required per cubic metre of protected volume, V, to
produce the indicated concentration at the temperature specified;
V is the net volume of hazard (m ), i.e. the enclosed volume minus the fixed structures impervious to extinguishant
cV
m=
100−cS
T is the temperature (°C), i.e. the design temperature in the hazard area;
S is the specific volume (m /kg), the specific volume of superheated HFC 227ea vapour at a pressure of 1,013 bar may be
approximated by the formula
S = k1 + k2T
where
k1 = 0,126 9;
k2 = 0,000 513.
c is the concentration (%), i.e. the volumetric concentration of HFC 227ea in air at the temperature indicated and a pressure of
1,013 bar absolute.
Table 4 — HFC 227ea reference extinguishing and design concentrations
Fuel Extinguishment Minimum design
% by volume % by volume
Class B
©
...
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