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INTERNATIONAL ISO
STANDARD 14520-9
Second edition
2006-02-15
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 14520-9:2006(E)
©
ISO 2006

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ISO 14520-9:2006(E)
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ii ISO 2006 – All rights reserved

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ISO 14520-9:2006(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.
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 14520-9 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 second edition cancels and replaces the first edition (ISO 14520-9:2000), which has been technically
revised.
ISO 14520 consists of the following parts, under the general title Gaseous fire-extinguishing systems —
Physical properties and system design:
— Part 1: General requirements
— Part 2: CF I extinguishant
3
— Part 5: FK-5-1-12 extinguishant
— Part 6: HCFC Blend A extinguishant
— 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
Parts 3, 4 and 7, which dealt with FC-2-1-8, FC-3-1-10 and HCFC 124 extinguishants, respectively, have been
withdrawn, as these types are no longer manufactured.
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ISO 2006 – All rights reserved iii

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.
iv

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INTERNATIONAL STANDARD ISO 14520-9:2006(E)
Gaseous fire-extinguishing systems — Physical properties and
system design —
Part 9:
HFC 227ea extinguishant
1Scope
This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the
HFC 227ea extinguishant. It includes details of physical properties, specification, usage and safety aspects and
is applicable to systems operating at nominal pressures of 25 bar and 42 bar superpressurized with nitrogen.
This does not preclude the use of other systems.
2 Normative references
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 14520-1:2006, 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.
4Characteristics and uses
4.1 General
Extinguishant HFC 227ea shall comply with the specification according to 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 given in Table 2.
HFC 227ea extinguishes fires mainly by physical means, but also by some chemical means.
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ISO 2006 – All rights reserved 1

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ISO 14520-9:2006(E)
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 Unit Value
Molecular mass — 170
a ◦
Boiling point at 1,013 bar (absolute) C −16,4
◦
Freezing point C −127
◦
Critical temperature C 101,7
a
Critical pressure bar abs 29,26
3
Critical volume cm /mol 274
3
Critical density kg/m 573
◦ a
Vapour pressure 20 C bar abs 3,90
◦ 3
Liquid density 20 C kg/m 1 410
◦ 3
Saturated vapour density 20 C kg/m 31,035
◦ 3
Specific volume of superheated vapour at 1,013 bar and 20 C m /kg 0,1374
Chemical formula CF CHFCF
3 3
Chemical name Heptafluoropropane
a 5 2
1 bar = 0,1 MPa = 10 Pa; .1 MPa = 1 N/mm
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 14520-1:2006, Clause 4.
The extinguishant requirements per volume of protected space are given in Table 3 for various levels of
concentration. These are based on methods given in ISO 14520-1:2006, 7.6.
The extinguishing concentrations and design concentrations for n-heptane and Surface class A hazards are
given in Table 4, those for other fuels in Table 5 and inerting concentrations in Table 6.
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ISO 14520-9:2006(E)
Table 3 — HFC 227ea total flooding quantity
3
Temperature Specific HFC 125 mass requirements per unit volume of protected space, m/V (kg/m )
T vapour This information refers only to HFC 227ea, and may not represent any other products containing
volume 1,1,1,2,3,3,3-heptafluoropropane as a component.
S
Design concentration (by volume)
◦
C m3/kg 6% 7% 8% 9% 10 % 11 % 12 % 13 % 14 % 15 %
−10 0,1215 0,5254 0,6196 0,7158 0,8142 0,9147 1,0174 1,1225 1,2301 1,3401 1,4527
−5 0,1241 0,5142 0,6064 0,7005 0,7967 0,8951 0,9957 1,0985 1,2038 1,3114 1,4216
0 0,1268 0,5034 0,5936 0,6858 0,7800 0,8763 0,9748 1,0755 1,1785 1,2839 1,3918
5 0,1294 0,4932 0,5816 0,6719 0,7642 0,8586 0,9550 1,0537 1,1546 1,2579 1,3636
10 0,1320
...