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INTERNATIONAL ISO
STANDARD 14520-14
Second edition
2005-12-15


Gaseous fire-extinguishing systems —
Physical properties and system design —
Part 14:
IG-55 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 14: Agent extincteur IG-55





Reference number
ISO 14520-14:2005(E)
©
ISO 2005

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ISO 14520-14:2005(E)
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ii © ISO 2005 – All rights reserved

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ISO 14520-14:2005(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 14520-14 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 14520-14:2000), 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.
© ISO 2005 – All rights reserved iii

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INTERNATIONAL STANDARD ISO 14520-14:2005(E)

Gaseous fire-extinguishing systems — Physical properties and
system design —
Part 14:
IG-55 extinguishant
1 Scope
This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the
IG-55 extinguishant. It includes details of physical properties, specification, usage and safety aspects and is
applicable to systems operating at nominal pressures of 150 bar, 200 bar and 300 bar, at 15 °C. This does not
preclude the use of other systems; however, design data for other pressures were not available at time of
publication.
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.
1)
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.
4 Characteristics and uses
4.1 General
Extinguishant IG-55 shall comply with the specification according to Table 1.
IG-55 is a colourless, odourless, electrically non-conductive gas with a density approximately the same as that
of air. It is an inert gas mixture consisting nominally of 50 % argon and 50 % nitrogen with the following
mixture specification.
a) Argon: range of (50 ± 5) %.
b) Nitrogen: range of (50 ± 5) %.
The physical properties are given in Table 2.
IG-55 extinguishes fires by a reduction of the oxygen concentration in the atmosphere of the hazard enclosure.

1) To be published. (Revision of ISO 14520-1:2000)
© ISO 2005 – All rights reserved 1

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ISO 14520-14:2005(E)
Table 1 — Specification for IG-55
Property Requirement
Argon Nitrogen
Purity > 99,9 % > 99,9 %
–6 –6
Water content < 15 × 10 < 10 × 10
Only principal contaminants are shown. Other measurements may include
2 2 –6
hydrocarbons, CO, NO, NO , CO , etc. Most are < 20 × 10 .
Table 2 — Physical properties of IG-55
Property Unit Value
Molecular mass — 33,98
a
Boiling point at 1,013 bar (absolute) °C —
Freezing point °C —
Critical temperature °C —
a
Critical pressure bar abs —
3
Critical volume cm/mol —
3
Critical density kg/m —
a
Vapour pressure 20 °C bar abs —
3
Liquid density 20 °C kg/m —
3
Saturated vapour density 20 °C kg/m —
3
Specific volume of superheated vapour at 1,013 bar and 20 °C m/kg 0,708
N 50 % by volume
Chemical formulas
2
Ar 50 % by volume
Chemical names Nitrogen
Argon
a 5 2
1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
4.2 Use of IG-55 systems
IG-55 total flooding systems may be used for extinguishing fires of all classes within the limits specified in
2)
ISO 14520-1:— , Clause 4.
The specific vapour volumes are shown in Table 3. The quantity, Q, of agent required per volume of protected
space is determined using the equation in Table 3.
The extinguishing concentrations and design concentrations for n-heptane and Surface Class A haz
...