ISO 14520-15:2005
(Main)Gaseous fire-extinguishing systems — Physical properties and system design — Part 15: IG-541 extinguishant
Gaseous fire-extinguishing systems — Physical properties and system design — Part 15: IG-541 extinguishant
ISO 14520-15:2005 gives specific requirements for gaseous fire-extinguishing systems, with respect to the IG-541 extinguishant.
Systèmes d'extinction d'incendie utilisant des agents gazeux — Propriétés physiques et conception des systèmes — Partie 15: Agent extincteur IG-541
Naprave za gašenje s plinom - Fizikalne lastnosti in projektiranje - 15. del: Gasilo IG-541
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INTERNATIONAL ISO
STANDARD 14520-15
Second edition
2005-12-15
Gaseous fire-extinguishing systems —
Physical properties and system design —
Part 15:
IG-541 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 15: Agent extincteur IG-541
Reference number
ISO 14520-15:2005(E)
©
ISO 2005
---------------------- Page: 1 ----------------------
ISO 14520-15:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
ii © ISO 2005 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 14520-15:2005(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 14520-15 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 14520-15:2000), 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
---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO 14520-15:2005(E)
Gaseous fire-extinguishing systems — Physical properties and
system design —
Part 15:
IG-541 extinguishant
1 Scope
This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the
IG-541 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-541 shall comply with the specification according to Table 1.
IG-541 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 52 % nitrogen, 40 % argon and 8 % carbon dioxide,
with the following mixture specification (based on 8 % carbon dioxide with tolerance of ± 5 %).
a) Carbon dioxide: range of 7,6 % to 8,4 %.
b) Argon: range of 37,2 % to 42,8 %.
c) Nitrogen: range of 48,8 % to 55,2 %.
NOTE Individual container or batch analysis is based on carbon dioxide measurement only.
1) To be published. (Revision of ISO 14520-1:2000)
© ISO 2005 – All rights reserved 1
---------------------- Page: 4 ----------------------
ISO 14520-15:2005(E)
The physical properties are given in Table 2.
IG-541 extinguishes fires mainly by a reduction of the oxygen concentration in the atmosphere of the hazard
enclosure.
Table 1 — Specification for IG-541
Property Requirement
Argon Nitrogen Carbon dioxide
Purity 99,997 % by volume, min. 99,99 % by volume, min. 99,5 % by volume, min.
–6 –6 –6
Water content 4 × 10 by mass, max. 5 × 10 by mass, max. 10 × 10 by mass, max.
–6 –6 –6
Oxygen 3 × 10 by mass, max. 3 × 10 by mass, max. 10 × 10 by mass, max.
Only principal contaminants are shown. Other measurements may include hydrocarbons, CO, NO, NO . Most are
2
–6
< 20 × 10 .
Table 2 — Physical properties of IG-541
Property Unit Value
Molecular mass — 34,0
a
Boiling point at 1,013 bar (absolute) °C −196
Freezing point °C −78,5
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 152
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 0,697
Chemical formulas N 52 % by volume
2
Ar 40 % by volume
CO 8 % by volume
2
Chemical names Nitrogen
Argon
Cabon dioxide
a 5 2
1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
4.2 Use of IG-541 systems
IG-541 total flooding systems may be used for extinguishing fires of all classes within the limits specified in
2)
ISO 14520-1:— , Clause 4.
The extinguishant requirements per volume of protected space are shown in Table 3 for various levels of
2)
concentration. These are based on methods given in ISO 14520-1— , 7.6.
The extinguishing concentrations and design concentrations for n-heptane and Surface Class A hazards are
given in Table 4, concentrations for other fuels in Table 5 and inerting concentrations in Table 6.
2) To be published. (Revision of ISO 14520-1:2000)
2 © ISO 2005 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 14520-15:2005(E)
Table 3 — IG-541 total flooding quantity
3 3
Temperature Specific IG-541 volume requirements per unit volume of protected space, V/V (m /m )
vapour This information refers only to IG-541, and may not represent any other products containing
volume argon, nitrogen or carbon dioxide as components.
T S
Design concentration (by volume)
3
°C m /kg 34 % 38 % 42 % 46 % 50 % 54 % 58 % 62 %
–40 0,5624 0,521 0,600 0,684 0,773 0,870 0,975 1,089 1,214
–35 0,5743 0,511 0,587 0,669 0,757 0,852 0,954 1,066 1,189
–30 0,5863 0,500 0,575 0,656 0,742 0,834 0,935 1,044 1,165
–25 0,5982 0,490 0,564 0,643 0,727 0,818 0,916 1,023 1,142
–20 0,6102 0,481 0,553 0,630 0,713 0,802 0,898 1,003 1,119
–15 0,6221 0,471 0,542 0,618 0,699 0,786 0,881 0,984 1,098
–10 0,6341 0,463 0,532 0,606 0,686 0,772 0,864 0,966 1,077
–5 0,6460 0,454 0,522 0,595 0,673 0,757 0,848 0,948 1,057
0 0,6580 0,446 0,513 0,584 0,661 0,744 0,833 0,931 1,038
5 0,6699 0,438 0,504 0,574 0,649 0,730 0,818 0,914 1,019
10 0,6819 0,430 0,495 0,564 0,638 0,717 0,804 0,898 1,001
15 0,6938 0,423 0,486 0,554 0,627 0,705 0,790 0,882 0,984
20 0,7058 0,416 0,478 0,545 0,616 0,693 0,777 0,868 0,968
25 0,7177 0,409 0,470
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---------------------- Page: 1 ----------------------
INTERNATIONAL ISO
STANDARD 14520-15
Second edition
2005-12-15
Gaseous fire-extinguishing systems —
Physical properties and system design —
Part 15:
IG-541 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 15: Agent extincteur IG-541
Reference number
ISO 14520-15:2005(E)
©
ISO 2005
---------------------- Page: 2 ----------------------
ISO 14520-15:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
ii © ISO 2005 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 14520-15:2005(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 14520-15 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 14520-15:2000), 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
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 14520-15:2005(E)
Gaseous fire-extinguishing systems — Physical properties and
system design —
Part 15:
IG-541 extinguishant
1 Scope
This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the
IG-541 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-541 shall comply with the specification according to Table 1.
IG-541 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 52 % nitrogen, 40 % argon and 8 % carbon dioxide,
with the following mixture specification (based on 8 % carbon dioxide with tolerance of ± 5 %).
a) Carbon dioxide: range of 7,6 % to 8,4 %.
b) Argon: range of 37,2 % to 42,8 %.
c) Nitrogen: range of 48,8 % to 55,2 %.
NOTE Individual container or batch analysis is based on carbon dioxide measurement only.
1) To be published. (Revision of ISO 14520-1:2000)
© ISO 2005 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 14520-15:2005(E)
The physical properties are given in Table 2.
IG-541 extinguishes fires mainly by a reduction of the oxygen concentration in the atmosphere of the hazard
enclosure.
Table 1 — Specification for IG-541
Property Requirement
Argon Nitrogen Carbon dioxide
Purity 99,997 % by volume, min. 99,99 % by volume, min. 99,5 % by volume, min.
–6 –6 –6
Water content 4 × 10 by mass, max. 5 × 10 by mass, max. 10 × 10 by mass, max.
–6 –6 –6
Oxygen 3 × 10 by mass, max. 3 × 10 by mass, max. 10 × 10 by mass, max.
Only principal contaminants are shown. Other measurements may include hydrocarbons, CO, NO, NO . Most are
2
–6
< 20 × 10 .
Table 2 — Physical properties of IG-541
Property Unit Value
Molecular mass — 34,0
a
Boiling point at 1,013 bar (absolute) °C −196
Freezing point °C −78,5
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 152
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 0,697
Chemical formulas N 52 % by volume
2
Ar 40 % by volume
CO 8 % by volume
2
Chemical names Nitrogen
Argon
Cabon dioxide
a 5 2
1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
4.2 Use of IG-541 systems
IG-541 total flooding systems may be used for extinguishing fires of all classes within the limits specified in
2)
ISO 14520-1:— , Clause 4.
The extinguishant requirements per volume of protected space are shown in Table 3 for various levels of
2)
concentration. These are based on methods given in ISO 14520-1— , 7.6.
The extinguishing concentrations and design concentrations for n-heptane and Surface Class A hazards are
given in Table 4, concentrations for other fuels in Table 5 and inerting concentrations in Table 6.
2) To be published. (Revision of ISO 14520-1:2000)
2 © ISO 2005 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 14520-15:2005(E)
Table 3 — IG-541 total flooding quantity
3 3
Temperature Specific IG-541 volume requirements per unit volume of protected space, V/V (m /m )
vapour This information refers only to IG-541, and may not represent any other products containing
volume argon, nitrogen or carbon dioxide as components.
T S
Design concentration (by volume)
3
°C m /kg 34 % 38 % 42 % 46 % 50 % 54 % 58 % 62 %
–40 0,5624 0,521 0,600 0,684 0,773 0,870 0,975 1,089 1,214
–35 0,5743 0,511 0,587 0,669 0,757 0,852 0,954 1,066 1,189
–30 0,5863 0,500 0,575 0,656 0,742 0,834 0,935 1,044 1,165
–25 0,5982 0,490 0,564 0,643 0,727 0,818 0,916 1,023 1,142
–20 0,6102 0,481 0,553 0,630 0,713 0,802 0,898 1,003 1,119
–15 0,6221 0,471 0,542 0,618 0,699 0,786 0,881 0,984 1,098
–10 0,6341 0,463 0,532 0,606 0,686 0,772 0,864 0,966 1,077
–5 0,6460 0,454 0,522 0,595 0,673 0,757 0,848 0,948 1,057
0 0,6580 0,446 0,513 0,584 0,661 0,744
...
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