SIST ISO 14520-8:2006
(Main)Gaseous fire-extinguishing systems -- Physical properties and system design -- Part 8: HFC 125 extinguishant
Gaseous fire-extinguishing systems -- Physical properties and system design -- Part 8: HFC 125 extinguishant
This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the HFC 125 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.
Systèmes d'extinction d'incendie utilisant des agents gazeux -- Propriétés physiques et conception des systèmes -- Partie 8: Agent extincteur HCFC 125
Naprave za gašenje s plinom - Fizikalne lastnosti in projektiranje - 8. del: Gasilo HFC 125
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INTERNATIONAL ISO
STANDARD 14520-8
Second edition
2006-02-15
Gaseous fire-extinguishing systems —
Physical properties and system design —
Part 8:
HFC 125 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 8: Agent extincteur HCFC 125
Reference number
ISO 14520-8:2006(E)
©
ISO 2006
---------------------- Page: 1 ----------------------
ISO 14520-8:2006(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 2006
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
Published in Switzerland
©
ii ISO 2006 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 14520-8:2006(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 14520-8 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 14520-8:2000), 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 2006 – All rights reserved iii
---------------------- Page: 3 ----------------------
.
iv
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INTERNATIONAL STANDARD ISO 14520-8:2006(E)
Gaseous fire-extinguishing systems — Physical properties and
system design —
Part 8:
HFC 125 extinguishant
1Scope
This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the
HFC 125 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 125 shall comply with the specification according to Table 1.
HFC 125 is a colourless, almost odourless electrically non-conductive gas with a density approximately four
times that of air.
The physical properties are given in Table 2.
HFC 125 extinguishes fires mainly by physical means, but also by some chemical means.
©
ISO 2006 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 14520-8:2006(E)
Table 1 — Specification for HFC 125
Property Requirement
Purity 99,6 % by mass, min.
−4
Acidity 3× 10 % by mass (3 ppm), max.
−4
Water content 10× 10 % by mass (10 ppm), max.
Non-volatile residue 0,01 % by mass, max.
Suspended matter or sediment None visible
Table 2 — Physical properties of HFC 125
Property Unit Value
Molecular mass — 120,02
a ◦
Boiling point at 1,013 bar (absolute) C −48,09
◦
Freezing point C −101
◦
Critical temperature C 66,02
a
Critical pressure bar abs 36,18
3
Critical volume cm /mol 210
3
Critical density kg/m 573,6
◦ a
Vapour pressure 20 C bar abs 12,05
◦ 3
Liquid density 20 C kg/m 1 218,0
◦ 3
Saturated vapour density 20 C kg/m 77,97
◦ 3
Specific volume of superheated vapour at 1,013 bar and 20 C m /kg 0,1972
Chemical formula CF CHF
3 2
Chemical name Pentafluoroethane
a 5 2
1 bar = 0,1 MPa = 10 Pa; .1 MPa = 1 N/mm
4.2 Use of HFC 125 systems
HFC 125 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, and those for other fuels in Table 5.
©
2 ISO 2006 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 14520-8:2006(E)
Table 3 — HFC 125 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 125, and may not represent any other products containing
volume pentafluoroethane as a component.
S
Design concentration (by volume)
◦ 3
C m /kg 7% 8% 9% 10 % 11 % 12 % 13 % 14 % 15 % 16 %
−45 0,1497 0,5028 0,5809 0,6607 0,7422 0,8256 0,9109 0,9982 1,0874 1,1788 1,2724
−40 0,1534 0,4907 0,5669 0,6447 0,7243 0,8057 0,8889 0,9741 1,0612 1,1504 1,2417
−35 0,1572 0,4788 0,5532 0,6291 0,7068 0,7862 0,8675 0,9505 1,0356 1,1226 1,2117
−30 0,1608 0,4681 0,5408 0,6151 0,6910 0,7686 0,8480 0,9293 1,0124 1,0975 1,1846
−25 0,1645 0,4576 0,5286 0,6012 0,6754 0,7513 0,8290 0,9084 0,9896 1,0728 1,1579
−20 0,1682 0,4475 0,5170 0,5880 0,6606 0,7348 0,8107 0,8884 0,9678 1,0492 1,1324
−15 0,1719 0,4379 0,5059 0,5753 0,6464 0,7190 0,7933 0,8693 0,9470 1,0266 1,1081
−10 0,1755
...
SLOVENSKI STANDARD
SIST ISO 14520-8:2006
01-november-2006
Naprave za gašenje s plinom - Fizikalne lastnosti in projektiranje - 8. del: Gasilo
HFC 125
Gaseous fire-extinguishing systems -- Physical properties and system design -- Part 8:
HFC 125 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux -- Propriétés physiques et
conception des systèmes -- Partie 8: Agent extincteur HCFC 125
Ta slovenski standard je istoveten z: ISO 14520-8:2006
ICS:
13.220.10 Gašenje požara Fire-fighting
SIST ISO 14520-8:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 14520-8:2006
---------------------- Page: 2 ----------------------
SIST ISO 14520-8:2006
INTERNATIONAL ISO
STANDARD 14520-8
Second edition
2006-02-15
Gaseous fire-extinguishing systems —
Physical properties and system design —
Part 8:
HFC 125 extinguishant
Systèmes d'extinction d'incendie utilisant des agents gazeux —
Propriétés physiques et conception des systèmes —
Partie 8: Agent extincteur HCFC 125
Reference number
ISO 14520-8:2006(E)
©
ISO 2006
---------------------- Page: 3 ----------------------
SIST ISO 14520-8:2006
ISO 14520-8:2006(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 2006
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
Published in Switzerland
©
ii ISO 2006 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 14520-8:2006
ISO 14520-8:2006(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 14520-8 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 14520-8:2000), 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 2006 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 14520-8:2006
.
iv
---------------------- Page: 6 ----------------------
SIST ISO 14520-8:2006
INTERNATIONAL STANDARD ISO 14520-8:2006(E)
Gaseous fire-extinguishing systems — Physical properties and
system design —
Part 8:
HFC 125 extinguishant
1Scope
This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the
HFC 125 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 125 shall comply with the specification according to Table 1.
HFC 125 is a colourless, almost odourless electrically non-conductive gas with a density approximately four
times that of air.
The physical properties are given in Table 2.
HFC 125 extinguishes fires mainly by physical means, but also by some chemical means.
©
ISO 2006 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 14520-8:2006
ISO 14520-8:2006(E)
Table 1 — Specification for HFC 125
Property Requirement
Purity 99,6 % by mass, min.
−4
Acidity 3× 10 % by mass (3 ppm), max.
−4
Water content 10× 10 % by mass (10 ppm), max.
Non-volatile residue 0,01 % by mass, max.
Suspended matter or sediment None visible
Table 2 — Physical properties of HFC 125
Property Unit Value
Molecular mass — 120,02
a ◦
Boiling point at 1,013 bar (absolute) C −48,09
◦
Freezing point C −101
◦
Critical temperature C 66,02
a
Critical pressure bar abs 36,18
3
Critical volume cm /mol 210
3
Critical density kg/m 573,6
◦ a
Vapour pressure 20 C bar abs 12,05
◦ 3
Liquid density 20 C kg/m 1 218,0
◦ 3
Saturated vapour density 20 C kg/m 77,97
◦ 3
Specific volume of superheated vapour at 1,013 bar and 20 C m /kg 0,1972
Chemical formula CF CHF
3 2
Chemical name Pentafluoroethane
a 5 2
1 bar = 0,1 MPa = 10 Pa; .1 MPa = 1 N/mm
4.2 Use of HFC 125 systems
HFC 125 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, and those for other fuels in Table 5.
©
2 ISO 2006 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 14520-8:2006
ISO 14520-8:2006(E)
Table 3 — HFC 125 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 125, and may not represent any other products containing
volume pentafluoroethane as a component.
S
Design concentration (by volume)
◦ 3
C m /kg 7% 8% 9% 10 % 11 % 12 % 13 % 14 % 15 % 16 %
−45 0,1497 0,5028 0,5809 0,6607 0,7422 0,8256 0,9109 0,9982 1,0874 1,1788 1
...
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