1、 Reference number ISO 7203-2:2011(E) ISO 2011INTERNATIONAL STANDARD ISO 7203-2 Second edition 2011-06-01 Fire extinguishing media Foam concentrates Part 2: Specification for medium- and high- expansion foam concentrates for top application to water-immiscible liquids Agents extincteurs mulseurs Part
2、ie 2: Spcifications pour les mulseurs moyen et haut foisonnements destins une application par le haut sur les liquides non miscibles leau ISO 7203-2:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilize
3、d 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 ISOs 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 + 4
4、1 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2011 All rights reservedISO 7203-2:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword .v Introductionvi 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Classification and uses of foam con
5、centrates.3 4.1 Classification .3 4.2 Use with sea water 3 5 Tolerance of the foam concentrate to freezing and thawing 3 6 Sediment in the foam concentrate.4 6.1 Sediment before ageing4 6.2 Sediment after ageing.4 7 Determination of viscosity for pseudo-plastic foam concentrates4 7.1 Newtonian foam
6、concentrates .4 7.2 Pseudo-plastic foam concentrates4 8 pH of the foam concentrate4 8.1 pH limits4 8.2 Sensitivity to temperature 4 9 Surface tension of the foam solution 4 9.1 Before temperature conditioning.4 9.2 Temperature sensitivity 4 10 Interfacial tension between the foam solution and cycloh
7、exane.5 10.1 Before temperature conditioning.5 10.2 Temperature sensitivity 5 11 Spreading coefficient of the foam solution on cyclohexane 5 12 Expansion and drainage of foam.5 12.1 Medium-expansion foam concentrates Limits 5 12.2 High-expansion foam concentrate Limits 5 13 Test fire performance5 14
8、 Marking, packaging and specification sheet6 14.1 Marking.6 14.2 Packaging.6 14.3 Specification sheet6 Annex A (normative) Preliminary sampling and conditioning of the foam concentrate.7 Annex B (normative) Determination of tolerance to freezing and thawing 8 Annex C (normative) Determination of vol
9、ume percentage of sediment10 Annex D (normative) Determination of viscosity for pseudo-plastic foam concentrates.11 Annex E (normative) Determination of surface tension, interfacial tension and spreading coefficient.13 Annex F (normative) Determination of expansion and drainage time for medium-expan
10、sion foam concentrates 14 ISO 7203-2:2011(E) iv ISO 2011 All rights reservedAnnex G (normative) Determination of expansion and drainage time for high-expansion foam concentrates.19 Annex H (normative) Determination of test fire performance for medium-expansion foam concentrates.25 Annex I (normative
11、) Determination of test fire performance for high-expansion foam concentrates .29 Annex J (normative) Determination of radiation measurement method.33 Annex K (informative) Compatibility .37 Bibliography 38 ISO 7203-2:2011(E) ISO 2011 All rights reserved vForeword ISO (the International Organization
12、 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
13、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. Intern
14、ational 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. Publicati
15、on 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 right
16、s. ISO 7203-2 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting, Subcommittee SC 6, Foam and powder media and fixed firefighting systems using foam and powder. This second edition cancels and replaces the first edition (ISO 7203-2:1995), which has been te
17、chnically revised. ISO 7203 consists of the following parts, under the general title Fire extinguishing media Foam concentrates: Part 1: Specification for low-expansion foam concentrates for top application to water-immiscible liquids Part 2: Specification for medium- and high-expansion foam concent
18、rates for top application to water- immiscible liquids Part 3: Specification for low-expansion foam concentrates for top application to water-miscible liquids ISO 7203-2:2011(E) vi ISO 2011 All rights reservedIntroduction Firefighting foams are widely used to control and extinguish fires of flammabl
19、e liquids and for inhibiting re- ignition. They can also be used to prevent ignition of flammable liquids and, in certain conditions, extinguish fires of solid combustibles. Foams can be used in combination with other extinguishing media, particularly halons, carbon dioxide and powders, which are th
20、e subject of other International Standards including ISO 5923, ISO 6183, ISO 7201-1, ISO 7201-2 and ISO 7202. A specification for foam systems (ISO 7076), which is cited in this part of ISO 7203, is under preparation. Attention is drawn to Annex K, which deals with the compatibility of foam concentr
21、ates, and the compatibility of foams and powders. INTERNATIONAL STANDARD ISO 7203-2:2011(E) ISO 2011 All rights reserved 1Fire extinguishing media Foam concentrates Part 2: Specification for medium- and high-expansion foam concentrates for top application to water-immiscible liquids 1 Scope This par
22、t of ISO 7203 specifies the essential properties and performance of liquid foam concentrates used to make medium- or high-expansion foams or both for the control, extinction and inhibition of reignition of fires of water-immiscible liquids. Minimum performance on certain test fires is specified. The
23、se foams are suitable for top application to fires of water-immiscible liquid. Those foams that comply with ISO 7203-1 are also suitable for top application to fires of water-immiscible liquids. 2 Normative references The following referenced documents are indispensable for the application of this d
24、ocument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 304, Surface active agents Determination of surface tension by drawing up liquid films ISO 3104, Petroleum products Transparent
25、 and opaque liquids Determination of kinematic viscosity and calculation of dynamic viscosity ISO 3219, Plastics Polymers/resins in the liquid state or as emulsions or dispersions Determination of viscosity using a rotational viscometer with defined shear rate ISO 3310-1, Test sieves Technical requi
26、rements and testing Part 1: Test sieves of metal wire cloth ISO 3696:1987, Water for analytical laboratory use Specification and test methods ISO 3734, Petroleum products Determination of water and sediment in residual fuel oils Centrifuge method ISO 7203-1, Fire extinguishing media Foam concentrate
27、s Part 1: Specifications for low-expansion foam concentrates for top application to water-immiscible liquids BS 5117-1.3:1985, Testing corrosion inhibiting, engine coolant concentrate (“antifreeze”). Methods of test for determination of physical and chemical properties. Determination of freezing poi
28、nt ISO 7203-2:2011(E) 2 ISO 2011 All rights reserved3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 characteristic value value declared by the foam concentrate supplier for the chemical and physical properties and the performances of the foam
29、, foam solution, and foam concentrate 3.2 25 % drainage time time for 25 % of the liquid content of a foam to drain out 3.3 50 % drainage time time for 50 % of the liquid content of a foam to drain out 3.4 expansion ratio of the volume of foam to the volume of the foam solution from which it was mad
30、e 3.5 low-expansion with expansion in the range 1 to 20, as applied to foam and to associated equipment, systems and concentrates 3.6 medium-expansion with expansion in the range 21 to 200, as applied to foam and to associated equipment, systems and concentrates 3.7 high-expansion with expansion gre
31、ater than or equal to 200, as applied to foam and to associated equipment, systems and concentrates 3.8 foam firefighting aggregate of air-filled bubbles formed from an aqueous solution of a suitable foam concentrate 3.9 foam concentrate concentrate liquid which, when mixed with water in the appropr
32、iate concentration, gives a foam solution 3.10 protein foam concentration P foam concentrate derived from hydrolised protein materials 3.11 fluoroprotein foam concentrate FP protein foam concentrate with added fluorinated surface-active agents 3.12 synthetic foam concentrate S foam concentrate based
33、 on a mixture of hydrocarbon surface-active agents and which can contain fluorocarbons with additional stabilizers ISO 7203-2:2011(E) ISO 2011 All rights reserved 33.13 alcohol-resistant foam concentrate AR foam concentrate resistant to breakdown when applied to the surface of alcohol or other water
34、-miscible solvents 3.14 aqueous film-forming foam concentrate AFFF foam concentrate based on a mixture of hydrocarbon and fluorinated surface-active agents with the ability to form an aqueous film on the surface of some hydrocarbons 3.15 film-forming fluoroprotein foam concentrate FFFP fluoroprotein
35、 foam concentrate that has the ability to form an aqueous film on the surface of some hydrocarbons 3.16 foam solution solution of foam concentrate and water 3.17 forceful application application of foam such that it falls directly onto the surface of a liquid fuel 3.18 gentle application application
36、 of foam indirectly to the surface of a liquid fuel via a backboard, tank wall or other surface 3.19 sediment insoluble particles in the foam concentrate 3.20 spreading coefficient value calculated from the measured surface and interfacial tensions to indicate the ability of one liquid to spontaneou
37、sly spread across the surface of another 4 Classification and uses of foam concentrates 4.1 Classification The foam concentrate shall be classified as medium- or high-expansion or both and shall comply with the appropriate requirements. 4.2 Use with sea water If a foam concentrate is marked as suita
38、ble for use with sea water, the recommended concentrations for use with fresh water and sea water shall be identical. 5 Tolerance of the foam concentrate to freezing and thawing Before and after temperature conditioning in accordance with A.2, the foam concentrate, if claimed by the supplier not to
39、be adversely affected by freezing and thawing, shall show no visual sign of stratification and non-homogeneity, when tested in accordance with Annex B. Foam concentrates complying with this clause shall be tested for compliance with the appropriate requirements given in other clauses of this part of
40、 ISO 7203 after freezing and thawing in accordance with A.2.1. ISO 7203-2:2011(E) 4 ISO 2011 All rights reserved6 Sediment in the foam concentrate 6.1 Sediment before ageing Any sediment in the concentrate prepared in accordance with A.1 shall be dispersible through a 180 m sieve, and the volume per
41、centage of sediment shall be not more than 0,25 % when tested in accordance with Annex C. 6.2 Sediment after ageing Any sediment in the concentrate aged in accordance with C.1 shall be dispersible through a 180 m sieve, and the volume percentage of sediment shall be not more than 1,0 % when tested i
42、n accordance with Annex C. 7 Determination of viscosity for pseudo-plastic foam concentrates 7.1 Newtonian foam concentrates The viscosity of the foam concentrate at the lowest temperature for use claimed by the manufacturer shall be determined in accordance with ISO 3104. If the viscosity is greate
43、r than 200 mm/s, the container shall be marked “This concentrate can require special proportioning equipment”. 7.2 Pseudo-plastic foam concentrates The viscosity of the foam concentrate shall be determined in accordance with Annex D. If the viscosity at the lowest temperature for use is greater than
44、 or equal to 120 mPa/s at 375/s, the container shall be marked “Pseudo-plastic foam concentrate. This concentrate can require special proportioning equipment”. 8 pH of the foam concentrate 8.1 pH limits The pH of the foam concentrate, before and after temperature conditioning in accordance with A.2,
45、 shall be not less than 6,0 and not more than 8,5 at (20 2) C. 8.2 Sensitivity to temperature The difference in pH between before and after temperature conditioning shall not be greater than 1,0 pH units. 9 Surface tension of the foam solution 9.1 Before temperature conditioning The surface tension
46、of the foam solution prepared from the concentrate, before temperature conditioning in accordance with A.2, at the suppliers recommended concentration, shall be within 10 % of the characteristic value when determined in accordance with E.2. 9.2 Temperature sensitivity The surface tension of the foam
47、 solution prepared from the concentrate, after temperature conditioning in accordance with A.2, at the suppliers recommended concentration, shall be determined in accordance with E.2. The value obtained after temperature conditioning shall not be less than 0,95 times, or more than 1,05 times, the va
48、lue obtained before temperature conditioning. ISO 7203-2:2011(E) ISO 2011 All rights reserved 510 Interfacial tension between the foam solution and cyclohexane 10.1 Before temperature conditioning Before temperature conditioning in accordance with A.2, the difference between the interfacial tension
49、between the foam solution prepared from the foam concentrate and cyclohexane (when determined in accordance with E.3) and the characteristic value for interfacial tension shall not exceed 1,0 mN/m or 10 % of the characteristic value, whichever is the greater. 10.2 Temperature sensitivity After temperature conditioning in accordance with A.2, the interfacial tension between the foam solution prepared from the foam concentrate and cyclohexane shall be determined in accordance with E.
