1、 Reference number ISO 7203-3:2011(E) ISO 2011INTERNATIONAL STANDARD ISO 7203-3 Second edition 2011-08-01 Fire extinguishing media Foam concentrates Part 3: Specification for low-expansion foam concentrates for top application to water- miscible liquids Agents extincteurs mulseurs Partie 3: Spcificat
2、ions pour les mulseurs bas foisonnement destins une application par le haut sur les liquides miscibles leau ISO 7203-3:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
3、 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 + 41 22 749 09 47 E-mail copyrigh
4、tiso.org Web www.iso.org Published in Switzerland ii ISO 2011 All rights reservedISO 7203-3:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword . v Introduction vi 1 Scope 1 2 Normative references 1 3 Terms and definitions . 2 4 Grades and uses of foam concentrates 3 4.1 Grades 3 4.2 Use
5、with sea water 4 5 Tolerance of the foam concentrate to freezing and thawing 4 6 Sediment in the foam concentrate . 4 6.1 Sediment before ageing 4 6.2 Sediment after ageing . 4 7 Viscosity of the foam concentrate . 4 7.1 Newtonian foam concentrates . 4 7.2 Pseudo-plastic foam concentrates 4 8 pH of
6、the foam concentrate 4 8.1 pH limits . 4 8.2 Sensitivity to temperature 5 9 Surface tension of the foam solution 5 9.1 Before temperature conditioning . 5 9.2 Temperature sensitivity 5 10 Interfacial tension between the foam solution and cyclohexane . 5 10.1 Before temperature conditioning . 5 10.2
7、Temperature sensitivity 5 11 Spreading coefficient of the foam solution on cyclohexane 5 12 Expansion and drainage of foam . 6 12.1 Expansion 6 12.2 Drainage . 6 13 Test fire performance 6 14 Marking, packaging and specification sheet 7 14.1 Marking . 7 14.2 Packaging . 7 14.3 Specification sheet 7
8、Annex A (normative) Preliminary sampling and conditioning of the foam concentrate . 8 Annex B (normative) Determination of tolerance to freezing and thawing 9 Annex C (normative) Determination of percentage of sediment . 11 Annex D (normative) Determination of viscosity for pseudo-plastic foam conce
9、ntrates . 12 Annex E (normative) Determination of surface tension, interfacial tension and spreading coefficient . 14 Annex F (normative) Determination of expansion and drainage time 15 Annex G (normative) Determination of test fire performance 20 ISO 7203-3:2011(E) iv PROOF/PREUVE ISO 2011 All righ
10、ts reservedAnnex H (informative) Small-scale fire test 24 Annex I (informative) Description of a radiation measurement method 34 Annex J (informative) Compatibility 38 Bibliography 39 ISO 7203-3:2011(E) ISO 2011 All rights reserved vForeword ISO (the International Organization for Standardization) i
11、s 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 represe
12、nted 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 d
13、rafted 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
14、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 7203-3 was prepa
15、red by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting, Subcommittee SC 6, Foam and powder media and fixed firefighting system using foam and powder. This second edition cancels and replaces the first edition (ISO 7203-3:1999), which has been technically revised. ISO 7
16、203 consists of the following parts, under the general title Fire extinguishing media Foam concentrates: Part 1: Specifications for low-expansion foam concentrates for top application to water-immiscible liquids Part 2: Specification for medium- and high-expansion foam concentrates for top applicati
17、on to water- immiscible liquids Part 3: Specification for low-expansion foam concentrates for top application to water-miscible liquids ISO 7203-3:2011(E) vi PROOF/PREUVE ISO 2011 All rights reservedIntroduction Firefighting foams are widely used to control and extinguish fires of flammable liquids
18、and for inhibiting reignition. They can also be used to prevent the 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 the subjec
19、t 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 (all parts) 1) designed in accordance with this part of ISO 7203 is being prepared and will be published as ISO 7076 (all parts). Attention is drawn to Anne
20、x J, which deals with the compatibility of foam concentrates, and the compatibility of foams and powders. 1) To be published. INTERNATIONAL STANDARD ISO 7203-3:2011(E) ISO 2011 All rights reserved 1Fire extinguishing media Foam concentrates Part 3: Specification for low-expansion foam concentrates f
21、or top application to water-miscible liquids 1 Scope This part of ISO 7203 specifies the essential properties and performance of liquid foam concentrates used to make low-expansion foams for the control, extinction and inhibition of reignition of fires of water-miscible liquids. Minimum performance
22、on certain test fires is specified. These foams are suitable for top application to fires of water-miscible liquids. Those foams that also comply with ISO 7203-1 are also suitable for top application to fires of water-immiscible liquids. The foam concentrates can be suitable for use in non-aspiratin
23、g sprayers or for subsurface application to liquid fires, but requirements specific to those applications are not included in this part of ISO 7203. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the editio
24、n 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 and opaque liquids Determination of kinematic
25、 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 requirements and testing Part 1: Test sieves of met
26、al 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 7203-2, Fire extinguishing media Foam concentrates Part 2: Specification for medium- and high-
27、expansion foam concentrates for top application to water-immiscible liquids BS 5117-1.3, Testing corrosion inhibiting, engine coolant concentrate (antifreeze). Methods of test for determination of physical and chemical properties. Determination of freezing point ISO 7203-3:2011(E) 2 ISO 2011 All rig
28、hts 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, foam solution, and foam concentrate 3.
29、2 25 % drainage time time for 25 % of the liquid content of a foam to drain out 3.3 expansion ratio of the volume of foam to the volume of the foam solution from which it was made 3.4 low-expansion with expansion in the range 1 to 20, as applied to foam and to associated equipment, systems and conce
30、ntrates 3.5 medium-expansion with expansion in the range 21 to 200, as applied to foam and to associated equipment, systems and concentrates 3.6 high-expansion with expansion greater than 200, as applied to foam and to associated equipment, systems and concentrates 3.7 foam aggregate of air-filled b
31、ubbles formed from an aqueous solution of a suitable foam concentrate 3.8 concentrate liquid that, when mixed with water in the appropriate concentration, gives a foam solution 3.9 protein foam concentration P foam concentrate derived from hydrolized protein materials 3.10 fluoroprotein foam concent
32、rate FP protein foam concentrate with added fluorinated surface active agents 3.11 synthetic foam concentrate S foam concentrate based on a mixture of hydrocarbon surface-active agents and which can contain fluorocarbons with additional stabilizers ISO 7203-3:2011(E) ISO 2011 All rights reserved 33.
33、12 alcohol-resistant foam concentrate AR foam concentrate resistant to breakdown when applied to the surface of alcohol or other water-miscible solvents 3.13 aqueous film-forming foam concentrate AFFF foam concentrate based on a mixture of hydrocarbon and fluorinated surface-active agents with the a
34、bility to form an aqueous film on the surface of some hydrocarbons 3.14 film-forming fluoroprotein foam concentrate FFFP fluoroprotein foam concentrate that has the ability to form an aqueous film on the surface of some hydrocarbons 3.15 foam solution solution of foam concentrate and water 3.16 forc
35、eful application application of foam such that it falls directly onto the surface of a liquid fuel 3.17 gentle application application of foam indirectly to the surface of a liquid fuel via a backboard, tank wall or other surface 3.18 sediment insoluble particles in the foam concentrate 3.19 spreadi
36、ng coefficient value calculated from the measured surface and interfacial tensions to indicate the ability of one liquid to spontaneously spread across the surface of another 3.20 lowest temperature for use temperature claimed by the manufacturer or supplier to be the lowest temperature at which the
37、 foam concentrate can be proportioned correctly using equipment normally available 4 Grades and uses of foam concentrates 4.1 Grades Based on the test fire performance of the foam concentrate (see Clause 13), it shall be graded as class I or II for extinguishing performance; as level A, B or C for b
38、urn-back resistance. ISO 7203-3:2011(E) 4 ISO 2011 All rights reserved4.2 Use with sea water If a foam concentrate is marked as suitable 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 a
39、nd thawing Before and after temperature conditioning in accordance with A.2, the foam concentrate, if claimed by the supplier not to 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 concentrate
40、s complying with Annex B shall be tested for compliance with the appropriate requirements given in other clauses and subclauses of this part of ISO 7203 after freezing and thawing in accordance with A.2.1. 6 Sediment in the foam concentrate 6.1 Sediment before ageing Any sediment in the concentrate
41、prepared in accordance with A.1 shall be dispersible through a 180 m sieve, and the percentage volume of the 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 throu
42、gh a 180 m sieve, and the percentage volume of sediment shall be not more than 1,0 % when tested in accordance with Annex C. 7 Viscosity of the foam concentrate 7.1 Newtonian foam concentrates The viscosity of the foam concentrate at the lowest temperature for use claimed by the manufacturer shall b
43、e determined in accordance with ISO 3104. If the viscosity is 200 mm 2 s 1 , 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 th
44、e viscosity at the lowest temperature for use is greater than or equal to 120 mPas at 375 s 1 , 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, b
45、efore and after temperature conditioning in accordance with A.2, shall be not less than 6,0 and not more than 8,5 at (20 2) C. ISO 7203-3:2011(E) ISO 2011 All rights reserved 58.2 Sensitivity to temperature The difference in pH between before and after temperature conditioning shall not be greater t
46、han 1,0 pH units. 9 Surface tension of the foam solution 9.1 Before temperature conditioning The surface tension 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 characte
47、ristic value when determined in accordance with E.2. 9.2 Temperature sensitivity The surface tension of the foam 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 v
48、alue obtained after temperature conditioning shall not be less than 0,95 times, or more than 1,05 times the value obtained before temperature conditioning. 10 Interfacial tension between the foam solution and cyclohexane 10.1 Before temperature conditioning The difference between the interfacial ten
49、sion between the foam solution prepared from the foam concentrate, before temperature conditioning in accordance with A.2, and cyclohexane (when determined in accordance with E.3) and the characteristic value, shall not exceed 1,0 mN/m or 10 % of the characteristic value, whichever is the greater. 10.2 Temperature sensitivity The interfacial tension between the foam solution prepared from the foam concentrate, after temperature conditioning in accordance with A.2, and cyc
