1、 ISO 2014 Fire protection Foam fire extinguishing systems Part 5: Fixed compressed air foam equipment Protection contre lincendie Installations fixes dextinction par mousse physique Partie 5: quipement fixe pour mousse physique air comprim INTERNATIONAL STANDARD ISO 7076-5 First edition 2014-05-01 R
2、eference number ISO 7076-5:2014(E) ISO 7076-5:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, inclu
3、ding photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested 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
4、 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 7076-5:2014(E) ISO 2014 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Abbreviated terms 3 5 Requirements 3 5.1 Compliance . 3 5.2 G
5、eneral . 3 5.3 Operation and control of systems . 4 6 Tests . 4 6.1 General . 4 6.2 CAF fire extinguishment tests/verification 5 6.3 CAF foam quality measurements 7 6.4 CAF foam discharge devices .10 6.5 CAF generation and proportioning.10 6.6 Salt fog corrosion .11 6.7 Thermal shock 11 7 Test repor
6、t 12 8 Data .12 8.1 Operating instructions 12 8.2 Service and maintenance instructions 13 8.3 Fault causes and corrective actions .14 9 Marking .14 Annex A (normative) Conductivity test procedure .15 Annex B (normative) Low expansion foam fire test configurations .17 Annex C (normative) Low expansio
7、n foam fire test chronology .18 Bibliography .19 ISO 7076-5:2014(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 technica
8、l 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 wit
9、h the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed
10、for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rig
11、hts. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in th
12、is document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers
13、to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 21, Equipment for fire protection and fire fighting, Subcommittee SC 6, Foam and powder media and firefighting systems using foam and powder. ISO 7076 consists of the foll
14、owing parts, under the general title Fire protection Foam fire extinguishing systems: Part 1: Foam proportioning equipment Part 2: Low expansion foam equipment Part 5: Fixed compressed air foam equipment The following parts are under preparation: Part 3: Medium expansion foam equipment Part 4: High
15、expansion foam equipment Part 6: Vehicle mounted compressed air foam systemsiv ISO 2014 All rights reserved ISO 7076-5:2014(E) Introduction This part of ISO 7076 is prepared by ISO/TC 21/SC 6, and is based on FM Global Class 5130 Approval Standard on Foam Extinguishing Systems. Fixed compressed air
16、foam equipment is required to function satisfactorily not only in the event of fire, but also during and after exposure to conditions it is likely to meet in practice, including corrosion, vibration, direct impact, and indirect shock. Specific tests are intended to assess the performance of the equi
17、pment under such conditions. The aim of using such systems is to improve the fire suppression effectiveness of the fire extinguishing agent on the burning materials for both Class A and Class B fires, by producing uniform and more stable bubbles, which improves the cooling effect of the applied medi
18、a. This part of ISO 7076 is not intended to place any other restrictions on the design and construction of fixed compressed air foam equipment. ISO 2014 All rights reserved v Fire protection Foam fire extinguishing systems Part 5: Fixed compressed air foam equipment 1 Scope This part of ISO 7076 spe
19、cifies requirements, test and assessment methods, and performance criteria for fixed compressed air foam equipment of fixed foam extinguishing systems for indoor or outdoor utilization, or both. Technical safety requirements concerning the design and manufacturing of drives, auxiliary equipment, sou
20、rces of energy, or pumps are outside the scope of this part of ISO 7076. Special hazards arising from the particular conditions under which these systems are used are outside the scope of this part of ISO 7076. Hazards relating to any kind of mechanical, electrical, hydraulic, pneumatic, and other e
21、quipment dealt with by the respective standards for such equipment are outside the scope of this part of ISO 7076. Hazards arising from the noise of systems are outside the scope of this part of ISO 7076. 2 Normative references The following documents, in whole or in part, are normatively referenced
22、 in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-1, Environmental testing Part 1: General and guidance ASTM B117, Stan
23、dard practice for operating salt spray (fog) apparatus NFPA 11-2010, Standard for Low-, Medium-, and High-Expansion Foam 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 air delivery rate volume of air, in normal condition, that is fed into a
24、fixed compressed air foam system per unit of time Note 1 to entry: While inside the system, the air volume will be compressed according to the pressure applied. Once it leaves the system from the nozzle to the atmosphere, the air will expand to its normal volume again. 3.2 air/foam solution volume r
25、atio ratio stating how many parts of air (at normal condition) are mixed with one part of the foam solution in a fixed compressed air foam system Note 1 to entry: The ratio is expressed as the pair of values one part foam solution to x parts air (1:x). INTERNATIONAL ST ANDARD ISO 7076-5:2014(E) ISO
26、2014 All rights reserved 1 ISO 7076-5:2014(E) 3.3 approved acceptable to the authority having jurisdiction 3.4 authority having jurisdiction AHJ organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installatio
27、n, or a procedure 3.5 compressed air foam CAF homogenous foam produced by the combination of water, foam concentrate, and air or nitrogen under pressure 3.6 compressed air foam generating method method of generating compressed air foam recognized in this part of ISO 7076 using a mixing chamber to co
28、mbine air or nitrogen under pressure, water, and foam concentrate in the correct proportions Note 1 to entry: The resulting compressed air foam flows through piping to the hazard being protected. 3.7 compressed air foam discharge device device specifically designed to discharge compressed air foam i
29、n a predetermined pattern 3.8 fixed compressed air foam system fixed CAFS system employing compressed air foam discharge devices attached to a piping system through which foam is transported from a mixing chamber Note 1 to entry: Discharge of fixed CAFS begins with automatic actuation of a detection
30、 system, or manual actuation that opens valves permitting compressed air foam, generated in the mixing chamber, to flow through a piping system and discharged over the area served by the discharge devices. 3.9 drainage time 25 % time taken for 25 % of the foam to collapse into solution 3.10 wet foam
31、 foam produced by a fixed compressed air foam system and which has a foam solution/air volume ratio of between 1:3 to 1:10 3.11 dry foam foam produced by a fixed compressed air foam system and which has a foam solution/air volume ratio of more than 1:10 3.12 foam expansion ratio ratio of the volume
32、of expanded foam and its solution 3.13 foam solution mixture of water and foam concentrate2 ISO 2014 All rights reserved ISO 7076-5:2014(E) 3.14 (foam solution) delivery rate Q W volume (of water plus foam concentrate) delivered per unit of time by a system Note 1 to entry: At proportioning ratios o
33、f up to 1 %, the difference between water delivery rate and foam solution delivery rate can be neglected. 3.15 foam quality quality of foam based on foam expansion ratio and 25 % drainage time 3.16 nozzle specially designed device that can discharge foam in a predetermined pattern 3.17 operation pre
34、ssure of the fixed CAF system pressure at the system input connection at which all performance and safety requirements are met and which shall be specified by the fixed compressed air foam system 3.18 operation range range (of conditions) specified by the manufacturer of a system and within which th
35、e system can be operated without limitations while achieving the intended performance characteristics 3.19 proportioning ratio volume of foam concentrate added to water by volume, given as a percentage of the solution 3.20 listed equipment, materials, or services included in a list published by an o
36、rganization that is acceptable to the authority having jurisdiction and concerned with evaluation of production of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has
37、been tested and found suitable for a specified purpose 4 Abbreviated terms CAF compressed air foam CAFS compressed air foam system 5 Requirements 5.1 Compliance In order to comply with this part of ISO 7076, the fixed CAF system shall meet the requirements of this clause, which shall be verified by
38、technical inspection or engineering assessment, shall be tested as specified in Clause 6, and shall meet the requirements of the tests. 5.2 General 5.2.1 The fixed CAF system shall be designed in accordance with the requirements of Chapter 7 of NFPA 11-2010 and of this clause. ISO 2014 All rights re
39、served 3 ISO 7076-5:2014(E) 5.2.2 A fixed CAF system shall generate at least wet foam. 5.2.3 A homogeneous, finely pored foam shall be discharged at the nozzles. 5.3 Operation and control of systems 5.3.1 The operating range(s) for dry foam and wet foam shall be specified by the system manufacturer.
40、 5.3.2 There shall be no compressed air pulses at the fixed CAF system outlet cross section when the system is switched on and off. 5.3.3 Within the operating range and at a foam solution delivery pressure of between 0,4 MPa and 1 MPa, the deviation from the set proportioning ratio shall not exceed
41、a) 0 to +20 % for proportioning ratios up to 1 % and b) 0 to +30 % for proportioning ratios between 1 % and 3 %. 5.3.4 The pressure drop across the fixed CAF system when operated at the nominal delivery rate shall not exceed 0,2 MPa. 5.3.5 The CAF unit shall be equipped with an air pressure regulati
42、ng system that prevents the flow of air when the liquid discharge is interrupted. 5.3.6 System controls shall be designed in accordance with 4.9 of NFPA 11-2010. 6 Tests 6.1 General 6.1.1 CAF shall demonstrate extinguishing performance in Class B fire tests. Fires shall be extinguished by the end of
43、 the allowable discharge time and shall not reignite during the post-extinguishment observation period. 6.1.2 Atmospheric conditions for tests 6.1.2.1 Unless otherwise stated in a test procedure, conduct the testing after the test specimen has been allowed to stabilize in the standard atmospheric co
44、nditions for testing as specified in IEC 60068- 1 as follows: temperature: (15 to 35) C; relative humidity: (25 to 75) %; air pressure: (86 to 106) kPa. 6.1.2.2 The temperature and humidity shall be substantially constant for each test where the standard atmospheric conditions are applied. 6.1.3 Ope
45、rating conditions for tests 6.1.3.1 If a test method requires a specimen, such as nozzle or mixing chamber, to be operational, then connect the specimen to a suitable water supply and foam concentrate having the characteristics required by the manufacturers data. Unless otherwise specified in the te
46、st method, the fixed CAF system 4 ISO 2014 All rights reserved ISO 7076-5:2014(E) parameters applied to the specimen shall be set within the manufacturers specified range(s) and shall remain substantially constant throughout the tests. The value chosen for each parameter shall normally be the nomina
47、l value, or the mean of the specified range. 6.1.3.2 The details of the water supply and foam concentrate used shall be given in the test report (see Clause 7). 6.2 CAF fire extinguishment tests/verification 6.2.1 The fire test pan (see Figure 1) shall be square and fabricated of steel with a minimu
48、m thickness of 4,8 mm. The inside dimensions shall be 2,16 m 2by a minimum of 305 mm deep. All surfaces shall meet at 90 angles and shall be joined by continuous, liquid-tight welds. The upper edge of the pan shall be reinforced by an externally attached 38 mm steel angle of 4,8 mm minimum thickness
49、. The angle shall be attached to the pan by continuously welding its outside corner to the top edge of the pan, so that the upper surface of one leg of the angle is flush with the top of the pan and the other leg of the angle is tight against the outside wall of the pan. The lower leg of the angle shall be attached to the pan by approximately 12-mm-long tack welds spaced approximately every 50 mm. The pan can be fitted with a drain connection and lifting lugs below the reinforcing angle, if desired. Other equivale
