1、 ISO 2012 Fire protection Foam fire extinguishing systems Part 2: Low expansion foam equipment Protection contre lincendie Systmes dextinction dincendie mousse Partie 2: quipement pour mousse faible foisonnement INTERNATIONAL STANDARD ISO 7076-2 First edition 2012-05-15 Reference number ISO 7076-2:2
2、012(E) ISO 7076-2:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 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, with
3、out 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 copyrightiso.org Web www.iso.org Published in Switzerland ISO 7076-2:2012(E)
4、ISO 2012 All rights reserved iii Contents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions . 2 4 Requirements . 3 4.1 Connections 3 4.2 Parts for removal during routine field maintenance 3 4.3 Corrosion resistance of metal parts . 3 4.4 Elastomeric joint rings . 3 4.5 Pl
5、astics and reinforced resin materials . 3 4.6 Strength . 4 4.7 Leak resistance 4 4.8 Discharge coefficient (K factor) . 4 4.9 Foam quality . 4 4.10 Water flow 5 4.11 Range of discharge . 5 4.12 Vapour seal . 5 4.13 Operation reliability 5 4.14 Stress corrosion 5 4.15 Salt-spray corrosion . 5 4.16 Li
6、ght and water exposure . 5 4.17 Heat and fire resistance . 6 5 Test methods 6 5.1 General . 6 5.2 Ageing test for plastics and reinforced resin materials . 6 5.3 Liquid exposure test . 6 5.4 Equipment pressurization test . 6 5.5 Leak resistance test 6 5.6 Flow coefficient measurement . 6 5.7 Measure
7、ment of expansion ratio and drainage time . 7 5.8 Water flow test 7 5.9 Range tests for branchpipe and monitor 7 5.10 Vapour sealing test . 7 5.11 Operation reliability test 7 5.12 Stress corrosion test 8 5.13 Salt-spray corrosion test . 8 5.14 Light and water exposure test . 9 5.15 Heat and fire re
8、sistance . 9 6 Marking . 9 7 Manufacturers installation and operation instructions . 9 Annex A (normative) Tolerances 10 Bibliography . 11 ISO 7076-2:2012(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).
9、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-g
10、overnmental, 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
11、. 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
12、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 7076-2 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fir
13、e fighting, Subcommittee SC 6, Foam and powder media and firefighting systems using foam and powder. ISO 7076 consists of the following parts, under the general title Fire protection Foam fire extinguishing systems: Part 1: Foam proportioning equipment Part 2: Low expansion foam equipment Part 5: Co
14、mpressed air foam equipment 1) 1) To be published. iv ISO 2012 All rights reserved INTERNATIONAL STANDARD ISO 7076-2:2012(E) Fire protection Foam fire extinguishing systems Part 2: Low expansion foam equipment 1 Scope This International Standard specifies requirements and test methods for low expans
15、ion foam equipment of fixed-foam extinguishing systems for indoor or outdoor use or both. This International Standard is applicable to sprayers, branchpipes, monitors, low expansion foam generators, foam chambers, etc. 2 Normative references The following referenced documents are indispensable for t
16、he 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 7-1, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances an
17、d designation ISO 179-1, Plastics Determination of Charpy impact properties Part 1: Non-instrumented impact test ISO 180, Plastics Determination of Izod impact strength ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation ISO
18、272, Fasteners Hexagon products Widths across flats ISO 527-1, Plastics Determination of tensile properties Part 1: General principles ISO 885, General purpose bolts and screws Metric series Radii under the head ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part
19、1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch thread ISO 898-2, Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse thread ISO 1179-1, Connections for general use and fluid power Ports and stud ends with ISO 228-1 threads
20、with elastomeric or metal-to-metal sealing Part 1: Threaded ports ISO 4633, Rubber seals Joint rings for water supply, drainage and sewerage pipelines Specification for materials ISO 4759-1,Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C ISO 7005-1, Pipe flan
21、ges Part 1: Steel flanges for industrial and general service piping systems ISO 7005-2, Metallic flanges Part 2: Cast iron flanges ISO 7203-1, Fire extinguishing media Foam concentrates Part 1: Specification for low-expansion foam concentrates for top application to water-immiscible liquids ISO 7203
22、-3, Fire extinguishing media Foam concentrates Part 3: Specification for low-expansion foam concentrates for top application to water-miscible liquids ISO 2012 All rights reserved 1 ISO 7076-2:2012(E) ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests ASTM D638, Standard test metho
23、d for tensile properties of plastics ASTM G155, Standard practice for operating xenon arc light apparatus for exposure of non-metallic materials 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 branchpipe component which projects foam in the f
24、orm of a jet or spray 3.2 discharge coefficient (K factor) “k” factor for the equation K Q P 10 NOTE Q is the flow rate through the component in l/min and P is the inlet pressure in MPa. 3.3 foam chamber component that incorporates a vapour seal, a foam expansion chamber, and which delivers foam int
25、o a flammable or combustible liquid storage tank NOTE A foam generator may be connected to the foam chamber inlet. 3.4 foam expansion ratio ratio of the volume of foam to the volume of the foam solution from which it was made 3.5 foam generator component which introduces air into the foam solution s
26、tream for delivery against a low back pressure, i.e. discharge against atmospheric pressure 3.6 low expansion foam foam which has an expansion ratio not greater than 20 3.7 monitor component consisting of a branchpipe and turret 3.8 sprayer open nozzle which discharges a spray of foam or foam soluti
27、on 3.9 25 % drainage time time for 25 % of the liquid content of a foam to drain out 3.10 vapour seal frangible component designed to prevent tank content vapours from entering the foam pipeline system while allowing foam to flow into the tank during system operation 2 ISO 2012 All rights reserved I
28、SO 7076-2:2012(E) 3.11 high back pressure foam generator component which introduces air into the foam solution stream for delivery against a high back pressure NOTE For example, as is found in tank sub-surface injection. 4 Requirements 4.1 Connections 4.1.1 Permanent connections and joints Permanent
29、 joints shall conform to ISO 7-1, ISO 228-1, ISO 1179-1, ISO 7005-1 or ISO 7005-2, as applicable, or shall conform to other technical specifications valid in the place of use where International Standards are not applicable. 4.1.2 Bolting of pressure-retaining parts Bolts, nuts or studs or both used
30、 to fasten pressure-retaining parts shall conform to ISO 272, ISO 885 and ISO 4759-1, or shall conform to other technical specifications valid in the place of use where International Standards are not applicable. 4.2 Parts for removal during routine field maintenance 4.2.1 Removal Parts intended for
31、 removal during routine field maintenance shall be accessible, removable and replaceable without damage using appropriate tools normally used by the trade, or special tools recommended by the component manufacturer. 4.2.2 Re-assembly The design and construction of any part intended for removal durin
32、g routine field maintenance shall be such that it cannot be re-assembled in a manner other than as intended. 4.3 Corrosion resistance of metal parts Those parts of components that are exposed to foam concentrate or foam solution shall be resistant to corrosion from that exposure. Those parts of comp
33、onents that are intended to freely move during operation or bear against, rotate within, or slide on stationary parts shall be of a corrosion-resistant material. NOTE Bronze is a typical material that has corrosion-resistant properties when exposed to foam concentrate or foam solution. 4.4 Elastomer
34、ic joint rings Elastomeric joint rings shall conform to the requirements of Type W of ISO 4633. 4.5 Plastics and reinforced resin materials 4.5.1 General Plastic or reinforced resin components, which are essential to the operation or safety of the product, shall meet the relevant requirements of 4.5
35、.2 and 4.5.3. ISO 2012 All rights reserved 3 ISO 7076-2:2012(E) 4.5.2 Resistance to ageing After ageing in accordance with 5.2 and the appropriate sections of ISO 527-1, ISO 179-1 and ISO 180, specimens of plastics and reinforced resin materials used for components shall: a) have a tensile strength
36、of no less than 50 % of the value before exposure; b) have an elongation at break of no less than 50 % of the value before exposure; or c) have an impact strength of no less than 50 % of the value before exposure (this method is relevant to stiff plastics, i.e. flexible plastics shall be evaluated u
37、sing the tensile test); d) show no signs of cracking. 4.5.3 Resistance to exposure to liquids Plastics and reinforced resin materials which come into contact with foam concentrate, foam solution or water after exposure to the particular liquid in accordance with 5.3 and the appropriate sections of I
38、SO 527-1, ISO 179-1 and ISO 180, shall a) have a tensile strength of no less than 50 % of the value before exposure; b) have an elongation at break of no less than 50 % of the value before exposure; or c) have an impact strength of no less than 50 % of the value before exposure (this method is relev
39、ant to stiff plastics, i.e. flexible plastics shall be evaluated using the tensile test); d) show no signs of cracking. 4.6 Strength 4.6.1 The pressure-retaining equipment shall withstand, without rupture, an internal hydrostatic pressure of four times the maximum working pressure for a period of 5
40、min when tested as specified in 5.4. 4.6.2 The calculated design load of any fastener, neglecting the force required to compress the gasket, shall not exceed the minimum tensile strength specified in ISO 898-1 and ISO 898-2 when the equipment is pressurized to four times the maximum working pressure
41、. The area of the application of pressure shall be calculated as follows: a) If a full-face gasket is used, the area of application of pressure is that extending out to a line defined by the inner edge of the bolts; b) If an “O”-ring seal or ring gasket is used, the area of application of force is t
42、hat extending out to the centre line of the “O”-ring or gasket. 4.7 Leak resistance The pressure-retaining equipment, shall withstand, for 5 min without leakage, an internal hydrostatic pressure of 1,5 times the maximum working pressure specified by the manufacturer, when tested in accordance with 5
43、.5. 4.8 Discharge coefficient (K factor) The discharge coefficient (K factor) shall be within 5 % of the value stated by the manufacturer when determined in accordance with 5.6. 4.9 Foam quality The expansion and drainage time of foam produced by low expansion foam equipment, using the foam concentr
44、ate recommended by the manufacturer, shall conform to the manufacturers stated values when tested in accordance with 5.7. 4 ISO 2012 All rights reserved ISO 7076-2:2012(E) The foam concentrate characteristic value for foam quality (expansion and 25 % drainage time) as determined in accordance with I
45、SO 7203-1 and ISO 7203-3 (as applicable) shall be considered in determining compatibility of low expansion foam equipment with the foam concentrate. NOTE The expansion and drainage time of non-aspirated foam may be difficult to measure, and therefore there are no corresponding requirements for non-a
46、spirating components. 4.10 Water flow The low expansion foam equipment shall show no loose parts or leakage when tested in accordance with 5.8. 4.11 Range of discharge The range of discharge of the foam branchpipe and monitor shall be not less than the manufacturers stated values when tested in acco
47、rdance with 5.9. 4.12 Vapour seal Tests shall be carried out in accordance with 5.10 and shall meet the following requirements: a) A vapour seal shall not rupture when a positive pressure difference of 0,02 MPa (0,2 bar) is applied to the upstream face; b) A vapour seal shall rupture when the foam g
48、enerator is operating at an inlet pressure of not less than 0,07 MPa (0,7 bar) and no more than 0,20 MPa or no more than the minimum inlet pressure subtracting 0,10 Mpa (1 bar), whichever pressure is less. 4.13 Operation reliability The spring, slider and other movable parts of low expansion foam eq
49、uipment shall be tested individually in accordance with 5.11. After testing, the movable parts shall be reinstalled in the low expansion foam equipment, and the equipment shall operate properly. 4.14 Stress corrosion After being subjected to the conditions described in 5.12, a brass part containing greater than 15 % zinc shall comply with the following requirements: a) show no evidence of cracking when examined using 25x magnification, or b) if there is evidence of cr
