1、 Reference number ISO 6944-2:2009(E) ISO 2009INTERNATIONAL STANDARD ISO 6944-2 First edition 2009-06-15 Fire containment Elements of building construction Part 2: Kitchen extract ducts Endiguement du feu lments de construction Partie 2: Conduits de ventilation de la cuisine ISO 6944-2:2009(E) PDF di
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6、 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 ii ISO 2009 All rights reservedISO 6944-2:2009(E) ISO 2009 All rights reserved iii Conten
7、ts Page Foreword iv Introduction v 1 Scope 1 2 Normative references 1 3 Terms and definitions .1 4 Test equipment 2 4.1 Fire outside duct2 4.2 Fire inside duct 2 5 Test conditions 3 5.1 Fire outside duct3 5.2 Fire inside duct 3 6 Instrumentation3 6.1 Fire outside duct3 6.2 Fire inside duct 3 7 Test
8、construction.8 7.1 Fire outside duct8 7.2 Fire inside duct 8 8 Test procedure.9 8.1 Fire outside duct9 8.2 Fire inside duct 9 9 Performance criteria11 9.1 Fire outside duct11 9.2 Fire inside duct 11 10 Expression of results 11 11 Test report 12 Annex A (normative) Optional test equipment and instrum
9、entation Fire inside duct 13 Annex B (informative) Historical information.15 Bibliography 17 ISO 6944-2:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of pre
10、paring 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
11、 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
12、 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
13、 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 6944-2 was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 2, Fire containment. IS
14、O 6944 consists of the following parts, under the general title Fire containment Elements of building construction: Part 1: Ventilation ducts Part 2: Kitchen extract ducts ISO 6944-2:2009(E) ISO 2009 All rights reserved v Introduction The purpose of this part of ISO 6944 is to measure the ability of
15、 a representative duct or duct assembly that is part of a kitchen extract duct system to resist the spread of fire from one fire compartment to another with the fire attack being from either the inside of the duct or from the outside of the duct. This part of ISO 6944 is applicable to vertical and h
16、orizontal ducts, with or without branches, taking into account joints and exhaust openings, as well as suspension devices and penetration points. The test method representing a fire attack from the inside of the duct first simulates temperatures within a kitchen extract duct during normal operation
17、followed by simulating the temperatures during a fire within the duct. For kitchen extract ducts, the inevitable build-up of grease on the inside surfaces can lead to a severe fire exposure and this is represented in the test method described in this part of ISO 6944. A burner assembly, attached to
18、a horizontal L-shaped combustion chamber, develops the heat required to obtain the temperatures. The combustion chamber is attached to the sample kitchen extract duct assembly. The kitchen extract duct is also L-shaped with both horizontal and vertical components. The test method representing a fire
19、 attack from the outside of the duct exposes the kitchen extract duct to furnace conditions defined in ISO 834-1. The test method includes provisions for assessment of the penetration seal surrounding the kitchen extract as the duct passes through a fire resistive barrier. The test method evaluates
20、the structural integrity of the kitchen extract duct by having the duct restrained within the furnace during the fire exposure. INTERNATIONAL STANDARD ISO 6944-2:2009(E) ISO 2009 All rights reserved 1 Fire containment Elements of building construction Part 2: Kitchen extract ducts CAUTION The attent
21、ion of all persons concerned with managing and carrying out of this fire resistance test is drawn to the fact that fire testing can be hazardous and there is a possibility that toxic and/or harmful smoke and gases can be evolved during the test. Mechanical and operational hazards can also arise duri
22、ng the construction of the test elements or structures, their testing and disposal of test residues. It is strongly recommended that the duct assembly be allowed to cool completely after the fire test before dismantling to minimize the possibility of the ignition of combustible residues. An assessme
23、nt of all potential hazards and risks to health shall be made and safety precautions shall be identified and provided. Written safety instructions shall be issued. Appropriate training shall be given to relevant personnel. Laboratory personnel shall ensure that they follow written safety instruction
24、s at all times. 1 Scope This part of ISO 6944 establishes a method of test in which kitchen extract ducts are required to provide fire resistance. The requirements are intended to limit the spread of fire from the duct when a fire occurs within the duct and assesses the structural integrity of the d
25、uct when a fire occurs in the area surrounding the duct. 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 (incl
26、uding any amendments) applies. ISO 834-1, Fire-resistance tests Elements of building construction Part : General requirements ISO 69441:2008, Fire containment Elements of building construction Part 1: Ventilation ducts ISO 13943, Fire safety Vocabulary 3 Terms and definitions For the purposes of thi
27、s document, the terms and definitions given in ISO 6944-1, ISO 13943 and the following apply. 3.1 kitchen extract duct exhaust duct intended for use in commercial kitchens ISO 6944-2:2009(E) 2 ISO 2009 All rights reserved3.2 fire-resisting kitchen extract ducts kitchen extract ducts that have been t
28、ested to this part of ISO 6944 and meet the prescribed levels of fire resistance 4 Test equipment 4.1 Fire outside duct The test equipment specified in ISO 6944-1 for testing duct A shall be used, except that the fan, volume flow- measuring station and the condensing unit are not required. 4.2 Fire
29、inside duct 4.2.1 A gas-fired premix burner assembly shall be used to supply flue gases to the test specimen. 4.2.2 The burner assembly shall be placed at the inlet of an insulated, L-shaped combustion chamber assembly, as illustrated in Figure 1. Key 1 kitchen extract duct 5 location of burner asse
30、mbly 2 transition section, where required 6 cleanout access cover 3 combustion chamber 7 supports 4 ceramic fibre insulation on combustion chamber L 1to L 6various governing dimensions Figure 1 Test assembly 4.2.2.1 The minimum total length of the L-shaped insulated combustion chamber, L 1+ L 2 , sh
31、all be 3 700 mm. 4.2.2.2 The minimum height and width of the steel duct for the combustion chamber shall be 700 mm by 700 mm. 4.2.2.3 The minimum thickness of the ceramic fibre insulation for the combustion chamber shall be 50 mm. The density of the insulation shall be 120 kg/m 3 30 kg/m 3 . ISO 694
32、4-2:2009(E) ISO 2009 All rights reserved 3 4.2.3 Combustion shall be complete within the combustion chamber assembly. The insulated combustion chamber assembly shall be connected to the kitchen extract duct by means of bolted or clamped flanges. The flanges shall be welded to the combustion chamber
33、and to the kitchen extract duct. 4.2.4 For ducts whose orifice area exceeds 0,75 m 2 , the use of flow restrictors at the exhaust end of the kitchen extract duct to adjust the rate of the flue gases to assist in obtaining the required temperatures within the kitchen extract duct is allowed, provided
34、 that the exhaust remains at least 75 % open. 5 Test conditions 5.1 Fire outside duct The test conditions specified in ISO 6944-1 for testing duct A shall be used. 5.2 Fire inside duct 5.2.1 The specimen shall be tested within a laboratory having ventilation capable of maintaining the build- up of c
35、arbon monoxide to less than 50 l/l 1)throughout the period of any test. The area shall be free of extraneous drafts. The laboratory shall be constructed so that, during any one test, the room temperature in the laboratory does not increase by more than 23 C above the temperature recorded at the begi
36、nning of the test. 5.2.2 The test specimen with respect to moisture content shall be representative of the condition that exists in similar construction in buildings. The condition shall be established by storage in air having 50 % relative humidity at 23 C. 5.2.3 When conditioning to this level is
37、not possible, the test shall be conducted when the dampest portion of the test specimen has achieved an equilibrium moisture content less than that corresponding to drying in air having 75 % relative humidity at 23 3 C. 5.2.4 Exception: The requirements of 5.2.3 are not mandatory when an equilibrium
38、 condition is not achieved within a 12 month conditioning period; or construction is such that drying of the interior of the test specimen is prevented by hermetic sealing of the construction materials. 6 Instrumentation 6.1 Fire outside duct The instrumentation specified in ISO 6944-1 for testing d
39、uct A shall be used. 6.2 Fire inside duct 6.2.1 Flue gas temperatures 6.2.1.1 The thermocouples shall be located within the L-shaped kitchen extract duct as illustrated in Figures 2 and 3. 1) Microlitres per litre is the approximate conversion of the derogated unit “ppm.” ISO 6944-2:2009(E) 4 ISO 20
40、09 All rights reservedKey 1 kitchen extract duct (side view) 2 location of thermocouple grid for measuring flue-gas temperatures Figure 2 Thermocouple locations for measuring flue gas temperatures 6.2.1.2 Flue gas temperatures shall be determined by a thermocouple grid as illustrated in Figure 3. Th
41、e grid shall consist of four thermocouples located inside the kitchen extract duct to measure the flue gas temperature at the mid-length of the horizontal section of the kitchen extract duct assembly; see Figure 2. 6.2.1.3 The thermocouples shall be maximum 1,0 mm, Type K or Type S Inconel-sheathed
42、2)thermocouples with tips projecting 25 + 1,5 mm from the inner ends of the support tubes as illustrated in Figure 3. 6.2.1.4 The dimension a shall be equal to D/4 but not greater than 305 mm. 6.2.1.5 The dimension b shall be equal to W/4 but not greater than 305 mm. 6.2.2 Unexposed surface temperat
43、ures 6.2.2.1 Fixed locations 6.2.2.1.1 Temperatures on the unexposed surfaces shall be measured using thermocouples and pads in accordance with ISO 834-1. 6.2.2.1.2 A minimum of fourteen thermocouples shall be located on the horizontal section of the test specimen. 6.2.2.1.3 Eight thermocouples shal
44、l be symmetrically located around the perimeter of the specimen as shown in Figures 4 and 5. None of the eight thermocouples shall be located over joints in the insulation material. The insulation thickness shall be the minimum at these locations. 2) Inconel TMis an example of a suitable product ava
45、ilable commercially. This information is given for the convenience of users of this part of ISO 6944 and does not constitute an endorsement by ISO of this product. ISO 6944-2:2009(E) ISO 2009 All rights reserved 5 Dimensions in millimetres Key 1 kitchen extract duct 2 support tube for thermocouples
46、3 location of thermocouple tip, represented by “ ” aDimension a shall be equal to D/4 but not greater than 305 mm. bDimension b shall be equal to W/4 but not greater than 305 mm. Figure 3 Thermocouple grid Flue gas temperatures ISO 6944-2:2009(E) 6 ISO 2009 All rights reservedDimensions in millimetr
47、es Key 1 transition section 2 test specimen 3 thermocouple grid location measuring flue gas temperature 4 cleanout access cover 5 location of thermocouple tips, represented by “ ” 9, 10 location of thermocouples 9 and 10, respectively NOTE See Figure 5 for section A-A and section B-B. Figure 4 Therm
48、ocouple locations Unexposed surface ISO 6944-2:2009(E) ISO 2009 All rights reserved 7a) Section A-A b) Section B-B Key 1 to 8 location, represented by “ ”, of thermocouples 1 to 8, respectively 9 insulating system 10 kitchen extract duct Figure 5 Thermocouple locations on sections A-A and B-B of Fig
49、ure 4 6.2.2.1.4 Two thermocouples shall be placed around the edges of the cleanout access cover as shown in Figure 4. ISO 6944-2:2009(E) 8 ISO 2009 All rights reserved6.2.2.1.5 Two thermocouples shall be located over horizontal joints in the insulation material and two thermocouples shall be located over vertical joints in the insulation material. These thermocouples shall be located between 75 mm and 380 mm from the mid-length of the horizontal section of the kitchen extract
