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1、AS 45672005 Australian Standard Twin wall metal fluesGas appliances AS 45672005 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 This Australian Standard was prepared by Committee AG-006, Gas Installation Committee. It was approved on behalf of the Council of Standards Australia on 10 Januar
2、y 2005. This Standard was published on 21 February 2005. The following are represented on Committee AG-006: AGA Certification Services Australian Liquefied Petroleum Gas Association Energy Networks Association Gas Appliance Manufacturers Association of Australia Gas Technical Regulators Committee Ke
3、eping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is
4、 important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased. Detailed information about Standards can be found by visiting the Standards Web Shop at .au and looking up the relevant Sta
5、ndard in the on-line catalogue. Alternatively, the printed Catalogue provides information current at 1 January each year, and the monthly magazine, The Global Standard, has a full listing of revisions and amendments published each month. Australian StandardsTM and other products and services develop
6、ed by Standards Australia are published and distributed under contract by SAI Global, which operates the Standards Web Shop. We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us
7、 via email at mailstandards.org.au, or write to the Chief Executive, Standards Australia, GPO Box 5420, Sydney, NSW 2001. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 45672005 Australian Standard Twin wall metal fluesGas appliances Originated as AG 6051975. Previous edition AG 6051994
8、. Republished and redesignated as AS 45672005. COPYRIGHT Standards Australia All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Published by Standard
9、s Australia, GPO Box 5420, Sydney, NSW 2001, Australia ISBN 0 7337 6471 1 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 45672005 2 PREFACE This Standard was reviewed by the Standards Australia Committee, AG-006, Gas Installation Committee, to supersede AG 6051987, Approval Requirements
10、 For Twin Wall Metal Flues. The Standard is republished without technical alterations. The objective of this Standard is to provide manufacturers, designers, regulatory authorities, testing laboratories and similar organizations with uniform minimum requirements for the safety, performance and use o
11、f twin wall metal flues. This Standard should not be regarded as a design specification or as an instruction manual. In its preparation, consideration has been given to (a) continuity of satisfactory operation; (b) the prevention of fire hazards, and explosions; (c) the prevention of injury to perso
12、ns or property; (d) gas rules and regulations now in force; and (e) relevant International Standards. The terms normative and informative have been used in this Standard to define the application of the appendix to which they apply. A normative appendix is an integral part of the Standard, whereas a
13、n informative appendix is only for information and guidance. Statements expressed in mandatory terms in notes to tables and figures are deemed to be requirements of this Standard. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 3 AS 45672005 CONTENTS Page SECTION 1 GENERAL 1.1 SCOPE 4 1.2 C
14、LASSIFICATION.4 1.3 DEFINITIONS 4 SECTION 2 DESIGN AND CONSTRUCTION 2.1 MATERIALS 6 2.2 CONSTRUCTION.6 2.3 DESIGN 6 2.4 MARKINGS7 2.5 INSTRUCTIONS 8 SECTION 3 REQUIREMENTS FOR TYPE 1 TWIN WALL FLUES 3.1 COMPONENTS9 3.2 SIZES9 3.3 SUPPORT PLATES9 3.4 FLUE CONNECTION ELBOW AND ELBOW HOUSING .9 SECTION
15、 4 REQUIREMENTS FOR TYPE 2 TWIN WALL FLUES 4.1 COMPONENTS 11 4.2 SIZES 11 4.3 SUPPORT PLATES 11 4.4 FLUE CONNECTION ELBOW AND ELBOW HOUSING . 11 SECTION 5 REQUIREMENTS FOR TYPE 3 TWIN WALL FLUES 5.1 COMPONENTS 13 5.2 SIZES 13 SECTION 6 PERFORMANCE 6.1 GENERAL 14 6.2 OPERATING CHARACTERISTICS 14 6.3
16、MECHANICAL STRENGTH . 14 APPENDICES A FIGURES . 15 B METHODS OF TEST 22 C LIST OF REFERENCED DOCUMENTS . 30 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 45672005 4 Standards Australia .au STANDARDS AUSTRALIA Australian Standard Twin wall metal fluesGas appliances S E C T I O N 1 G E N
17、 E R A L 1.1 SCOPE These requirements cover twin wall flue and components, excluding flue cowls (refer AS 4566), used for flueing gas appliances with a maximum flue gas temperature of 270C. Flue approved in accordance with these requirements is not suitable for installation where it is inaccessible
18、and subject to continuous condensation. 1.2 CLASSIFICATION Twin wall flues shall be classified according to type as follows: (a) Type 1 Rectangular twin wall flues designed for installation within standard wall cavities of 75 mm nominal width and for appliances with a gas consumption not exceeding 5
19、0 MJ/h. (b) Type 2 Twin wall flues designed for installation within standard wall cavities of 95 mm nominal width and for appliances with a gas consumption not exceeding 50 MJ/h. (c) Type 3 Other twin wall flues not exceeding 300 mm nominal diameter or equivalent. 1.3 DEFINITIONS For the purpose of
20、this Standard, the following definitions apply: 1.3.1 Approved Acceptable to, and meeting the prescribed standards of, the authority having jurisdiction. 1.3.2 Authority The authority having jurisdiction or such authority as delegated. (Technical regulator). 1.3.3 Base plate A device used to support
21、 the weight of the appliance and to locate it. 1.3.4 Certified Assessed by a certifying body and having a certificate number to demonstrate compliance with a Standard. 1.3.5 Certifying body A body acceptable to the technical regulator that provides assurance of compliance of appliances and component
22、s with nominated Standards and other accepted safety criteria. 1.3.6 Draught diverter A device, without moving parts, fitted in the flue of an appliance for isolating the combustion system from the effects of pressure changes in the secondary flue. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar
23、 2008 5 AS 45672005 .au Standards Australia 1.3.7 Flue The passage through which flue gases are conveyed from an appliance to a discharge point excluding draught diverter, barometric device, fan or similar part. 1.3.8 Flue connection A device incorporated in an appliance for the connection of a flue
24、 or draught diverter, barometric device, fan or similar part. NOTE: Where the draught diverter, barometric device, fan or similar component is an integral part of the appliance, the discharge point of the integral part shall be deemed to be the flue connection. 1.3.9 Flue connection elbow A right an
25、gle piece between the flue connection and the flue. 1.3.10 Flue connection elbow housing A device for supporting and positively locating a twin wall flue within a wall cavity, and for housing and positively locating a flue connection elbow for a space heater. 1.3.11 Flue system The passage through w
26、hich flue gases are conveyed from an appliance to a discharge point including draught diverter, barometric device, fan or similar part. 1.3.12 Header assembly A device for supporting and positively locating a twin wall flue within a wall cavity for a wall furnace. 1.3.13 Header plate A device for po
27、sitively locating a twin wall flue within a wall cavity. 1.3.14 Outer casing The case enclosing the inner flue conduit of a twin wall flue. 1.3.15 Sealing plate A plate used to support and seal the transition piece to the flue. It prevents the entry of excess air into the flue. 1.3.16 Support bracke
28、t A metal bracket attached to the outer skin of the flue and intended to support and locate the sealing plate and the transition piece. 1.3.17 Technical regulator The Government appointed person, body or authority that has jurisdiction over gas safety legislation (or other entity authorized by that
29、person, body or authority). 1.3.18 Top plate support The device for positively positioning the flue where it passes through or into the ceiling space and for bracing the top plate. 1.3.19 Twin wall flue A type of flue in which the inner flue conduit is encased by an outer casing of specific dimensio
30、ns. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 45672005 6 Standards Australia .au S E C T I O N 2 D E S I G N A N D C O N S T R U C T I O N 2.1 MATERIALS 2.1.1 Non-combustible and corrosion-resistant A gas flue part shall be made of non-combustible corrosion-resistant materials. Met
31、als shall not be used in combinations such as to cause detrimental galvanic action which will adversely affect any part of the assembly. 2.1.2 Sheet metal thickness The minimum thickness of sheet metal, including any coatings, shall comply with Table 2.1, unless otherwise specified. TABLE 2.1 MINIMU
32、M THICKNESS OF SHEET METAL Materials mm Aluminium alloys (1100, 3003) - inner pipe 0.30 Aluminium alloys (1100, 3003) - other use 0.40 Galvanized steel (275 g of zinc per m2) 0.45 Aluminium coated steel (122 g per m2) 0.45 Stainless steel (Type 430 and 300 Series) 0.30 Zinc/Aluminium alloy coated st
33、eel (150 g per m2) 0.45 2.1.3 Aluminium alloys Aluminium alloys containing more than 1.0% magnesium shall not be used if the reflectivity of the material is utilized to reduce fire hazard. 2.1.4 Durability and resistance A flue gas conveying conduit shall be of material having durability and resista
34、nce to corrosion and heat equivalent to that of Type 1100 aluminium or Type 430 stainless steel conforming to the requirements contained herein. Other parts in contact with the flue gases or subject to condensation shall be of material having durability and resistance to corrosion and heat equivalen
35、t to Type 1100 aluminium or aluminium-coated steel. 2.2 CONSTRUCTION An outer casing or other structural part (exclusive of the flue gas conveying conduit) whose failure would cause the gas flue to collapse or fail, shall be made of material having durability and resistance to damage, atmospheric co
36、rrosion and fire equivalent to that of galvanized steel having a coating of zinc of 275 (nominal) grams per square metre. 2.3 DESIGN 2.3.1 Nominal cross-sectional The nominal cross-sectional area of the flue gas passage of a flue pipe fitting shall be not less than that of the flue piping with which
37、 it is intended to be used. 2.3.2 Minimum wall gap The gap between the two walls of a twin wall flue pipe section or flue pipe fitting shall not be less than 6 mm in width. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 7 AS 45672005 .au Standards Australia 2.3.3 Joints A joint shall (a) b
38、e a tight fit (metal to metal) when made up in accordance with the manufacturers instructions; (b) not materially reduce the capacity of the flue piping; and (c) be designed not to retain or leak condensation. 2.3.4 Top plate supports and spacers A twin wall gas flue intended for installation within
39、 a wall cavity with other than zero clearance shall be provided with top plate supports designed to locate the flue in the wall cavity. Each length of flue shall include integral spacers that will maintain the minimum required clearance between the outer casing of the flue and the inner surfaces of
40、walls. Such spacers are to be located so that, when lengths are joined, there will be spacers on both sides of and directly adjacent to each joint. 2.3.5 Ready attachment Each part of a gas flue shall be designed for ready attachment of one to the other without requiring alteration, cutting, threadi
41、ng, drilling, welding or similar task by the installer, except that a length of flue pipe may be shortened by cutting if sufficient instructions and/or parts are available to enable the cut length to comply with these requirements. 2.3.6 Definite relationship between flue parts Any parts of a flue w
42、hich bear a definite relationship to any other for proper and safe use shall be arranged and constructed to permit them to be incorporated into the complete assembly only in the correct relationship with each other and without the need for alteration or alignment, or such parts shall be assembled an
43、d shipped from the factory as one element. 2.3.7 Assembly by manufacturers Each gas flue part (such as a flue pipe section, elbow, coupling, tee etc.) shall be completely assembled by the manufacturer at the factory. 2.3.8 Spacer strength All spacers shall have sufficient strength and bearing surfac
44、e to maintain the required clearance between the flue pipe, parts of joists, ceiling and floor material, and the inner surface of walls. 2.3.9 Securing supports A support assembly intended to be secured by nails or screws shall be arranged so that such holding means will be in shear. 2.3.10 Use of s
45、crews Where screws are employed to field-join assemblies, the assemblies shall readily receive screws without being field-punched or field-drilled and a screw shall not extend into a flue inner conduit. Screws and instructions shall be supplied. 2.3.11 Damage free An assembly intended to support the
46、 flue pipe shall not be damaged, nor shall the security of its attachment to the building structure be impaired. 2.4 MARKINGS Each length of flue or component shall be clearly and permanently marked and such marking shall include the following: (a) Manufacturers name and/or trade mark. Accessed by U
47、NIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 45672005 8 Standards Australia .au (b) Type or designation. (c) Certificate of compliance number obtained from a certifying body. (d) Direction of flow, if applicable. Markings shall remain legible and durable during normal handling and installation, e.
48、g. to abrasion, humidity and temperature. 2.5 INSTRUCTIONS Instructions in English shall be available, which shall include: (a) Type or designation. (b) Manufacturers or agents name and address. (c) Illustrations, directions and information for attaining proper and safe installation of the gas flue
49、components including the details below: (i) Parts required and the process for installing the gas flue, methods of support, and maintenance of clearances to wall, floor, ceiling, roof, joist construction and building insulation. (ii) Methods and parts to be employed for maintaining ventilation and air circulation where required. (iii) Any limitations with respect to installation