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1、AS 46282005 Australian Standard Pressure and temperature limit devices for use with gas burners AS 46282005 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 This Australian Standard was prepared by Committee AG-011, Gas Components and Industrial Equipment. It was approved on behalf of the Co
2、uncil of Standards Australia on 14 April 2005. This Standard was published on 1 June 2005. The following are represented on Committee AG-011: AGA Certification Services Appliance and Component Testing Energy Networks Association Engineers Australia Gas Appliance Manufacturers Association of Australi
3、a Gas Appliances and Services Association Gas Technical Regulators Committee LPG Australia Major Industrial Gas Installations Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodica
4、lly reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is 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 purcha
5、sed. Detailed information about Standards can be found by visiting the Standards Web Shop at .au and looking up the relevant Standard 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
6、 a full listing of revisions and amendments published each month. Australian StandardsTM and other products and services developed 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
7、our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Contact us 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 Ma
8、r 2008 AS 46282005 Australian Standard Pressure and temperature limit devices for use with gas burners Originated as AG 2131976. Previous edition 1998. Republished and designated AS 46282005. COPYRIGHT Standards Australia All rights are reserved. No part of this work may be reproduced or copied in a
9、ny form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Published by Standards Australia, GPO Box 5420, Sydney, NSW 2001, Australia ISBN 0 7337 6698 6 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 46282005 2 PREFACE Th
10、is Standard was reviewed by the Standards Australia Committee, AG-011, Gas Components and Industrial Equipment, to supersede AG 213 - 1998, Approval requirements for pressure and temperature limit devices. The Standard is republished without technical alterations. The objective of this Standard is t
11、o provide manufacturers, designers, regulatory authorities, testing laboratories and similar organizations with uniform minimum requirements for the safety, performance and use of pressure and temperature limit devices. This Standard should not be regarded as a design specification or as an instruct
12、ion 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 persons or property; (d) gas rules and regulations now in force; and (e) relevant International Standards. The
13、 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 a Standard, whereas an informative appendix is only for information and guidance. Statements expressed in mandatory terms in not
14、es to tables and figures are deemed to be requirements of this Standard. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 3 AS 46282005 CONTENTS Page SECTION 1 SCOPE AND DEFINITIONS 1.1 SCOPE 4 1.2 DEFINITIONS 4 SECTION 2 DESIGN AND CONSTRUCTION 2.1 MATERIALS 6 2.2 CONSTRUCTION.6 2.3 DESIGN
15、7 2.4 MARKINGS9 2.5 INSTRUCTIONS 10 SECTION 3 PERFORMANCE REQUIREMENTS 3.1 GENERAL 11 3.2 LEAKAGE 11 3.3 OPERATING EFFORT. 11 3.4 MECHANICAL STRENGTH . 11 3.5 REPEATABILITY 11 3.6 DURABILITY. 11 APPENDICES A FIGURES 13 B METHODS OF TEST 15 C LIST OF REFERENCED DOCUMENTS . 27 Accessed by UNIVERSITY O
16、F SOUTH AUSTRALIA on 10 Mar 2008 AS 46282005 4 Standards Australia .au STANDARDS AUSTRALIA Australian Standard Pressure and temperature limit devices for use with gas burners S E C T I O N 1 S C O P E A N D D E F I N I T I O N S 1.1 SCOPE These requirements apply to pressure and temperature limit de
17、vices intended to be used with gas or multi-fuel burners. Compliance with these requirements does not imply acceptability for use without supplemental tests in an intended application. A limit device incorporating electrical components shall comply with the requirements of the appropriate electrical
18、 authority. Requirements for mechanically operated over-pressure and under-pressure cut-off devices are published in AS 4632. 1.2 DEFINITIONS 1.2.1 Authority Means the authority having jurisdiction or such authority as delegated. (Technical Regulator). 1.2.2 Certified Assessed by a Certifying Body,
19、and having a certificate number to demonstrate compliance with a Standard. 1.2.3 Certifying body A body acceptable to the Technical Regulator that provides assurance of compliance of appliances and components with nominated standards or other accepted safety criteria. 1.2.4 Gas A combustible fuel ga
20、s which may be one of the following: 1.2.4.1 Natural gas (NG) A hydrocarbon gas, consisting mainly of methane. 1.2.4.2 Simulated natural gas (SNG) A gas comprising a mixture of LPG and air, in the approximate proportions of 55% gas and 45% air for commercial propane. 1.2.4.3 Town gas (TG) A gas manu
21、factured from coal or petroleum feedstocks. 1.2.4.4 Tempered liquefied petroleum gas (TLP) A gas comprising a mixture of LPG and air, in the approximate proportions of 27% gas and 73% air for commercial propane. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 5 AS 46282005 .au Standards Aus
22、tralia 1.2.4.5 Liquefied petroleum gas (LPG) A gas composed predominantly of any of the following hydrocarbons, or any combination of them in the vapour phase; propane, propene (propylene), butane, butene (butylene). 1.2.5 Limit device An automatic control responsive to changes in pressure or temper
23、ature and normally set beyond the operating range for limiting the operation of the controlled equipment. 1.2.6 Rated working pressure The maximum allowable inlet pressure specified by the manufacturer. 1.2.7 Technical regulator The Government appointed person, body or authority that has jurisdictio
24、n over gas safety legislation (or other entity authorized by that person, body or authority). Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 46282005 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 Continuity of satisfactory operat
25、ion Materials used in the construction shall be such that continuity of satisfactory operation can be expected during normal usage within the manufacturers specification. 2.1.2 Suitability of materials for conditions of use Materials and finishes, including dressings and lubricants, used in the cons
26、truction, shall be suitable for the conditions of use (e.g. corrosion, temperature, handling, etc.). 2.1.3 Materials in contact with gas Materials in contact with the gas, including lubricants, dressings and jointing compounds, shall be suitable for use with all gases. At the completion of testing i
27、n accordance with M.O.T. 2.1.3, the device shall satisfy the requirements of Clauses 3.1.3 and 3.5.1. 2.1.4 Melting point of materials The body of a limit device intending to contain gas shall be made of metallic materials with a melting point not less than 430C. 2.1.5 Parts in contact with water Al
28、l parts that are in contact with water shall have a corrosion resistance not inferior to alpha inhibited brass. (Refer to AS 1056.1.) 2.1.6 Brass parts Brass parts shall be resistant to season cracking when tested in accordance with AS 2136. 2.1.7 Component parts materials selected to appropriate St
29、andards Alloys used for component parts shall be selected from appropriate Australian Standards or their equivalent. 2.2 CONSTRUCTION 2.2.1 Continuity of satisfactory operation Construction shall ensure the continued safe operation of the unit during usage within the manufacturers specification. 2.2
30、.2 Castings and hot pressings All castings and hot pressings shall be clean and sound, free from laps, blow holes and pitting and all surfaces not machine finished shall be clean, smooth and free from sand. 2.2.3 Sealing of porous castings or cracks Porous castings or cracks in gas-carrying parts sh
31、all not be sealed other than by an accepted method for the impregnation of castings, e.g. vacuum impregnation. 2.2.4 Assembled device to be clean The assembled unit shall not contain dirt, casting sand, swarf or other foreign matter. There shall be no excess diaphragm dressing or jointing compound i
32、n the unit. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 7 AS 46282005 .au Standards Australia 2.2.5 Accidental displacement of parts Every part shall be secure against accidental displacement and shall be constructed to maintain a fixed relationship between essential parts under normal
33、and reasonable conditions of handling and usage so as to ensure continued compliance with this Standard. 2.2.6 Prevention of accidental shift after calibration Means provided for factory calibration shall be factory sealed to prevent accidental shifting after calibration. 2.2.7 Attachment of knobs,
34、handles, dials and pointers Knobs, handles, movable dials and pointers, where supplied, shall be securely attached to their spindles. 2.2.8 Springs Springs shall be resistant to corrosion. The ends of a helical spring shall be flat and in a plane perpendicular to the axis of the spring. The coils of
35、 a cylindrical helical spring shall not be able to overlap. 2.2.9 Securing of parts Adhesives shall not be used for securing parts together without additional mechanical fixing means, except for labels. 2.2.10 Sharp edges Constituent parts shall be free from sharp edges that may cause damage or inju
36、ry. 2.2.11 Holes for assembly or mounting Holes for screws, pins, etc., intended for the assembly of parts or for mounting shall not open into gasways and shall provide a minimum wall thickness of 1 mm from gasways. 2.2.12 Permanent sealing of non-functional holes Non-functional holes used for manuf
37、acture and which form a passage between gasways and the atmosphere shall be permanently sealed by mechanical means. 2.2.13 Self-tapping screws Self-tapping screws, other than those that form a fully swaged machine type thread, shall not be used to secure together the external joint of a gas-carrying
38、 component that may be removed in servicing. The application of thread-forming screws shall be limited to malleable materials and shall not result in deformation or cracking of the component. 2.2.14 Construction of parts not covered by this Standard The construction of parts not covered by this Stan
39、dard shall be in accordance with reasonable concepts of safety, substantiality and durability. The general assembly shall be of a neat and workmanlike character with all parts well fitted. 2.2.15 Tightening of a gland or any other adjustments The tightening of a gland or any other adjustment will no
40、t destroy the ability of the unit to meet this Standard. 2.3 DESIGN 2.3.1 Fail-safe type All safety functions shall be of a fail-safe type. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 AS 46282005 8 Standards Australia .au 2.3.2 Safety device cannot be overridden No means shall be incorp
41、orated to bypass, hold open or partly open any safety function when it should be closed. 2.3.3 Accessibility of integral parts Integral parts that may require adjustment shall be accessible for adjustment. 2.3.4 Adjusting devices Adjusting devices shall be arranged to prevent movement other than man
42、ual adjustment. 2.3.5 Locking device The tightening of a locking device shall not alter the setting. 2.3.6 Components requiring servicing Components requiring servicing during normal use shall be accessible and shall be manufactured so that parts cannot be incorrectly assembled. 2.3.7 Special tools
43、not required for servicing or replacement Special tools beyond those normally carried by service personnel shall not be required for field servicing or replacement. 2.3.8 Venting The venting of the atmospheric pressure chamber of a gas pressure-limiting device shall occur through a vent limiter or t
44、here shall be provision for connecting a vent line unless a flow limiter is provided in the gas pressure-sensing connection. Where a flow limiter or a vent limiter is fitted, the orifice shall have a maximum diameter of 0.4 mm for LP gases and 0.7 mm for all other gases. A vent limiter shall be so c
45、onstructed and located that it cannot easily become blocked and that a cleaning device inserted into the vent limiter cannot readily damage the diaphragm. 2.3.9 Protection of mechanism The mechanism of a limit device shall be protected by an enclosure to avoid damage to or interference with operatin
46、g parts. 2.3.10 Knobs and movable dials Knobs and movable dials shall be so designed as to avoid accidental change of setting in service. 2.3.11 Connections Except when the unit is supplied with special purpose fittings for a specific appliance, the connections shall be in accordance with an approve
47、d standard and, if threaded, shall be provided with spanner flats. 2.3.12 Pressure test points Pressure test points shall accept 6 mm bore tubing and the orifice shall be no greater than 0.7 mm diameter. 2.3.13 Connections suitable for rated working pressure Pressure-sensing line connection(s) shall
48、 be suitable for the rated working pressure of the limit device. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 10 Mar 2008 9 AS 46282005 .au Standards Australia 2.3.14 Secure mounting Provision shall be made for securely mounting a limit device in position. Bolts or screws used for mounting shall be
49、independent of those used for securing parts of the device to its frame or base. A threaded pipe connection shall be considered to meet this requirement. 2.3.15 Transparent covering A transparent covering for an observation opening, shall be secured in place so that it cannot be readily displaced in service and shall provide mechanical protection for the enclosed parts. 2.3.16