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1、AS 1056.31991 Australian Standard? Storage water heaters Part 3: Specific requirements for water heaters with composite shells Title allocated by Defence Cataloguing Authority: HEATER, WATER, ELECTRIC (Storage Type, Composite Shell) NSC 4410, 4520 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 14 Sep
2、2007 This Australian Standard was prepared by Committee EL/20, Electric Water Heating Appliances. It was approved on behalf of the Council of Standards Australia on 21 December 1990 and published on 28 March 1991. The following interests are represented on Committee EL/20; Australian Consumers Assoc
3、iation Australian Electrical and Electronic Manufacturers Association Australian Gas Association Confederation of Australian Industry Electricity Supply Association of Australia Engineering and Water Supply Department, S.A. Heat Exchange Water Heater Manufacturers Association Metal Trades Industry A
4、ssociation of Australia Additional interests participating in preparation of Standard: Material suppliers Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as
5、 necessary. It is important therefore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto. Full details of all Australian Standards and related publications will be found in the Standards Australia Catalogue of Publications; this information is s
6、upplemented each month by the magazine The Australian Standard, which subscribing members receive, and which gives details of new publications, new editions and amendments, and of withdrawn Standards. Suggestions for improvements to Australian Standards, addressed to the head office of Standards Aus
7、tralia, are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard should be made without delay in order that the matter may be investigated and appropriate action taken. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 14 Sep 2007 AS 1056.31991 Australian Standard? Storag
8、e water heaters Part 3: Specific requirements for water heaters with composite shells First published as part of AS C3161970. AS C3161970 revised and redesignated as AS 10561972. AS C3161970 withdrawn 1974. Second edition AS 10561977. AS 10561977 revised and redesignated in part as AS 1056.31985. Se
9、cond edition 1991. PUBLISHED BY STANDARDS AUSTRALIA (STANDARDS ASSOCIATION OF AUSTRALIA) 1 THE CRESCENT, HOMEBUSH, NSW 2140 ISBN 0 7262 6769 4 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 14 Sep 2007 PREFACE This Standard was prepared by the Standards Australia Committee on Electric Water Heating Ap
10、pliances to supersede the 1985 edition, to remove outdated references, to recognize changes to referenced Standards and to introduce a revised procedure for determining the solubility of vitreous enamel (see Appendix A, Paragraphs A2 and A7). This Standard is one of a series covering storage water h
11、eaters, the other Standards in the series being as follows: AS 1056Storage water heaters 1056.1Part 1: General requirements 1056.2Part 2: Specific requirements for water heaters with single shells 1056.4Part 4: Calculations of energy consumption CONTENTS Page 1 SCOPE3. . . . . . . . . . . . . . . .
12、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 APPLICATION 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 REFERENCED DOCUMENTS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SHE
13、LLS WITH METALLIC INSERTS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 BONDED VITREOUS ENAMELLED SHELLS 4. . . . . . . . . . . . . . . . . . . . . . . . 6 BONDED PLASTICSLINED SHELLS 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 THERMOSTAT SETTINGS7. . . . . . .
14、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DETERMINATION OF COMPLIANCE 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . APPENDICES AMETHOD FOR THE DETERMINATION OF THE SOLUBILITY OF VITREOUS ENAMEL LINING 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、 . . . . . . . BMETHOD FOR THE DETERMINATION OF THE RESISTANCE TO OXYGEN OF BONDED PLASTICS LININGS 11. . . . . . . . . . . . . . . . . . . . . . CMETHOD FOR THE DETERMINATION OF THE RESISTANCE TO THERMAL SHOCK OF BONDED PLASTICS LININGS13. . . . . . . . . . . . . . DMETHOD FOR THE DETERMINATION OF
16、THE RESISTANCE TO THERMAL CYCLING OF BONDED PLASTICSLINED SHELLS15. . . . . . ? Copyright STANDARDS AUSTRALIA Users of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where the Copyright Act allows and except where provided for below no pub
17、lications or software produced by Standards Australia may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from Standards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and inf
18、ormation on commercial software royalties should be directed to the head office of Standards Australia. Standards Australia will permit up to 10 percent of the technical content pages of a Standard to be copied for use exclusively inhouse by purchasers of the Standard without payment of a royalty or
19、 advice to Standards Australia. Standards Australia will also permit the inclusion of its copyright material in computer software programs for no royalty payment provided such programs are used exclusively inhouse by the creators of the programs. Care should be taken to ensure that material used is
20、from the current edition of the Standard and that it is updated whenever the Standard is amended or revised. The number and date of the Standard should therefore be clearly identified. The use of material in print form or in computer software programs to be used commercially, with or without payment
21、, or in commercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 14 Sep 2007 3AS 1056.31991 STANDARDS AUSTRALIA Australian Standard Storage water heaters Part 3: Specific requirements for w
22、ater heaters with composite shells 1 SCOPE This Standard specifies requirements for water heaters with composite shells made from steel and protected as follows: (a)With a metallic insert. (b) With a bonded vitreous enamel lining. (c)With bonded plastics lining. 2 APPLICATION The requirements of thi
23、s Standard are in addition to those in AS 1056.1. 3 REFERENCED DOCUMENTS The following Standards are referred to in this Standard: AS 1056Storage water heaters 1056.1Part 1:General requirements 1449Wrought alloy steelsStainless and heat-resisting steel plate, sheet and strip 1566Copper and copper al
24、loysRolled flat products 1627Metal finishingPreparation and pretreatment of surfaces 1627.4Part 4:Abrasive blast cleaning 1627.9Part 9:Pictorial surface preparation standards for painting steel surfaces 2812Welding, brazing and cutting of metalsGlossary of terms. 4 SHELLS WITH METALLIC INSERTS 4.1 N
25、on-ferrous metallic insert 4.1.1 Material The insert shall be made from one of the following materials complying with AS 1566: (a)Silicon bronze alloy A, Designation AS 1566/655. (b) 90/10 copper-nickel, Designation AS 1566/706. (c)Phosphorus deoxidized copper, high residual phosphorus, Designation
26、AS 1566/122. NOTE: Other materials may be considered by the Standards Australia Committee EL/20 for possible inclusion in this Standard on production of satisfactory evidence of long-term suitability. 4.1.2ThicknessWhen checked at 20 representative points on the walls and ends, the insert shall have
27、 a thickness of not less than 0.50 mm. 4.1.3 Conformity with steel shell The insert shall be in intimate contact with the steel shell over virtually its entire surface. 4.2 Steel shell The shell shall be made from a grade of steel that will consistently ensure satisfactory jointing with the insert.
28、4.3 Jointing 4.3.1 Welding of the shell The welds shall be of a quality not inferior to that produced by the submerged-arc process. The longitudinal seam shall be butt welded. Weld beads and edges against which the insert will bear shall be finished so that local stresses are not imposed upon the me
29、tallic insert. 4.3.2 Jointing of the insert Joints in the insert shall be either welded or brazed. The jointing shall be finished so that intimate contact with the steel is ensured. 4.4 Watertightness Where tested with water at the maximum working pressure, the insert shall not leak. Where a shell h
30、as openings for the expulsion of air from the interspace or for the detection of leaks, these openings shall be sealed at the conclusion of this test and while the shell is subjected to pressure. To provide access to the interspace, shells intended for type testing shall be fitted with at least thre
31、e sealable openings of 3 mm to 5 mm diameter (see Figure 1). COPYRIGHT Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 14 Sep 2007 AS 1056.319914 FIGURE 1OPENINGS IN CONTAINER 5 BONDED VITREOUS ENAMELLED SHELLS 5.1 Enamel lining material The enamel shall be of a grade suitable for the containment of po
32、table oxygenated water at the intended elevated temperature and complying with requirements for leaching of toxic elements (see Clause 5.5.1) and solubility of the lining (see Clause 5.5.2). 5.2 Steel shell 5.2.1 Material The shell shall be made from a grade of a steel that will consistently ensure
33、satisfactory lining with the proposed enamel. 5.2.2 Welding The welds shall be of a quality not inferior to that produced by the submerged-arc process. The longitudinal seam shall be butt welded. Welds other than the closing circumferential weld after enamelling (see Clause 5.4) shall be repaired, w
34、here necessary, before enamelling. 5.3 Application of enamel lining 5.3.1 Areas to be covered A lining of vitreous enamel shall be applied to all steel surfaces that will be exposed to water. Where sharp edges cannot be avoided, the extent of the burn-off of the enamel shall be not greater than 3 mm
35、 when measured from the sharp edge. 5.3.2 Thickness The thickness of the lining shall be as follows: (a)Minimum general thickness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150 m. (b) Minimum local thickness (not exceeding an aggregate area of 4000 mm
36、2) . . . . . . . . . . . . . . . . 120 m. (c)Maximum local thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .average thickness plus 400 m. (d) Minimum cover-coat thickness (for any two-coat process) . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 m. 5.3.3 Permissib
37、le imperfections The following imperfections shall be permitted: (a)Damage caused by cutting of a shell for examination of the lining. (b) Exposed areas of metal and ground coat (for two-coat Class Y enamel) individually not exceeding 3 mm in the largest dimension, and in aggregate not exceeding the
38、 following area: (i)For Class X vitreous enamel . . . . . . . . . . . . . . . . . . . . 350 mm2per square metre of surface area. (ii)For Class Y vitreous enamel . . . . . . . . . . . . . . . . . . . . 175 mm2per square metre of surface area. NOTE: In the calculation of aggregate area, the area of an
39、 individual exposed area is based upon its equivalent average diameter as judged with the aid of a low-powered microscope with calibrated eyepiece. (c)Areas of burn-off in accordance with the requirements of Clause 5.3.1. 5.4 Circumferential welding after enamelling 5.4.1Mating and alignment The mat
40、ing of pre-enamelled parts and the welding thereof shall not cause any fracture, removal or breakdown of the enamel lining that is exposed to freely circulating water. The parts shall be in enamel-to-enamel contact, except that, in the vicinity of the longitudinal seam, there may be a gap not exceed
41、ing 1.5 mm wide over a length not exceeding 50 mm (see Figure 2). 5.4.2 Welding The inner line of enamel-to-enamel contact shall be at least 3.0 mm from the root of the circumferential weld (see Figure 3). Bare steel or burned-off enamel shall not extend into the shell beyond the inner line of ename
42、l-to-enamel contact. COPYRIGHT Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 14 Sep 2007 5AS 1056.31991 5.4.3 Repairs to welding The closing circumferential weld may be repaired subject to the following conditions: (a)Welding shall be confined to lap fillet welds and to edge welds. (For illustrations
43、 of these welds see AS 2812, Figures A6(ah) and A6(am) respectively. (b) Repair welds shall be carried out by arc welding. (c)No individual repair weld shall exceed 50 mm in length and the total length of welding in any one shell shall be not more than 200 mm. DIMENSIONS IN MILLIMETRES FIGURE 2 PERM
44、ISSIBLE GAP IN ENAMEL-TO-ENAMEL CONTACT AT A CIRCUMFERENTIAL JOINT 5.5 Requirements for lined shells 5.5.1Toxic elements Compounds of lead, arsenic or antimony shall not be used in the production of enamel lining materials. 5.5.2 Solubility of the lining When determined in accordance with Appendix A
45、, the loss of mass of each specimen shall not exceed the following: (a)For Class X vitreous enamel. 0.03 mg per square millimetre of surface area. (b) For Class Y vitreous enamel. 0.015 mg per square millimetre of surface area. 5.5.3 Watertightness When tested with water at the maximum working press
46、ure, the enamelled shell shall not leak, and there shall be no crazing or spalling of the vitreous enamel lining. 6 BONDED PLASTICS-LINED SHELLS 6.1 Plastics lining material NOTES: 1.The following plastics lining material is considered suitable: A hot-water stabilized grade of polyamide 11, trade na
47、me Rilsan*type GSEC (not inferior to grade GSEC (72), in conjunction with a primer, trade name Rilprim*not inferior to type P3C, provided that (a)the material is coloured white and includes not more than 10 percent of dumped material that has been sieved to remove all material greater than 200 m; (b
48、)any such recycled material is thoroughly blended with the virgin material; and (c)the lined shell complies with the requirements of this clause. 2.Other plastics materials may be considered by the Standards Australia Committee EL/20 for possible inclusion in this Standard on production of satisfact
49、ory evidence of long-term suitability. 3.When other materials are available, the exclusion of trade names will be reconsidered by Committee EL/20. 6.1.1 Basic properties The plastics lining material, including the prime coat where appropriate, shall consist of a non-toxic material that is impervious to water and will not impart an odour or taste to the water. The lining material, both prime coat and final coat, shall comply with the requirements of an internationally recognized health authority for use in contact with potable water. *Products of ATOCHEM,
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