AS NZS 4766-2006 Polyethylene storage tanks for water and chemicals《水和化学制剂用聚乙烯储存罐》.pdf

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1、 AS/NZS 4766:2006 Australian/New Zealand Standard Polyethylene storage tanks for water and chemicals AS/NZS 4766:2006Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 2007AS/NZS 4766:2006 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee PL-04

2、6, Polyethylene Storage Tanks. It was approved on behalf of the Council of Standards Australia on 7 June 2006 and on behalf of the Council of Standards New Zealand on 16 June 2006. This Standard was published on 6 July 2006. The following are represented on Committee PL-046: Association of Rotationa

3、l Moulders (Australasia) Australian Industry Group Institute of Materials Engineering Australasia Water Services Association of Australia Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards a

4、re periodically 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 Standards may also be withdrawn.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 Standar

5、d was purchased. Detailed information about joint Australian/New Zealand Standards can be found by visiting the Standards Web Shop at .au or Standards New Zealand web site at www.standards.co.nz and looking up the relevant Standard in the on-line catalogue. Alternatively, both organizations publish

6、an annual printed Catalogue with full details of all current Standards. For more frequent listings or notification of revisions, amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options. For information about these services, users should contact thei

7、r respective national Standards organization. We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Please address your comments to the Chief Executive of either Standards Australia or Stan

8、dards New Zealand at the address shown on the back cover. Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 2007AS/NZS 4766:2006 Australian/New Zealand StandardPolyethylene storage tanks for water and chemicals Originated as AS/NZS 4766(Int):2002. Revised and redesignated as AS

9、/NZS 4766:2006. COPYRIGHT Standards Australia/Standards New Zealand All rights are reserved. No part of this work may be reproduced or copied in any form or byany means, electronic or mechanical, including photocopying, without the writtenpermission of the publisher. Jointly published by Standards A

10、ustralia, GPO Box 476, Sydney, NSW 2001 and StandardsNew Zealand, Private Bag 2439, Wellington 6020 ISBN 0 7337 7606 X Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 2007AS/NZS 4766:2006 2 PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zeal

11、and Committee PL-046, Polyethylene Storage Tanks. The design of a tank, its fittings and accessories should consider long-term fitness for purpose including service environment and decrease in physical properties of the material due to environmental effects. The terms normative and informative have

12、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 Notes to Tables and Figures are deemed to

13、 be requirements of this Standard. Notes to text are for information and guidance only. Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 20073 AS/NZS 4766:2006 CONTENTS Page 1 SCOPE AND LIMITATIONS 4 2 OBJECTIVE . 4 3 REFERENCED DOCUMENTS 5 4 DEFINITIONS 6 5 MATERIALS 6 6 DESI

14、GN 9 7 DIMENSIONS AND TOLERANCES 11 8 TANK CAPACITY. 11 9 FITTINGS. 11 10 ROTATIONAL MOULDING PROCESS EVALUATION. 12 11 WORKMANSHIP. 12 12 HANDLING, STORAGE AND PACKING 12 13 INSTALLATION 13 14 MARKING REQUIREMENTS 13 APPENDICES A MEANS OF DEMONSTRATING COMPLIANCE WITH THIS STANDARD 14 B THERMAL STA

15、BILITY TEST 19 C LIGHT TRANSMISSION TEST. 20 D LOW TEMPERATURE IMPACT TEST. 24 Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 2007AS/NZS 4766:2006 4 COPYRIGHT STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND Australian/New Zealand Standard Polyethylene storage tanks for water and c

16、hemicals 1 SCOPE AND LIMITATIONS 1.1 Scope This Standard specifies requirements for the design and manufacture of polyethylene storage tanks that are rotationally moulded in one-piece seamless construction. The tanks are for non-buried, vertical installation and capable of containing water, liquids

17、used in food and beverage manufacture and chemical solutions at atmospheric pressure. Separation of the roof (lid) from the body of the tank, after moulding, is permitted for transport purposes, provided that (a) the structural integrity of the tank is not adversely affected after the roof has been

18、refitted by the manufacturer or its nominated representative in the manner prescribed by the design engineer; and (b) the prevention of insect and/or vermin ingress is maintained. Methods for demonstrating compliance with this standard are given in Appendix A. 1.2 Limitations This Standard does not

19、provide design criteria for (a) liquid contents heated above their flash points; (b) liquid contents with service temperatures above (i) 40C; or (ii) the rated service temperature of the tank material. (c) superimposed pressure exceeding 0.25 m head of water, or 2.5 kPa above the maximum recommended

20、 fill level; and (d) superimposed mechanical forces, such as seismic forces, wind load or agitation. Where criteria in Items (a) to (d) apply, special design consideration shall be given. A tank shall have provision for overflow of contents. The tank material supplier shall be consulted where the an

21、ticipated service temperature of the liquid stored within the tank exceeds 40C. Tank design analysis and independent verification shall be performed by qualified professional engineer(s) as defined in Clause 4.3. Material data used as a basis for the design may include hydrostatic design stress data

22、 and/or creep and creep rupture data. This Standard does not apply to portable tanks for the transport of liquids. 2 OBJECTIVE The objective of this Standard is to (a) ensure secure storage of water and other liquids or chemicals (see Clause 1.1); (b) ensure performance and workmanship of the finish

23、ed tank is adequate for the intended application; Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 20075 AS/NZS 4766:2006 COPYRIGHT (c) ensure fittings are suitable for the intended application; and (d) specify design criteria and material selection to ensure the above. 3 REFE

24、RENCED DOCUMENTS The following documents are referred to in this Standard: AS 1145 Determination of tensile properties of plastics materials 1145.1 Part 1: General principles 1145.2 Part 2: Test conditions for moulding and extrusion plastics 1145.3 Part 3: Test conditions for films and sheets 1145.4

25、 Part 4: Test conditions for isotropic and orthotropic fibre-reinforced plastic composites 1145.5 Part 5: Test conditions for fibre-reinforced plastic composites 1722 Pipe threads of Whitworth form 1722.1 Part 1: Sealing pipe threads 1722.2 Part 2: Fastening pipe threads 2070 Plastics materials for

26、food contact use 2129 Flanges for pipes, valves and fittings 3688 Water supplyMetallic fittings and end connectors 4087 Metallic flanges for waterworks purposes AS/NZS 4020 Products for use in contact with drinking water HB 18 Conformity assessment HB 18.28 Guide 28Guidance on a third-party certific

27、ation system for products ISO 527 PlasticsDetermination of tensile properties 4892 PlasticsMethods of exposure to laboratory light sources 4892-2 Part 2: Xenon-arc sources 6964 Polyolefin pipes and fittingsDetermination of carbon black content by calcination and pyrolysisTest method and basic specif

28、ication ASTM D543 Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents D638 Standard Test Method for Tensile Properties of Plastics D1238 Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer D1693 Standard Test Method for Environmental Stre

29、ss-Cracking of Ethylene Plastics D2565 Standard Practice for Xenon Arc Exposure of Plastics Intended for Outdoor Applications D2837 Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials D3849 Standard Test Method for Carbon Black-Morphological Characterization

30、of Carbon Black Using Electron Microscopy D4703 Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 2007AS/NZS 4766:2006 6 COPYRIGHT 4 DEFINITIONS For the purpose of this Sta

31、ndard the definitions given below apply. 4.1 Polyethylene base resin A polyethylene base resin is an unpigmented virgin polyethylene polymer as supplied by the polyethylene producer. It may be in UV stabilized or non-UV stabilized form. 4.2 Polyethylene compound A polyethylene compound is a hot melt

32、 mixed blend of virgin polyethylene polymer, additives and pigments as required. 4.3 Qualified professional engineer An accredited structural engineer who is experienced in the design of structural products/applications utilizing polyolefin plastic materials and computerized finite element analysis

33、(FEA) programs, and has either chartered membership of The Institution of Engineers Australia or registration on the National Professional Engineers Register or equivalent organization in Australia or New Zealand. 4.4 Service (design) factor A de-rating value that takes into consideration reasonable

34、 material and process variation that is applied to long term resin data to provide a design safety margin. 4.5 Service temperature The maximum expected temperature of the contents of the tank or ambient temperature, whichever is the greater. 5 MATERIALS 5.1 Compounds Compounds shall be manufactured

35、from virgin polyethylene base resins containing additives and pigments, as required. 5.2 Re-use of material Reground, recycled or reprocessed materials shall not be used. 5.3 Melt flow index (MFI) When determined in accordance with ASTM D1238, the melt flow index of the polyethylene compound shall n

36、ot deviate by more than 20% from the value nominated by the compound manufacturer. NOTE: An equivalent ISO Standard for MFI determination may be used. 5.4 Thermal stability of base resin Polyethylene base resin used in compounds for tanks shall contain anti-oxidants, either singly or in combination,

37、 such that, when determined in accordance with Appendix B, the percentage melt index change shall be not more than 20% of the base resin value. 5.5 Carbon black for UV stability When determined in accordance with ISO 6964, polyethylene compounds containing carbon black to provide UV stability shall

38、contain 2.25 0.25% by mass of carbon black. When determined in accordance with ASTM D3849 or an equivalent ISO Standard, the average particle size of carbon black shall be less than 25 mm. Polyethylene compounds containing carbon black shall comply with the food contact requirements of AS 2070. Acce

39、ssed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 23 Aug 20077 AS/NZS 4766:2006 COPYRIGHT 5.6 UV resistance The requirements of this Clause shall apply to base resins where base resins are UV stabilized. Where UV stabilizers are added at the final compounding stage, this Clause shall appl

40、y to natural (unpigmented) powders. All UV testing shall be performed on natural (non-pigmented) base resin material to establish a minimum performance level for the material being tested. When tested in accordance with ASTM D2565, the polyethylene compound for tanks, fusion-bonded fittings and weld

41、ing rods shall contain UV stabilizers such that the natural (non-pigmented) compound will retain 50% tensile elongation after 8000 h of exposure in a Xenon-Arc weatherometer. Alternatively, UV testing in accordance with ISO 4892-2 may be conducted. When testing in accordance with ISO 4892-2, the tes

42、ting authority shall provide certified evidence to demonstrate that the amount of exposure hours in accordance with ISO 4892-2 is equivalent (or higher) in total energy output, to the total energy output of 8 000 hrs exposure in accordance with ATSM D2565. 5.7 Dispersion of additives and pigments 5.

43、7.1 General Compounded powders for rotational moulding that exhibit a uniform colour distribution after the master-batch has been compounded into the polymer will also exhibit uniform distribution of all other additives including UV light stabilizers that have been compounded into the master-batch s

44、imultaneously with the pigments. The addition of UV light stabilizer additives only, via master-batch into a non-UV stabilized base resin is not permitted. A sample for visual inspection of between 0.51 mm in thickness and a minimum of 40 mm diameter shall be rotational or compression moulded, or me

45、lted down from production powder to provide a sample sufficiently large to allow inspection under a light source. Colour shall be even through the specimen, without any evidence of agglomeration, blotching or other visual evidence of uneven dispersion. 5.7.2 Non-UV stabilized base resins For non-UV

46、stabilized base resins, anti-oxidants, ultraviolet light stabilizers and pigments, including carbon black, shall be evenly dispersed in the compound. The compounded resin shall be tested for uniformity of dispersion of additive via visual inspection of a specimen manufactured in accordance with Clau

47、se 5.7.1. Anti-oxidants, pigments and ultraviolet stabilizers shall be pre-compounded with a small percentage of a suitable polyethylene resin into a masterbatch, before this masterbatch is compounded with the (non-UV stabilized) base resin at the prescribed ratio/percentages to ensure the final com

48、pound complies with Section 5 of this Standard. Pigment content, other than carbon black, shall not exceed 2% of the total mass. 5.7.3 Pigmented UV-stabilized base resins For UV-stabilized base resins, the compounded resin shall be tested for uniformity of dispersion of the pigments by visual inspec

49、tion of a specimen manufactured in accordance with Clause 5.7.1. Anti-oxidants and pigments shall be pre-compounded with a small percentage of a suitable polyethylene base resin, into a masterbatch compound, before this masterbatch is compounded with the UV stabilized base resin at the prescribed ratio/percentages to ensure the final compound complies with Section 5 of this Standard. Pigment content, other than carbon black, shall not exceed 2% of the total mass. Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SU