AS NZS 2492-2007 Cross-linked polyethylene (PE-X) pipes for pressure applications.pdf

AS/NZS 2492:2007 Australian/New Zealand Standard Cross-linked polyethylene (PE-X) pipes for pressure applications AS/NZS 2492:2007 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 AS/NZS 2492:2007 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee PL-006, Polyolefin Pipe Systems. It was approved on behalf of the Council of Standards Australia on 8 June 2007 and on behalf of the Council of Standards New Zealand on 9 March 2007. This Standard was published on 31 July 2007. The following are represented on Committee PL-006: AUSTAP Certification Interests (Australia) CSIRO Manufacturing and Infrastructure Technology Energy Networks Association Engineers Australia Master Plumbers, Gasfitters and Drainlayers New Zealand New Zealand Water and Waste Association Plastics Industry Pipe Association of Australia Plastics New Zealand 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 are 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 Standards may also be withdrawn.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 Standard was purchased. 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This Standard was issued in draft form for comment as DR 05364. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 The Standard is downloaded from www.bzfxw.com Standard Sharing AS/NZS 2492:2007 Australian/New Zealand Standard Cross-linked polyethylene (PE-X) pipes for pressure applications COPYRIGHT © Standards Australia/Standards New Zealand 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. Jointly published by Standards Australia, GPO Box 476, Sydney, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020 ISBN 0 7337 8289 2 Originated as AS 24921981. Second edition 1994. Jointly revised and designated AS/NZS 2492:2007. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 AS/NZS 2492:2007 2 PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee PL-006, Polyolefin Pipe Systems, to supersede, in part, AS 24921994, Cross- linked polyethylene (PE-X) pipe for hot and cold water applications, which is withdrawn. The objective of this Standard is to provide a standard specification for manufacturers and purchasers of cross-linked polyethylene pipes to be used in pressure applications. The objective of this revision is to revise the Australian Standard and issue it as a joint Australian/New Zealand Standard. This revision extends the product applications to general pressure, including fuel gas, and includes sizes up to DN 1000. This Standard is based on the latest ISO documents for gas and water applications and, where appropriate, the principles of AS/NZS 4130 Polyethylene (PE) pipes for pressure applications and AS/NZS 4131, Polyethylene (PE) compounds for pressure pipes and fittings have been followed. One exception is the inclusion of the optional addition of pigment or carbon black masterbatch during extrusion. Appendix A incorporates increased BRT frequency related to use of the option. The overall service (design) coefficient of 1.25, taken from ISO 12162, Thermoplastics materials for pipes and fittings for pressure applicationsClassification and designation Overall service (design) coefficient, has been applied to establish the hydrostatic design stress. The requirements for resistance to slow crack growth and rapid crack propagation are intended to facilitate the use of PE-X pipes for fuel gas at pressures up to 16 bar and for general pressure applications without special granular bedding. The means for demonstrating compliance with this Standard (Appendix A) have been included for minimum sampling and testing frequency plans to include batch release tests, process verification tests and type tests requirements, to simplify and improve product quality verification. 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 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 be requirements of this Standard. Notes to text contain information and guidance. They are not an integral part of the Standard. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 The Standard is downloaded from www.bzfxw.com Standard Sharing 3 AS/NZS 2492:2007 CONTENTS Page FOREWORD4 SECTION 1 SCOPE AND GENERAL 1.1 SCOPE 5 1.2 MEANS FOR DEMONSTRATING COMPLIANCE5 1.3 APPLICATION.5 1.4 REFERENCED DOCUMENTS 5 1.5 DEFINITIONS 5 1.6 MARKING7 SECTION 2 MATERIALS 2.1 BASE MATERIAL9 2.2 TECHNICAL FILE .9 2.3 PERFORMANCE9 2.4 MATERIAL CLASSIFICATION9 2.5 REPROCESSABLE MATERIAL 11 2.6 SURFACE COATINGS AND STRIPES. 12 SECTION 3 PIPES 3.1 FREEDOM FROM DEFECTS 13 3.2 EFFECT ON FLUID OTHER THAN WATER AND FUEL GAS 13 3.3 EFFECT ON WATER. 13 3.4 COLOUR. 13 3.5 OPACITY 14 3.6 PRESSURE CLASSIFICATION. 14 3.7 DIMENSIONS. 14 3.8 MECHANICAL PROPERTIES. 14 3.9 PHYSICAL PROPERTIES 15 APPENDICES A MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD. 20 B OPERATING CONDITIONS FOR PE-X 80 PIPES USED FOR CONVEYANCE OF HOT AND COLD WATER WITHIN BUILDINGS 25 C REFERENCED DOCUMENTS 26 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 AS/NZS 2492:2007 4 FOREWORD This Standard describes pipes in terms of dimensional requirements, PE-X material, and PN rating. Appendix B tabulates operating parameters for PE-X pipes when used for the conveyance of hot and cold water within buildings. These parameters are taken from ISO 15875-2, Plastics piping systems for hot and cold water installationsCrosslinked polyethylene (PE-X), Part 2: Pipes, along with the pressure test requirements for PE-X 80. Other test requirements are taken from ISO 14531-1, Plastics pipes and fittingsCrosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuelsMetric series Specifications, Part 1: Pipes. In this Standard, there is a partial pressure limitation for liquefied petroleum gas (LPG). The aim of this limitation is to prevent the formation of aliphatic hydrocarbon liquids under normal service conditions and subsequent deleterious effects on the long-term performance of the pipe. At a partial pressure of 300 kPa absolute, the dewpoint for a typical propane LPG is below 0°C. The designer of a cross-linked polyethylene reticulation system should be aware that if service temperatures lower than this are likely to occur or if LPG containing significant quantities of butane gases are to be reticulated, the partial pressure limitation must be revised to avoid condensation of hydrocarbon liquids. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 The Standard is downloaded from www.bzfxw.com Standard Sharing 5 AS/NZS 2492:2007 COPYRIGHT STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND Australian/New Zealand Standard Cross-linked polyethylene (PE-X) pipes for pressure applications S E C T I O N 1 S C O P E A N D G E N E R A L 1.1 SCOPE This Standard specifies requirements for cross-linked polyethylene pipes for the conveyance of fluids under pressure. Such fluids include, but are not restricted to, water, wastewater, slurries, compressed air, and fuel gas. Fuel gas includes natural gas, liquefied petroleum gas (LPG) in the vapour phase and LPG/air mixtures. The partial pressure of the LPG is not to exceed 300 kPa absolute. Pipes intended for the transmission of fuel gas are hereinafter referred to as gas pipes and are not be operated at pressures above 1600 kPa gauge. 1.2 MEANS FOR DEMONSTRATING COMPLIANCE Compliance with this Standard shall be demonstrated in accordance with Appendix A. 1.3 APPLICATION This Standard does not apply to gas pipes for use with petroleum liquids, including liquid LPG and liquid pentane, or with manufactured or mixed gas distribution systems, which may contain more than 1% aromatics by volume, unless resistance to aromatic constituents has been demonstrated, as required in Clause 2.3. Pipes that do not contain carbon black in compliance with this Standard are not intended for extended exposure in direct sunlight. PE-X pipe is suitable for use at temperatures up to 100°C as described in Appendix B; however, continuous long-term operation should be between 50°C and +70°C. The test requirements specified in this Standard may be achieved by alternative test methods if such methods can be shown to provide equal or greater accuracy than those specified herein. In all cases of dispute, the methods specified in this Standard shall be considered the reference test methods. 1.4 REFERENCED DOCUMENTS The documents referred to in this Standard are listed in Appendix C: 1.5 DEFINITIONS For the purpose of this Standard, the definitions given in AS/NZS 3500.0 and those below apply. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 AS/NZS 2492:2007 6 COPYRIGHT 1.5.1 Liquefied petroleum gas (LPG) A hydrocarbon fluid composed predominantly of any of the following hydrocarbons or mixtures of all or any of them: propane (C3H8), propylene (C3H6), butane (C4H10) or butylenes (C4H8) (see Note 1). NOTES: 1Unless specifically stated otherwise, any reference to propane, butane, or similar means the commercial grade of that product. 2The characteristics of the various LP gases, either pure or commercial grades, together with methods for their determination, are given in the ALPGA publication Liquefied Petroleum GasSpecifications and Test Methods. 1.5.2 Nominal outside diameter (DN) Numerical designation of size, which is common to all components in a thermoplastics piping system other than flanges and components designated by thread size. NOTES: 1It is a convenient round number for reference purposes. 2The nominal outside diameter expressed in millimetres is the minimum mean outside diameter (dem.min) defined in Clause 1.5.4. 1.5.3 Mean outside diameter (dem) Value of the outer circumference of the pipe at any cross-section divided by , rounded up to the nearest 0.1 mm. NOTE: The value for taken to be 3.142. 1.5.4 Minimum mean outside diameter (dem.min) Minimum value of the mean outside diameter of the pipe specified for a given nominal outside diameter. 1.5.5 Maximum mean outside diameter (dem.max) Maximum value of the mean outside diameter of the pipe specified for a given nominal outside diameter. 1.5.6 Out-of-roundness (ovality) Difference between the measured maximum outside diameter and the measured minimum outside diameter in the same cross-sectional plane of the pipe. 1.5.7 Nominal wall thickness (en) Wall thickness, in millimetres, tabulated in ISO 4065, corresponding to the minimum wall thickness at any point (ey min). 1.5.8 Wall thickness at any point (ey) Measured wall thickness at any point around the circumference of the pipe. 1.5.9 Minimum wall thickness (ey min) Minimum permissible value of the wall thickness (ey) at any point around the circumference of the pipe. 1.5.10 Standard dimension ratio SDR Ratio of the nominal outside diameter of the pipe to its nominal wall thickness, SDR = dn/en. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 04 Jun 2008 The Standard is downloaded from www.bzfxw.com Standard Sharing 7 AS/NZS 2492:2007 COPYRIGHT 1.5.11 Cross-linked polyethylene (PE-X) Structures within the polyethylene polymer chains that are interconnected by chemical bonds to create a three-dimensional polymer network. NOTE: The properties of the three-dimensional structure ensure that it is not possible to melt or dissolve the polymer. The extent of cross-linking is related to the mass of insoluble material remaining following solvent extraction and can be determined by measurement of the gel content. 1.5.12 Base material Physical blend of non-cross-linked polyethylene(s) and additives formulated to facilitate conversion to PE-X during the production of pipe to meet the requirements of this Standard. 1.5.13 Lower confidence limit of the predicted hydrostatic strength (LPL) Quantity with the dimension of stress, which represents the 97.5% lower confidence limit of the predicted hydrostatic strength at a temperature and a time t in water. NOTE: It is denoted as LPL=, t, 0.975. 1.5.14 Long-term hydrostatic strength (LTHS) Quantity, with the dimensions of stress, which represents the predicted mean strength at a temperature ( ) and time (t) in water. 1.5.15 Minimum required strength (MRS) Value of LPL at a temperature of 20ºC and a time of 50 years (20°C, 50 years, 0.975), rounded down to the nearest lower value of the R10 or R20 series as specified in ISO 3 and ISO 497, depending on the value of LPL. 1.5.16 Nominal pressure (PN) A numerical designation used for reference purposes, related to the mechanical characteristics of the component of a piping system. For plastics piping systems conveying water it corresponds to the maximum continuous operating pressure in bar, which can be sustained with water at 20°C, based on the minimum design coefficient. 1.5.17 Overall service (design) coefficient (C) Overall coefficient, with a value greater than 1, that takes into consideration service conditions as well as properties of the components of a piping system other than those represented in LPL. NOTE: ISO 12162 specifies a minimum permissible service (design) coefficient of 1.25 for PE-X pipes. 1.6 MARKING Marking details shall be legibly printed or formed directly on the pipe. Marking of pipes shall not initiate cracks or other types of failure and, with normal storage, weathering and processing, and the permissible method of install