The following information is intended to assist our customers with current standards and regulations. All information should be verified before being relied on.
Metal Backing Flanges for use with Polyethylene (PE) Pipe Flange Adaptors:
This document provides guidance realting to the geometric specification of metal backing flanges suitable for the use with PE flange adaptors in the sizes DN20 through to DN100 and flanges in accordance with Australian Standards.
“Where there is a need to join polyethylene pipe to pipe of another material or ancillary equipment such as valves and pumps then mechanical flanges may be used. They provide not only a means of transition but a fully end load resistant joint that can also be disassembled for maintenance purposes. As the thicknesses of these flanges differ, and therefore the pressure rating of the flange, care should be taken to ensure the pressure rating of the flange used is suitable for the system which it is being used on. Since polyethylene pipe systems are end load bearing, care must be taken where connection is made to pipe of another material, to prevent pullout of any non-end-load bearing joints.”
Electrofusion Jointing of PE Pipes and Fittings for Pressure Applications:
This document sets out the principal requirements for equipment, jointing procedures, maintenance, servicing and calibration of equipment, records and training for jointing by socket electrofusion, and saddle electrofusion. It is recommended to refer to the supplier or manufacturer of electrofusion fittings, in case the installation instructions specify different methods.
“Electrofusion fittings are currently available in the size range DN16 to DN1200. Larger sizes are under development. The key to consistently making satisfactory joints is to follow the jointing procedure with particular emphasis on pipe surface preparation, avoidance of contamination, machine calibration, as well as temperature monitoring and control. Pipes and fittings of different SDR can be joined together by the electrofusion process, eg DN250 SDR11 and SDR17 pipe can be successfully electrofused using a DN250 SDR17 fitting. Some manufacturers supply electrofusion fittings for thinner pipes, down to SDR33 whereas others limit the use of some saddle type fittings to SDR11 or thicker. These limitations are usually detailed on the fitting body or on the packaging. If in doubt, check with the supplier or manufacturer, as unsatisfactory joints are likely to occur if the fitting/pipe combination is incorrect. Pipes manufactured from different grades of PE materials- (for example PE80 and PE100) can be jointed successfully using electrofusion. Before welding it is important to confirm that all components have adequate nominal pressure rating for the operating conditions and the PE materials comply with AS/NZS 4131.”
Butt Fusion Jointing of PE Pipes and Fittings – Recommended Parameters:
This document is a guide to butt fusion of polyethylene (PE) Pipe using AS/NZS 4130 material as a basis.
“Butt welding involves the heating of two pipe ends to fusion temperature and then subsequently joining the two ends by the application of force. However, a successful butt weld requires the correct combination and sequence of the welding parameters time, temperature and pressure. Various proven butt fusion methods with minor differences have been in use in different countries for many years. ISO 21307 contains three distinct fusion methods described below for pipe and fittings. It is essential that the parameters specified for a given method are followed. Do not mix and match parameters from each method.”
Disclaimer: As always with technical information supplied by Acu-Tech Piping Systems, we supply it as a guide in the interest of better understanding of technical properties of our products. However, the application of such information may involve engineering judgements which cannot be correctly made without intimate knowledge of all the conditions pertaining to a specific installation. Acu-Tech Piping Systems does not act as a consultant in this regard; the responsibility for the use of any information or advice contained herein rests solely with the user. It should not be used in place of a professional engineer’s judgment or advice and it is not intended as installation instructions. See full disclaimer at www.acu-tech.com.au/privacy-policy.