Plastic Pipes Conference Association # 2023 Lake Buena Vista
Giorgio Tabanelli
In plastic pipes for the distribution of pressurized water, the jointing technique using a Rieber-type socket is mainly used for PVC-U pipes. In such a socket, the gasket is integral part of the socket wall, and is no longer removable or even replaceable. On the other hand, in Molecularly Oriented Polyvinyl Chloride (PVCO) pipes, it is customary to add a removable and replaceable gasket to the socket joint, after the socket is formed. Riebertype sockets, despite their known operational advantages, are not used in PVCO pipes, essentially due to the difficulty to implement a heated Rieber socket forming process in the available industrial socketing machines for PVCO pipes. The Rieber socketing process for PVCO pipes should comply with fundamental requirements such as: adhesion of the gasket to the socket wall, preservation of the structural integrity of the gasket during the socketing process, repeatability of the socketing process, increase in the orientation factor of the PVCO material in the socket wall, and a guarantee for a socket shape and dimensions that are suitable for the functionality of the joint.
Recently, a new thermoforming process has been developed that allows a Rieber socketing of PVCO pipes for the distribution of pressurized water, meeting all these requirements. The procedure is applicable to all PVCO pipes, whatever the operating pressure class and orientation level. Specifically, it is applicable to ISO 16422 piping systems for pipes with nominal diameters from DN/OD 63 mm up to DN/OD 630 mm and to ANSI/AWWA C909 piping systems for pipes with nominal diameters from DN/OD 4” up to DN/ OD 24”. The procedure can be applied both to PVCO pipes oriented off-line by inflation in a separate chamber and to PVCO pipes oriented in-line directly on the extrusion line. The heated Rieber socket forming process considers the specific physical phenomena occurring in a PVCO pipe and the sealing gasket, which are considerably different from those found in a PVC-U pipe. Controlling these phenomena required the development of unconventional but effective technological solutions. This paper describes a Rieber socketing technology for PVCO pipes, with specific reference to innovative process solutions to control the thermo-mechanical phenomena specific to the hot forming of a Rieber socket in a PVCO pipe, as well as the analysis of the results of the experimental validation of this technology.
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