Plastic Pipes Conference Association # 2023 Lake Buena Vista
J. Lahoz
An investigation project was launched in 2020 to clarify the relationships between the processing conditions and the design lifetime of PVC-U 250 pipes. Ca/Zn stabilized pressure pipes were extruded with different processing temperatures and characterized by their DSC B-onset temperature and degree of gelation. Their long-term hydrostatic strength was predicted using the methods described in ISO 9080:2003. The desired outcome of this project was to set up a correlation between the extrusion temperature and the 97.5% Lower Prediction Level of the stress that a PVC-U pipe can withstand after 100 years (LPL100y).
The results of this study show that an extrusion temperature of 180ºC is high enough to achieve a class MRS250. A moderate increase (+5ºC or +10ºC) of the extrusion temperature leads to a smooth decrease in the slope of the regression curve at 20ºC and, therefore, to an increase of the predicted LPL100y values. Higher processing temperatures (≥195ºC) result in only marginal increases in the Lower Prediction Levels, with clear risk of material degradation during processing.
The increase of LPL100y allows the initial MRS250 classification to be extended up to 100+ years. The resulting benefit for the prescribers and designers of pressurized water supply networks is to design their networks for 100+ years by using of design stress and design coefficient values typically used for a design lifetime of 50 years.
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