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Impacts des stratégies d'exploitation de réseaux intérieurs sur la durabilité de canalisations d'eau chaude

Abstract : Hot water quality control inside buildings is assured by thermal or/and chemical disinfection treatments. These disinfection treatments could have an impact on the material degradation. The influence of the addition of sodium hypochlorite and the increase in temperature on the degradation of copper, galvanized steel, PERT/Al/PERT and cPVC pipes was studied. Accelerated ageing tests were conducted under static and dynamic conditions. To carry out the tests under dynamic conditions a scale 1 pilot was designed and built.The chemistry of sodium hypochlorite solutions at temperatures higher than 50°C is complex. Therefore, the species repartition as a function of pH and the decomposition kinetic of sodium hypochlorite solutions had also been studied. This study revealed that, at a given pH, an increase in temperature from 50°C to 70°C produce a significant decrease in concentration of hypochlorous acid. In addition, the decomposition of sodium hypochlorite in chlorates is accelerated by the presence of copper. The chlorates concentration can become significant at 50°C in presence of copper.The results of the ageing test performed on pipes revealed that the addition of sodium hypochlorite increase the degradation rate of copper, galvanized steel and PERT/Al/PERT. However, the degradation rate of cPVC does not seem to be affected by the addition of sodium hypochlorite. An increase in temperature from 50°C to 70°C slightly accelerated degradation of PERT /Al/PERT and cPVC. Concerning copper, at 70°C corrosion is uniform while at 50°C corrosion is by pitting.The conclusions of this study can be useful for the design and the maintenance of hot water systems.
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Jaime Castillo Montes. Impacts des stratégies d'exploitation de réseaux intérieurs sur la durabilité de canalisations d'eau chaude. Autre [cond-mat.other]. Université de La Rochelle, 2011. Français. ⟨NNT : 2011LAROS345⟩. ⟨tel-00730705⟩

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