Abstract
This paper explored and compared the robustness of the inline and branching re-design techniques used to upgrade existing steel piping systems. These techniques are based on substituting an inline—or adding a ramified plastic short-section at the transient sensitive regions of the steel main pipe. The pressurized pipe flow solver was based on the water hammer model incorporating the Vitkovsky and Kelvin-Voigt formulations; besides, the Method of Characteristics was implemented for numerical computations. The robustness of the proposed protection techniques was tested with regard to a water-hammer event induced into a reservoir pipe valve system. Results demonstrated that both utilized techniques provided a useful tool to mitigate both water-hammer up-and down-surges. Additionally, the attenuation rates of hydraulic-head-rise and-drop were sensitive to the short-section material type and size. Moreover, the branching technique illustrated a marked enhancement compared with the inline one in terms of limitation of wave oscillation period spreading, while providing a surge attenuation rate comparable to that involved by the inline technique. Ultimately, the near-optimal values for the short-section diameter and length were estimated through sensitivity of hydraulic-head peak and crest to the short-section dimension.
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Trabelsi, M., Triki, A. (2020). Assessing the Inline and Branching Techniques in Mitigating Water-Hammer Surge Waves. In: Aifaoui, N., et al. Design and Modeling of Mechanical Systems - IV. CMSM 2019. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-27146-6_17
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DOI: https://doi.org/10.1007/978-3-030-27146-6_17
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