Study on water hammer protection of the siphon breaking structure in the water supply system

Lyu, Jiawen; Zhang, Jian; Wang, Tengyue

doi:10.2166/aqua.2022.162

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…In recent years, with the accelerated pace of urbanization, the scale of urban water supply networks has expanded rapidly. 1,2 Over time, some water supply pipelines, subject to factors like high water pressure and corrosion erosion, develop leaks, leading to substantial losses in water resources. [3][4][5][6] Hence, the repair of deteriorating and aging water supply pipelines becomes imperative.…”

Section: Introductionmentioning

confidence: 99%

The development of high‐strength, anticorrosive, and strongly adhesive polyaspartate polyurea coating suitable for pipeline spray repairs

Wang,

Du,

Fang

et al. 2024

J of Applied Polymer Sci

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This study synthesized polydimethylsiloxane (PDMS)‐modified polyaspartate polyurea (PPPU) with different ratios, considering the practical performance requirements of underground water supply pipeline spray repair materials. The successful synthesis of PPPU was confirmed using Fourier transform infrared spectrometer (FTIR) spectroscopy. The influence of the ratio of the two components and the content of ‐aminopropyl terminated polydimethylsiloxane (APT‐PDMS) on the drying time and tensile performance of PPPU coatings was evaluated. Based on this evaluation, a superior ratio for PPPU coatings was proposed. Subsequently, the bonding performance, hydrophobicity, and corrosion resistance of PPPU coatings at the superior ratio were tested. The results indicate that as the mass ratio of polyaspartic acid ester to hexamethylene diisocyanate trimer increases, both the drying time and tensile strength of the coating decrease. The addition of APT‐PDMS results in a decrease in the tensile strength of PPPU, but an increase in its elongation at break. The peak value of elongation at break is achieved when the APT‐PDMS content is 5%, making the PPPU2‐1‐5 coating the superior ratio for spray application on water supply pipelines. Through experiments, it was determined that the bonding strength of the PPPU2‐1‐5 coating with cement mortar under dry and humid conditions, static water contact angle (93.4°), and corrosion resistance performance are superior to those of the unmodified polyurea coating, demonstrating its application advantages. The conclusions drawn in this study provide a theoretical foundation for the practical engineering application of PPPU.

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Section: Introductionmentioning

confidence: 99%

The development of high‐strength, anticorrosive, and strongly adhesive polyaspartate polyurea coating suitable for pipeline spray repairs

Wang,

Du,

Fang

et al. 2024

J of Applied Polymer Sci

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“…Their experimental results showed that the maximum water hammer pressure generated in the viscoelastic pipe at all flow velocities was (20% at most) greater than the traditional value of Joukowsky's formula. Water supply systems were considered by Lyu et al [15], who showed that an appropriate water hammer protective scheme is very important in water supply systems. Water hammers can cause cavitation, as shown by Jansson et al [16] by means of a high speed camera.…”

Section: Introductionmentioning

confidence: 99%

Energy Intake Models for Intermittent Operation of Dead-End Microfiltration Filling Line

et al. 2022

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In filling lines equipped with membrane separation devices in the form of filters energy, consumption is only one of the important working parameters, the other being sustainable filter performance in terms of separation efficiency. As the filling line is typically equipped with a valve, intermittent operation of the filter is an important form of its use. Whereas the overall energy consumption of the filtration process is governed by the continuous operation mode, the intermittent mode, characterised by opening/closing of the valve, contributes most to problems of filter failure, i.e., the breakthrough of filtered particles through the membrane. A model for determination of the energy intake of a microfiltration membrane during the opening and closing of a valve is presented in this work. The model is based on computational analysis of the pressure wave signals recorded during the opening/closing of the valve using Fourier transform, and expressed in a nondimensional filter area specific energy intake form. The model is applied to a case of constant pressure dead-end microfiltration with three filter types: a single membrane filter, a stacked filter and a pleated filter with filtration surface areas ranging from 17.7 cm2 to 2000 cm2. Both clean filters, as well as partially clogged filter cases are taken into account. Second order polynomial models of the energy intake are developed and evaluated based on extensive analysis of the experimental data. The analysis of energy intake results show that the largest energy intake was observed for the clean filter case. When membrane fouling occurs at the constant flow rate values it leads to larger energy intake, however, due to a decreasing specific flow rate during fouling these values do not exceed the clean filter case.

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Negative pressure protection of water supply systems with multi-undulating terrain by one-way surge tanks

Zhao,

Yu,

Tang

et al. 2023

AQUA — Water Infrastructure, Ecosystems and Society

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The protection of negative pressures generated by the hydraulic transient process in the water supply system is crucial to safe and stable operation. In this study, a mathematical model of a pipeline hydraulic transient system with multi-undulating terrain was established based on the method of characteristics (MOC). The generation and development of water hammer negative pressures were analyzed, and double one-way surge tank protection schemes were proposed. It proved that the first surge tank should be located at the initial negative pressure point, and the second surge tank should be located at the second-highest point rather than the highest point. Additionally, compared with the theoretical minimum height, there was an optimization margin for the total surge tank height, which was reduced by 21% in this study. Meanwhile, the applicability of protection schemes and the influence of the one-way surge tank number on the total height were analyzed. The total height reduced with the increase of one-way surge tank number and tended to a minimum value. By comprehensively considering the engineering investment and negative pressure protection effect, the optimal surge tank number could be determined. This research represents an advance in negative pressure protection in multi-undulating terrain and provides support for further engineering studies.

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Study on water hammer protection of the siphon breaking structure in the water supply system

Cited by 3 publications

References 19 publications

The development of high‐strength, anticorrosive, and strongly adhesive polyaspartate polyurea coating suitable for pipeline spray repairs

The development of high‐strength, anticorrosive, and strongly adhesive polyaspartate polyurea coating suitable for pipeline spray repairs

Energy Intake Models for Intermittent Operation of Dead-End Microfiltration Filling Line

Negative pressure protection of water supply systems with multi-undulating terrain by one-way surge tanks

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