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A platform for research: civil engineering, architecture and urbanism
Optimal valve closing law for improved water hammer control: a case from a water supply pipeline in Guelma, Algeria
Finding the most suitable closing law is essential to decrease the shock wave pressure caused by transient flow and minimize the potential damage to equipment. The closure of a valve can occur instantly, rapidly, or gradually, and the appropriate law can be convex, linear, or concave, depending on various factors. These factors include the pipe's characteristics (type, diameter, roughness, and length), the conveyed fluid (nature and temperature), and operating conditions (pressure and flow rate). Other factors that receive less attention, such as the duration of slow closure and the impact of soil load on the pipe, are also considered in this study. The main focus of this article is to investigate how the optimal law evolves based on the time it takes for a valve to gradually close, specifically in the case of a valve located at the end of an underground gravity supply pipe. The findings reveal that when the slow closure time (t) exceeds 0.50 times the return period (t4), the exponent of the optimal law becomes a damped periodic function. Each closure time corresponds to a unique optimal law, and as the valve closure time increases, the range of optimal laws becomes narrower. HIGHLIGHTS Each slow closing time corresponds to a single optimal convex law.; As the slow closing time increases, the range of optimal laws decreases and the appearance of maximum loads is delayed.; The evolution of the optimal pressure at the valve is governed by two models: exponential and linear.; The characteristic method with mixed scheme is used for the simulation of the transient flow of a long buried pipe.;
Optimal valve closing law for improved water hammer control: a case from a water supply pipeline in Guelma, Algeria
Finding the most suitable closing law is essential to decrease the shock wave pressure caused by transient flow and minimize the potential damage to equipment. The closure of a valve can occur instantly, rapidly, or gradually, and the appropriate law can be convex, linear, or concave, depending on various factors. These factors include the pipe's characteristics (type, diameter, roughness, and length), the conveyed fluid (nature and temperature), and operating conditions (pressure and flow rate). Other factors that receive less attention, such as the duration of slow closure and the impact of soil load on the pipe, are also considered in this study. The main focus of this article is to investigate how the optimal law evolves based on the time it takes for a valve to gradually close, specifically in the case of a valve located at the end of an underground gravity supply pipe. The findings reveal that when the slow closure time (t) exceeds 0.50 times the return period (t4), the exponent of the optimal law becomes a damped periodic function. Each closure time corresponds to a unique optimal law, and as the valve closure time increases, the range of optimal laws becomes narrower. HIGHLIGHTS Each slow closing time corresponds to a single optimal convex law.; As the slow closing time increases, the range of optimal laws decreases and the appearance of maximum loads is delayed.; The evolution of the optimal pressure at the valve is governed by two models: exponential and linear.; The characteristic method with mixed scheme is used for the simulation of the transient flow of a long buried pipe.;
Optimal valve closing law for improved water hammer control: a case from a water supply pipeline in Guelma, Algeria
Abdelouaheb Toumi (author) / Fateh Sekiou (author)
2024
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
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