Protecting a Pumping Pipeline System from Low Pressure Transients by Using Air Pockets: A Case Study

Carmona-Paredes, Rafael Bernardo; Pozos‐Estrada, Oscar; Carmona-Paredes, Libia Georgina; Sánchez-Huerta, Alejandro; Rodal-Canales, Eduardo Antonio; Carmona-Paredes, Germán Jorge

doi:10.3390/w11091786

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…The determination of these points is, one lies on the system curve, the second on the efficiency curve, and the third one is the value of BHP that is computed from Eq. (10).…”

Section: Figure 2 Illustration Of Pump Performance and System Curvesmentioning

confidence: 99%

“…The study concluded that to understand the overall impact on the performance of a pumping system it is essential to study the feasibility of such measures that can optimize the data and improve the performance of the network based on a municipal water distribution system. Rafael et al [10] presented a study to examine the pipeline behavior before putting the system into operation. The case study is an existing water pipeline system consisting of five pumping stations each station is equipped with five pumps.…”

Section: Introductionmentioning

confidence: 99%

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Modeling the Impact of Pipeline Topography on the Performance of Pumping System

Al-Zaidi¹,

Makki²,

Al-Umar³

et al. 2023

MMEP

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The study consists of building a hydraulic model that can account for the effect of the slope of the pipeline on the pumping system performance. The model system is about a single perforated pipe with several different sizes opening holes equally distributed along the pipe and connected to the pump at the inlet, while the other end of the pipe is closed. The model was applied and implemented in several cases of pipe slope level, uphill, and downhill. Results have been shown for the case of equilibrium between the pump and the pipe system that the pressure head at the beginning of the pipe will increase when is in an uphill slope but inflow decreases because of the deficit in the pressure head and flowrate at the middle and end of the pipe and vice versa. A reasonable agreement between the model and previous studies was achieved for the model validation and accuracy. Also, the study showed that there is a large change in pressure head and flowrate along the pipe due to the change in elevation along the modeled pipe. The capacity of the system decreases in the case of an uphill slope and becomes lesser than the design capacity and decreases with increasing the slope value. More power is needed to adjust the differences between the actual and calculated system curve, and in sequences increase the cost of the pumping and decrease the efficiency of the pump. While in the case of a downhill slope, the capacity of the system is higher than the design capacity. In turn, less power is required to adjust the design operation point and low cost of the pumping, but there is a slight decrease in the efficiency of the pump. Also, the study concluded that the slope of the pipeline is a key issue in the design of the pumping pipeline system to reduce energy consumption and cost. This study can be considered a useful tool to perform the pumping system under various conditions of the hydraulic system.

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“…The determination of these points is, one lies on the system curve, the second on the efficiency curve, and the third one is the value of BHP that is computed from Eq. (10).…”

Section: Figure 2 Illustration Of Pump Performance and System Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling the Impact of Pipeline Topography on the Performance of Pumping System

Al-Zaidi¹,

Makki²,

Al-Umar³

et al. 2023

MMEP

View full text Add to dashboard Cite

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“…The hydraulic transient situation within the pressurized system (Figure 2(a)) was first simulated and analyzed without an elevated tank and then by integrating an elevated tank at diverse locations in the system. In all simulations, the surge analysis was performed due to the sudden failure of all operating pumps during the peak hour, as it is the worst scenario as reported by Tullis (1989) and Carmona-Paredes et al (2019). The tank was modeled according to the continuity equation, and its site was identified arbitrarily; close to the pumping plants (J 1 and J 3 ), in the middle (J 13 and J 17 ), and at the boundary of the network (J 21 and J 22 ).…”

Section: Hydraulic Transient Simulationsmentioning

confidence: 99%

Elevated tanks effect on transient pressures: case study

Darweesh

2021

Journal of Water, Sanitation and Hygiene for Development

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Elevated tanks are an integral part of the water supply networks. This paper highlights the effect of elevated tanks' location and size on the transient pressures resulting from the sudden failure of pumps. A comparison between the impact of elevated tanks and air vessels on the water hammer was also performed. The Bentley HAMMER model was first validated then applied to analyze the unsteady flow within an actual distribution network. The results display that the elevated tanks have a considerable effect on the surge pressures, where they improve the extreme pressures effectively at and around them, but they cannot fully protect the system from the water hammer risks, as there are still relatively large negative pressures at some distant junctions. Besides, as the tank capacity increases, the surge pressures increase slightly. In our case study, the best location of the elevated tank is at the network extremity and then at the pumping stations, since the minimum pressures improve by 67 and 54%, respectively. Although the present case study may differ from other supply systems, the obtained results can provide an indication of the elevated tanks' role in alleviating undesirable water hammer effects.

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