scholarly journals Pump-stoppage-induced water hammer in a long-distance pipe: a case from the Yellow River in China

2018 ◽  
Vol 19 (1) ◽  
pp. 216-221
Author(s):  
Yipeng Zhang ◽  
Meiqing Liu ◽  
Zhiyong Liu ◽  
Yuanwei Wu ◽  
Jie Mei ◽  
...  
Keyword(s):  
Transient Flow ◽  
Yellow River ◽  
Flow Analysis ◽  
Water Hammer ◽  
Extreme Condition ◽  
System Component ◽  
Long Distance ◽  
Pump Failure ◽  
Transient Flow Analysis ◽  
Water Transmission

Abstract Pump stoppage can instantaneously increase the pressure within a pipeline, which is an extreme condition and poses a severe threat to the safety of long-distance water transmission projects. Reducing positive and negative pressures is essential to reducing this risk, improving operational efficiency, and avoiding system component fatigue. This study investigated the performance of a combination of dimensionless pump parameters and pipeline pressure in providing detailed information for designing protective equipment to mitigate water hammer effects, which are generated by sudden pump stoppage. The conditions of the method of characteristics were satisfied by conducting an overall transient flow analysis to estimate the potential of the increased pressure relevant to all types of operating schemes. Extreme pressure waves, produced by pump failure or rapid valve closure, can be prevented using efficient protective designs. The findings of this study can be instructive to alleviating the potential damage engendered by water hammer.

Transient flow analysis of integrated valve opening process

2017 ◽  
Vol 313 ◽  
pp. 296-305 ◽  
Author(s):  
Xinming Sun ◽  
Benke Qin ◽  
Hanliang Bo ◽  
Xingxing Xu
Keyword(s):  
Transient Flow ◽  
Flow Analysis ◽  
Valve Opening ◽  
Transient Flow Analysis ◽  
Opening Process

Steady and Transient Flow Analysis of a Magnetically Levitated Pediatric VAD: Time Varying Boundary Conditions

2013 ◽  
Vol 36 (10) ◽  
pp. 693-699 ◽  
Author(s):  
Amy L. Throckmorton ◽  
Sharjeel A. Tahir ◽  
Sydnee P. Lopes ◽  
Owen M. Rangus ◽  
Michael G. Sciolino
Keyword(s):  
Boundary Conditions ◽  
Transient Flow ◽  
Flow Analysis ◽  
Time Varying ◽  
Magnetically Levitated ◽  
Transient Flow Analysis

scholarly journals Transient flow analysis in a Roots blower: Experimental and numerical investigations

2019 ◽  
Vol 134 ◽  
pp. 106305 ◽  
Author(s):  
Gursharanjit Singh ◽  
Shuaihui Sun ◽  
Ahmed Kovacevic ◽  
Qianhui Li ◽  
Christoph Bruecker
Keyword(s):  
Transient Flow ◽  
Flow Analysis ◽  
Numerical Investigations ◽  
Transient Flow Analysis

scholarly journals Reducing the Effects of Water Hammer Phenomenon in Pipelines by Changing the Closing Rate of Line Break Valve (LBV)

2021 ◽  
Author(s):  
Mohammad Reza Boroomand ◽  
◽  
Nasim Safar Razavizadeh ◽  
Ahmad Eshghi ◽  
◽  
...  
Keyword(s):  
Transmission Line ◽  
Initial Conditions ◽  
Saline Water ◽  
Flow Analysis ◽  
Flow Simulation ◽  
Environmental Hazards ◽  
Water Hammer ◽  
Air Chamber ◽  
Water Transmission ◽  
Closing Rate

Line break valves in pipelines are using to prevent environmental hazards caused by the entry of the fluid into the surrounding. The operation of these valves leads to sudden changes in pressure and velocity, resulting in the occurrence of the water hammer phenomenon. The water hammer pressure will cause serious problems such as the destruction of pipelines and transmission line equipment and tools. Due to the salinity of water, when a fracture occurs, the amount of water that enters the surrounding is environmentally essential, so the use of several LBVs is vital. This paper investigated a water transmission line with a total length of 337 km that transfers saline water from Khoor Moosa to Azadegan plain. This study discussed the closing of the valve at different rates and the solution to reduce its destructive effects. WaterGEMS V8i software and Hammer V8i software are respectively using to perform a steady flow simulation and damping flow analysis for this phenomenon. The results obtained from the steady-state flow simulation is the initial conditions in the damping flow calculations. Then, by reducing the closing rate of the valve in 6 different scenarios, the volume of air chambers decreased. Finally, the results led to creating a linear relationship between the valve closing rate and the capacity of the air chamber. The optimal model for this rate depends on reducing the construction cost as well as the environmental hazards caused by discharged water.

scholarly journals Transient Pressure and Rate Decline Analysis for Horizontal Well in Stress-Sensitive Composite Reservoir

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Yu Huang ◽  
Xiaoping Li ◽  
Xiaohua Tan
Keyword(s):  
Horizontal Well ◽  
Transient Flow ◽  
Orthogonal Transformation ◽  
Flow Analysis ◽  
Analytic Solutions ◽  
Stress Sensitivity ◽  
Transient Pressure ◽  
Regular Perturbation ◽  
Transient Flow Analysis ◽  
Permeability Modulus

The existence of stress sensitivity effect made the percolation mechanism of low-permeability reservoirs significantly complex. Further, numerous reservoirs have composite stratum properties in actual development procedure. This paper based on the concept of permeability stress sensitivity presents an unsteady flow model for horizontal well taking both stress sensitivity and composite reservoir into account. Analytic solutions for the transient pressure and the rate decline behaviors are obtained by comprehensive utilization of regular perturbation method, Laplace transformation, orthogonal transformation, and Stehfest numerical inversion. The example analysis verifies that the proposed model is reliable and practical. Likewise, there is a discussion of the influence of permeability modulus and other relevant parameters on the transient pressure and the rate decline for horizontal well in stress-sensitive composite reservoir. The work of this paper improved the previous researches and provided a more accurate basis for transient flow analysis and formation evaluation of this typical reservoir.

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