Investigation of water hammer problems and potential solutions in pump discharge lines

Download

index.pdf

Date

2019

Author

Erdem, Recep Çağrı

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

291
views

111
downloads

Disturbance in boundary conditions of a hydraulic system could cause rapid change in flow velocity in confined pipe systems. Pressure wave leading to an event called water hammer may occur as a consequence of that disturbance. Water hammer could lead to catastrophic failures on the hydraulic systems. Thus, proper protection measures should be defined and installed in the system before it is put into operation. The aim of this study is to analyze a pumped discharge line and ensure its safe operation against water hammer. For this purpose, the pump discharge line is examined with a transient software called HAMMER, in which unsteady partial differential equations of the pipe flow are solved with a widely used Method of Characteristics (MOC). Pump trip (shut-down) scenarios are tested in the analyses. High pressures that could cause bursting of the pipe and low pressures which lead to cavitation are observed in unprotected version of the hydraulic system. Afterwards, air chambers, flywheels, one-way surge tank and air valve are operated in separate and combined form. Lastly, comparison of the results is done with and without protection devices.

Subject Keywords

Water-pipes., Water Hammer, Hydraulic Transient, Air Chamber, Air Valve, Surge Tank.

URI

http://etd.lib.metu.edu.tr/upload/12625193/index.pdf
https://hdl.handle.net/11511/44786

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Investigation of Water Hammer Problems in the Penstocks of Pumped-Storage Power Plants Dinçer, Ali Ersin; Bozkuş, Zafer (2014-10-25) Waterhammer is an undesirable event, caused by sudden flow changes in confined pipe systems. When it occurs, its consequences can be very costly and even sometimes deadly. In general, it may be encountered in the penstocks of hydropower plants, water transmission lines, water networks, etc. Therefore, the operation guidelines of the hydropower plants should be defined correctly. In the present study, waterhammer problems in wind-hydro hybrid plants are investigated. Time dependent flow conditions in the pen...
Investigation of Waterhammer Problems in Wind-Hydro Hybrid Power Plants DİNÇER, Ali Ersin; Bozkuş, Zafer (Springer Science and Business Media LLC, 2016-12-01) Sudden flow changes in confined pipe systems generate transient flow (waterhammer) conditions accompanied with very high or sometimes very low pressures traveling back and forth in the system. Depending on the magnitude of those pressures, pipe collapse or pipe bursting may take place at the weakest points of the system, resulting in costly damages as well as loss of human lives in some cases. In general, it may be encountered in the penstocks of hydropower plants, water transmission lines and water network...
Investigation of the Water Hammer Problems in Water-Wind Hybrid Systems Dincer, Ali Ersin; Bozkuş, Zafer (2015-07-01) Water hammer is an undesirable event, caused by sudden flow changes in confined pipe systems. When it occurs, its consequences can be very costly and even sometimes deadly. In general, it may be encountered in the penstocks of hydropower plants, water transmission lines, water networks, etc. Therefore, the operation guidelines of the hydropower plants should be defined correctly and if necessary, preventive measures should be considered. In the present study, water hammer problems in pumped-storage hydropow...
Investigation of interaction between pressure relief valve and turbines during a transient flow in hydropower plant Çetintaş, Mehmet Ali; Bozkuş, Zafer; Çelebioğlu, Kutay; Department of Civil Engineering (2022-2) The main goal of the present study is to investigate the effect of pressure relief valve (PRV) on the hydraulic transients generated by multiple turbine operations. To achieve this goal, a numerical model of KEPEZ-I Hydropower plant is constructed in the Bentley HAMMER software, which employs the Method of Characteristics (MoC) for computations. The MoC has been proven worldwide as a versatile and accurate tool for solving non-linear, hyperbolic, partial differential equations in space-time domain for hydra...
Numerical investigation of effective surge tank dimensions in hydropower plants under various hydraulic conditions Berberoğlu, Pınar; Bozkuş, Zafer; Department of Civil Engineering (2013) In water conveyance systems, sudden changes in the flow velocity cause a phenomenon called waterhammer associated with high pressure head changes. Unless a control device is used as a precaution, waterhammer may result in costly damages and even in some cases, loss of human lives. In light of this concept, different control devices that can protect the systems against waterhammer are introduced so that the great pressure differences are absorbed and the system is maintained undamaged. In this thesis, the ma...

Citation Formats

R. Ç. Erdem, “Investigation of water hammer problems and potential solutions in pump discharge lines,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.