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IJSTR >> Volume 10 - Issue 5, May 2021 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Unsteady State Analysis In Low Head Pumping Stations

[Full Text]



Fahri Maho, Erind Maho



low head, penstock, pipe failure, pipeline, pumping station, rising main, transient, unsteady state, wastewater, water hammer, wave velocity.



Pipe failure in a rising main pipeline of a pumping station in a sensitive tourist area raised the need for a comprehensive water hammer analysis to find the causes and address protection measures. Being a low head pumping station, only a check valve has been installed to protect the system from water hammer effects. Calculations and computer modelling confirmed that immediately after an uncontrolled pump stop or power failure, the negative pressure wave starts propagating along the pipeline from the pumping station to the discharge manhole. The minimum pressure envelope intersects the rising main (pipeline), creating a vacuum on the pipeline in almost its full length. Without water hammer protection measures, the vacuum on the pipeline would be one of the main causes of the pipe failure. This study confirmed the need for water hammer analysis and consideration of protection measures even in rising mains of low head pumping stations to eliminate the consequences of such phenomenon.



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