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An oil company wishes to construct a pressurised pipeline of 300 mm diameter to convey freshwater,...

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Civil Engineering

An oil company wishes to construct a pressurised pipeline of 300mm diameter to convey freshwater, of bulk modulus 2.10x109 N/m2from a desalination plant to a refinery at a rate of 350 l/s andwith a pipe period of 4 seconds. Calculate the correspondingtheoretical surge pressure induced within the pipeline by thecomplete closure of an on-line valve (located at the end of thepipe) in 8 seconds. The valve generates non-uniform retardation oftype R = At0.65. The steel pipe has 5 mm thick walls, a Young’smodulus of 2.1x1011 N/m2 and Poisson’s ratio of 0.28. Calculate thepressure transients at the valve in the pipeline, for the first 12seconds after the valve starts to close. Assume that pipe islongitudinally restrained.

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