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the valve in an oil pipeline must be closed rapidly when a leak is detected but not so fast as to produce a large pressure

the valve in an oil pipeline must be closed rapidly when a leak is detected but not so fast as to produce a large pressure rise. a 1250 m long pipeline carries oil through a .5 m diameter steel pipe with expansion joints and a wall thickness of 2.5 cm. the normal discharge rate is 1.65 m3/s. determine the minimum valve closure time that would prevent a large pressure rise

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