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pro00040 - Water Hammer Problem Civil 252 1 In Fig 1 the...

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Unformatted text preview: Water Hammer Problem Civil 252 1 In Fig 1 the elasticity and dimensions of the pipe are such that the celerity of the pressure ways is 3200 fps. Suppose the pipe has a length of 2000 ft and a diameter of 4 ft. The flow rate is initially 30 cfs. Water is flowing. Find (a) the water-hammer pressure for instantaneous valve closure; (b) the approximate water-hammer pressure at the valve if it is closed in 4.0 s; (c) the water-hammer pressure at the valve if it is manipulated so that the flow rate drops almost instantly from 30 to 10 cfs; (d) the maximum water-hammer pressure at a point in the pipe 300 ft from the reservoir if a 1.0-s value closure reduces the flow rate from 10 cfs to zero. ( 29 fps A Q V 39 . 2 2 / 30 / 2 = = = π (a) psi ft lb V pc p p h . 103 / 14840 39 . 2 * 3200 * 94 . 1 2 = = = = (b) psi p p h h 2 . 32 103 * 4 / 25 . 1 . 4 / 3200 4000 = = ≈ ′ (c) For this case of partial closure , 592 . 1 2 / ) 30 10 ( ), ( 2 fps V V pc p p h- =- = ∆ ∆ = ∆ π ( 29 ( 29 ( 29 psi ft lb...
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This note was uploaded on 03/19/2012 for the course CIVL 000 taught by Professor Kk during the Spring '10 term at HKUST.

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pro00040 - Water Hammer Problem Civil 252 1 In Fig 1 the...

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