Water flows in a new 30cm-diameter, 410 m-long welded steel pipe from O’Brien re

Question

Water flows in a new 30cm-diameter, 410 m-long welded steel pipe from O’Brien reservoir to the downstream harmony reservoir. The pipe is elevated at plum ridge, which is 150 m downstream form O’Brien reservoir. The water surface in harmony reservoir is 27 m below the O’Brien reservoir water surface. If the maximum allowable negative pressure head in the pipeline is -6.5m, determine the maximum allowable vertical deflection at plum ridge relative to the O’Brien reservoir surface. What change could be made to the pipeline design to increase this maximum deflection? Water flows in a new 30cm-diameter, 410 m-long welded steel pipe from O’Brien reservoir to the downstream harmony reservoir. The pipe is elevated at plum ridge, which is 150 m downstream form O’Brien reservoir. The water surface in harmony reservoir is 27 m below the O’Brien reservoir water surface. If the maximum allowable negative pressure head in the pipeline is -6.5m, determine the maximum allowable vertical deflection at plum ridge relative to the O’Brien reservoir surface. What change could be made to the pipeline design to increase this maximum deflection?

Explanation / Answer

Maximum allowable deflection at plum ridge to the O Brien reservoir surface.

Effective depth is 150 m

Vertical deflection criteria l/d = 150/0.3 =500 m

Increase Maximum deflection of pipeline design

Effective Depth Of plum ridge is 27 m

=l/d * 150 =500*27=13500 m

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