To avoid vapourisation, pipe lines are laid over the ridge so that they are not more than ____
above the hydraulic gradient line.
-
A.
6.4 m
-
B.
2.4 m
-
C.
5 m
-
D.
10 m
Correct Answer:
A. 6.4 m
Explanation:
To prevent the formation of vapor pockets and the resulting air locks in a water supply system, pipe lines positioned over a ridge must be kept close to the hydraulic gradient line. Specifically, the peak of the pipeline should not exceed a vertical distance of 6.4 meters above the hydraulic gradient line. Maintaining this limit ensures that the pressure within the pipe does not drop low enough to cause dissolved gases to be released or the water to vaporize, which would otherwise impede the flow. Therefore, 6.4 m is the correct threshold.
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