Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion
Discussion Forum : Hydraulics and Fluid Mechanics - Section 2 (Q.No. 14)
14.
The hydraulic gradient line may be above or below the centre line of the pipe.
Discussion:
27 comments Page 1 of 3.
Kartik said:
5 years ago
True is the correct answer.
(2)
Jivan said:
5 years ago
In case of open channel, HGL coincides with water surface.
Joy said:
5 years ago
True is the right answer.
Vinay BEL said:
5 years ago
Yes, true is the correct answer.
Sawan gupta said:
6 years ago
The HGL should always lie above the profile. If it does not, the water may still flow but in sections where the profile lies above the gradient, a negative pressure ensues that can cause air or contaminants to enter the pipeline. Sections of the pipeline where negative pressures occur should be redesigned.
Vishal said:
6 years ago
HGL always above the centre line of pipe.
Pratik said:
6 years ago
Well HGL is static head + pressure head, so it can be below the center line of pipe, right?
Chandrootam said:
7 years ago
It may be vacuum pressure at a point inside the pipe, example -in case of flow through internal or external mouthpiece when flow head is more than 7.5m.
Vernon PE said:
7 years ago
It is True, due to existence of positive and negative pressure.
Pavankale said:
7 years ago
What if I select datum line such that it is half above the centre line and half belelow the centre line and pipe is inclined then HGL line may come below centre line?
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