Example The HGL and the EGL for a pipeline are shown in the figure a. Indicate w
ID: 1770707 • Letter: E
Question
Example The HGL and the EGL for a pipeline are shown in the figure a. Indicate which is the HGL and which is the EGL b. Are all pipes the same size? If not, which is the smallest? c. Is there any region in the pipes where the pressure is below atmospheric pressure? If so, where? d. Where is the point of maximum pressure in the system? e. Where is the point of minimum pressure in the system? f. What do you think is located at the end of the pipe at point E? g. Is the pressure in the air in the tank above or below atmospheric pressure? h. What do you think is located at point B? Air WaterExplanation / Answer
A) the solid line is the EGL (energy gradient line) and the dash line is the HGL (hydraulic gradient line). Remember EGL is always above the HGL in pipes system
B). AB Is the smallest pipe in the system.
C). The negative pressure exits in the system where elevation is higher than the HGL. So you can clearly see the point C is above the HGL. So the point c is the negative pressure point.
D).the point A is the maximum pressure point because the there is much difference in the elevation and HGL at that particular point.
E). The point C is the point of minimum pressure.
G).the pressure of the air is above the atmospheric pressyre because at the surface its atmodpheric pressure.
H. Point B is the point, where the difference betweem HGL and EGL is not much and is equal to v2/2g.
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