HGL and EGL.pptxHGL and EGL.pptxHGL and EGL.pptx

HGL and EGL.pptx

1. Energy Grade Line

A line that represents the elevation
of energy head (in feet or meters) of water
flowing in a pipe or channel.

The, ¿Line
hydraulic

2. Energy Grade Line

and can be expressed as:
EL=H=p/y+0/2g+h=constant

along a streamline
where

3. Energy Grade Line

+ For a fluid flow without any losses due
to friction (major losses) or components
(minor losses) - the energy line would
be at a constant level. In a practical
world the energy

the flow due

4. Energy Grade Line

+ A turbine in the flow reduces the
energy line and a pump or fan in the
line increases the energy line.

5. Hydraulic Grade Line

The Hydraulic Grade Line is a line representing the
total head

available to the fluid - minus the velocity head and
can be expressed as:

HGL=p/y+

ine (m)

|

7. va EGLAnd HGL

| In case the cross section is constant
the flow steady, discharge re:

velocity. Therefore, velocit

In that case, HGL will ah

int and also so

ins the same as well.

8. Applications of EGL and HGL in civil engg
+ APPLICATION OF HYDRAULIC GRADE LINE=

+ 1)The hydraulic grade line indicate the pressure
along the pipe

+ 2)The vertical distance
hydraulic edil hi y

ic grade line is the measure of

9. Applications of Energy Grade line in
civil engg

* 4)Change in elevation of the hydraulic
grade line is due to change in velocity
and diameter

10. Applications Cont:

* 6) The hydraulic grade line is a straight
line only if the pipe is straight and of
uniform diameter

+ 7) Energy grade li
which the