4.2. Hydraulic grade line and Energy grade line

Try these first

1. 1.

   What does HGL stand for in fluid mechanics?

   Hint

   It contains pressure and elevation components.

2. 2.

   What is included in the Energy Grade Line?

   Hint

   Think of what energy aspects affect fluid motion.

3. 3.

   What does the Hydraulic Grade Line (HGL) represent?

   • Total energy of fluid
   • Potential energy of the fluid
   • Kinetic energy of fluid

   Hint

   Remember its components.

4. 4.

   True or False: The Energy Grade Line (EGL) incorporates only the potential energy.

   • True
   • False

   Hint

   Consider what is included in EGL.

5. 5.

   Given a water system with pressures at points A and B, derive the HGL and EGL equations for this system.

   Hint

   Integrate the terms appropriately and consider steady flow.

6. 6.

   A pipe has variable diameter and elevation changes, determine the optimal height maintenance required to prevent cavitation.

   Hint

   Evaluate pressure changes along with flow velocity changes across points.