In a Centrifugal Pump, the primary function of the Volute Casing is to
- AIncrease the velocity of the liquid coming out of the impeller.
- BGradually convert the kinetic energy of the liquid into pressure energy.Correct
- CReduce the overall weight of the pump assembly.
- DPrevent the entry of air into the suction pipe.
Solution
Concept
Volute Casing Function in Centrifugal Pumps
Formula
N/A
Step-by-step solution
1. Identify the primary function of the Volute Casing in a Centrifugal Pump. 2. Recall that its gradually expanding cross-sectional area converts the kinetic energy of the fluid into pressure energy. 3. Select Option B as the correct choice.
Explanation
The volute casing surrounds the impeller with a gradually expanding area. As water leaves the spinning impeller and flows through this expanding casing, its speed slows down, which converts its kinetic energy into pressure energy to help lift the water.
Shortcut
To easily remember the function of a Volute Casing, use the memory rule "Volute = Velocity to Pressure": - Impeller gives Velocity: Converts mechanical energy into High Kinetic Energy (Velocity). - Volute converts to Pressure: The expanding area slows down Velocity to build up High Pressure Energy.
Common mistake
A common mistake is selecting option A by confusing the role of the impeller with that of the volute casing. Students often incorrectly assume the casing increases fluid velocity, whereas the impeller increases velocity and the volute casing gradually reduces velocity to convert kinetic energy into pressure energy.
Correct answer: B) Gradually convert the kinetic energy of the liquid into pressure energy.