What is the role of the impeller in a fire pump?

• A. To store water for firefighting
• B. To increase the speed of water flow
• C. To filter debris from water
• D. To allow for manual operation

Answer: (B)

The role of the impeller in a fire pump is to increase the speed of water flow. The impeller, which is a rotating component within the pump, creates centrifugal force as it spins. This force draws water into the pump through the inlet and accelerates it outward through the discharge port, resulting in an increase in velocity and pressure.

This functionality is crucial for firefighting applications, as the increased pressure allows the pump to effectively deliver water over distances and to various elevations, ensuring that firefighters can combat fires efficiently. An understanding of the impeller’s function is essential for pumper drivers/operators, as it directly affects the performance and effectiveness of the pump during emergency situations.