An impeller in a pump primarily functions to ______.

An impeller in a pump primarily functions to ______.

• A. Builds pressure
• B. Moves volume
• C. Filters water
• D. Stores energy

Answer: (A)

The impeller’s job is to add energy to the fluid, and in doing so it raises the fluid’s pressure (head) so water can be pushed through the distribution system. As the impeller spins, it throws water outward, increasing its velocity, and this energy is converted into higher pressure in the pump discharge. That pressure is what overcomes friction and elevation differences downstream to deliver water to users. Filtering water or storing energy are not functions of the impeller itself; filtration is done by filters, and energy is stored in the water as head, not in the impeller.

The impeller’s job is to add energy to the fluid, and in doing so it raises the fluid’s pressure (head) so water can be pushed through the distribution system. As the impeller spins, it throws water outward, increasing its velocity, and this energy is converted into higher pressure in the pump discharge. That pressure is what overcomes friction and elevation differences downstream to deliver water to users. Filtering water or storing energy are not functions of the impeller itself; filtration is done by filters, and energy is stored in the water as head, not in the impeller.