Which statement correctly describes a volute centrifugal pump?

A volute centrifugal pump is characterized by its casing design, which is specifically engineered to enclose the outer edge of the impeller. This design is critical for the efficient conversion of kinetic energy generated by the rotating impeller into pressure energy. The volute shape itself acts as a pathway for the fluid, facilitating its movement from the impeller to the discharge pipe while minimizing turbulence and losses.

Understanding the role of the casing is essential, as it not only directs the flow but also helps to increase fluid velocity and pressure, making A the most accurate statement regarding volute centrifugal pumps. The other aspects of a volute centrifugal pump involve specific operating conditions and energy requirements, which do not align with the characteristics defined in the correct answer.