Which type of horizontal pump features an impeller supported by the motor bearings?

The type of horizontal pump that features an impeller supported by the motor bearings is the close coupled pump. This design integrates the pump and motor into a single compact unit, meaning that the impeller is directly mounted on the motor shaft. This configuration simplifies the overall design and installation while reducing the amount of space required for the pump system.

The advantages of a close coupled pump include reduced wear on the bearings since there is no separate pump shaft, which can lead to improved efficiency and reliability. Moreover, the close coupled design often leads to lower costs in terms of both materials and maintenance since fewer components are involved compared to more complex pump arrangements.

In contrast, end-suction pumps typically utilize a shaft that extends from the motor to the impeller, which employs separate bearings. Vertical turbine pumps are designed primarily for deep well applications, using long shafts that are supported at multiple points. Split case pumps feature a design that allows for easy access to the impeller, but their impeller is also not supported directly by the motor bearings. Thus, the close coupled pump stands out for its distinctive support configuration for the impeller.