What is the term for multiple impellers stacked in a line shaft turbine?

The term used to describe multiple impellers stacked in a line shaft turbine is "Bowls." In this context, "bowls" refer to the individual components that house the impellers, each of which is responsible for elevating the water as it moves through the turbine system. Each bowl is designed to add energy to the fluid, and stacking multiple bowls allows for greater lift and efficiency in the water lifting process. This design is essential for applications requiring significant head, as it maximizes the hydraulic performance of the turbine by optimizing the arrangement of the impellers.

Understanding the terminology used in irrigation systems is critical, as it helps in the selection, installation, and maintenance of pumping systems. The other options do not accurately describe the configuration of multiple impellers; "stages" typically refers to the overall arrangement in multi-stage pumps but is not commonly used to specifically describe impellers in this context. "Rings" and "spheres" do not apply in the same manner either, as they do not define the structure found within line shaft turbines.