What affects the amount of pressure produced by an impeller?

The diameter of the impeller significantly affects the amount of pressure produced in a pump system. A larger diameter impeller can move a greater volume of fluid in a given amount of time, which translates to increased velocity and pressure. This is due to the fundamental principles of fluid dynamics, where a larger impeller diameter allows for heightened centrifugal force to be applied to the fluid, thereby enhancing the pressure produced.

In contrast, the other factors, while they may influence performance in certain ways, do not have the same direct impact on pressure generation as impeller diameter does. The operating temperature might affect fluid viscosity, which can alter flow characteristics but not pressure directly. The width of the pump casing primarily impacts the flow rate and not the pressure directly, and the length of the impeller blades can influence the efficiency of the pump but doesn't have the same direct correlation to pressure as diameter does. Thus, when considering the mechanics of pump design and operation, the diameter of the impeller stands out as a critical determinant of the pressure produced.