Name the three factors used to classify pumps.

• A. material handled; pumping conditions; principle of operation
• B. size; horsepower; discharge
• C. location; suction head; discharge head
• D. noise level; weight; color

Answer: (A)

Pumps are categorized by three practical aspects: what they are moving, the conditions they operate under, and how they move the fluid.

Material handled describes the fluid itself—its chemical compatibility, viscosity, presence of solids, abrasiveness, and whether you’re pumping clean water, wastewater, slurry, or viscous fluids. This dictates what materials the pump and seals must be made of and how wear-resistant they need to be.

Pumping conditions cover the system requirements the pump must meet—flow rate, head (the pressure the pump must overcome), suction conditions, and overall system losses. These factors determine the appropriate pump size, capacity, and whether cavitation or suction issues are a concern in operation.

Principle of operation identifies the fundamental pump type, such as centrifugal (dynamic) or positive-displacement, and the specific mechanism (gear, vane, diaphragm, piston, etc.). This choice affects how the pump handles flow, pulsation, pressure variation, and what kinds of applications or fluids it’s best suited for.

That combination—what’s being pumped, the operating conditions, and the pump’s method of moving fluid—is why the first option is the best fit. The other options mix performance specs or system parameters (like size, horsepower, discharge, suction/discharge head, noise, weight, or color) that describe how the pump performs or looks rather than how it’s classified.