Which statement about peristaltic pumps is true?

• A. They are large centrifugal pumps used for sludge
• B. They require no maintenance
• C. They are used for heating large volumes
• D. They are small positive displacement pumps commonly used for sampling and chemical addition

Answer: (D)

Peristaltic pumps are positive displacement devices that move fluid by temporarily compressing a flexible tube with rollers or a cam. This design delivers a reproducible volume with each rotation, which is why they’re great for precise sampling and chemical dosing in wastewater work. The fluid only contacts the inside of the tubing, so you can swap fluids easily and handle corrosive or viscous liquids without cross-contamination. They are typically small and suited for low to moderate flow rates, not for pumping large amounts of sludge like a centrifugal pump would, and they aren’t used for heating large volumes. Maintenance mainly involves replacing the tubing and checking rollers, so they’re not maintenance-free. For these reasons, the statement describing peristaltic pumps as small positive displacement pumps commonly used for sampling and chemical addition is the best fit.