Massachusetts Wastewater Practice Exam

Which type of metering pump is considered most reliable?

1. Centrifugal

2. Diaphragm

3. Peristaltic

4. Progressive Cavity

The correct answer is: Peristaltic

The most reliable type of metering pump among the options listed is the peristaltic pump. This reliability stems from its method of operation, where the fluid is moved through a flexible tube that is squeezed and released by a series of rollers or shoes. This design minimizes wear and tear on the pump components since the fluid does not make direct contact with any mechanical parts of the pump, such as impellers or valves. As a result, peristaltic pumps can handle a wide variety of fluids, including those that are corrosive or viscous, and they are often utilized in applications where precise flow rates are critical. Additionally, since the fluid is contained entirely within the tubing, there is a reduced risk of contamination, making peristaltic pumps a favored choice for processes that involve sensitive substances. Their self-priming capability further adds to their reliability, allowing them to operate under a wide range of conditions without requiring complex setup. Alternative pump types, while useful in specific applications, may have limitations that affect their reliability. Centrifugal pumps rely on fluid dynamics and are therefore susceptible to cavitation when operated outside their intended range. Diaphragm pumps can introduce wear over time due to the mechanical components involved in their operation. Progressive cavity