Using a series of flash tank is referred to as what?

• A. Cascading
• B. Recirculation
• C. Filtration
• D. Condensation

Answer: (A)

Cascading describes a setup where the flow moves from one flash stage to the next in sequence, creating multiple stages of flashing. Each stage reduces pressure or changes temperature so part of the liquid flashes into vapor, and the vapor can feed into the next tank for further separation. This stepwise, chained arrangement is what the term cascading captures—the idea of a flow cascading through several units. Recirculation would mean looping the stream back to an earlier point, not moving forward through a chain. Filtration is about solids removal, and condensation is turning vapor back into liquid. So cascading is the best fit for a series of flash tanks.