Which centrifugal pump casing type is most common in water utilities?

Which centrifugal pump casing type is most common in water utilities?

• A. Diffuser casing
• B. Volute casing
• C. End-suction casing
• D. Double-suction casing

Answer: (B)

Volute casings are the most common in water utilities because they offer a simple, robust design that smoothly converts the impeller’s velocity into pressure in a single, spiraling flow path. This straightforward geometry is easy to manufacture, maintain, and cost-effective, which fits the typical flows and pressures in distribution systems. Diffuser casings can improve efficiency by using multiple diffuser vanes to recover velocity head, but they are more complex and expensive, so they’re reserved for applications demanding higher efficiency or tighter head control. End-suction and double-suction describe inlet configurations or large-capacity setups and aren’t the standard representation of a typical utility pump’s casing.

Volute casings are the most common in water utilities because they offer a simple, robust design that smoothly converts the impeller’s velocity into pressure in a single, spiraling flow path. This straightforward geometry is easy to manufacture, maintain, and cost-effective, which fits the typical flows and pressures in distribution systems. Diffuser casings can improve efficiency by using multiple diffuser vanes to recover velocity head, but they are more complex and expensive, so they’re reserved for applications demanding higher efficiency or tighter head control. End-suction and double-suction describe inlet configurations or large-capacity setups and aren’t the standard representation of a typical utility pump’s casing.