Which component is associated with a bellows seal?

• A. Type of impeller used in pumps
• B. Flexible metal bellows for sealing
• C. Fixed casing for centrifugal pumps
• D. Ball bearings for rotating shafts

Answer: (B)

The component associated with a bellows seal is indeed flexible metal bellows for sealing. Bellows seals are designed to provide a flexible and reliable method of sealing in rotating equipment. These seals are often used to prevent leaks in applications where conventional seals may not be suitable, such as high-pressure environments or those requiring a high degree of flexibility.

Flexible metal bellows can expand and contract, accommodating any movement in the connected components while maintaining a tight seal against fluids or gases. This resilience allows them to perform effectively in various conditions, including changes in temperature and pressure.

The other options refer to components that have distinct roles in rotating equipment. Impellers are critical for pump performance but do not provide sealing; fixed casings contain and support the pump structure rather than sealing; and ball bearings reduce friction in rotating shafts but are unrelated to sealing functions. Therefore, flexible metal bellows are specifically engineered for sealing applications, making them the correct answer in this context.