Leakage of seal water around the packing on a centrifugal pump is required because it acts as a

• A. Adhesive.
• B. Coolant.
• C. Lubricant
• D. Vapor barrier

Answer: (C)

Providing lubrication to the packing is the main purpose of seal water leaking around the packing in a centrifugal pump. The contact between the packing rings and the shaft creates friction, and the leaking water forms a lubricating film that reduces wear on both the packing and the shaft, helping prevent overheating and extending packing life. It also aids in cooling and flushing away debris, but lubrication is the primary role. Vapor barrier and adhesive concepts don’t fit this function, and while cooling occurs, the strongest, most accurate description of the leakage’s purpose is to act as a lubricant.