The leakage of seal water around the packing on a centrifugal pump serves primarily as which of the following?

• A. adhesive
• B. coolant
• C. corrosive inhibitor
• D. scale inhibitor

Answer: (B)

Seal water directed to the packing around a centrifugal pump’s shaft is there mainly to manage heat and wear. The friction where the shaft meets the packing generates a lot of heat, and the seal water absorbs that heat and carries it away, keeping the packing cooler and reducing wear on the packing and shaft. It also provides lubrication and helps flush away any debris that could damage the seal. It isn’t intended as an adhesive, a corrosive inhibitor, or a scale inhibitor, so those options don’t fit the primary purpose.