What does the drip from the packing gland indicate in a centrifugal pump?

• A. Water in the pump
• B. Air in the system
• C. No leakage
• D. Packing gland is dry

Answer: (A)

A centrifugal pump uses a packing gland (stuffing box) around the shaft that is sealed to keep the water from leaking out while still allowing a small amount of leakage to lubricate and cool the packing. When you see a drip from the packing gland, it means water is escaping past the packing into the gland area and then out, which confirms there is water present in the pump and that the packing is doing its job without being perfectly airtight. This small, controlled leakage is normal.

This does not indicate air in the system, nor does it mean there is no leakage or that the packing gland is completely dry. If leakage were excessive or absent, that would suggest the packing needs adjustment or replacement.