What does the packing gland of a centrifugal pump indicate when it has a drip?

The presence of a drip from the packing gland of a centrifugal pump indicates that the packing is being lubricated by a small amount of liquid, usually water or a similar fluid. This drip serves a crucial function; it helps to prevent excessive heat buildup due to friction in the packing by providing lubrication, which is essential for the efficient and safe operation of the pump.

When the packing gland drips, it suggests that the packing is functioning properly in providing a seal while allowing a controlled amount of fluid to escape. In this context, a drip shows that the system is not entirely sealed, but it is a normal operational aspect of a well-functioning packing system in pumps. Therefore, this scenario aligns with the statement that there is water in the pump, as the drip is indicative of a controlled leakage necessary for proper lubrication.