What can result from overlubrication in a centrifugal pump?

Overlubrication in a centrifugal pump primarily leads to overheating of bearings. When excessive grease or oil is introduced into the bearings, it can create more friction than necessary, leading to an increase in operating temperature. The additional lubricant can also trap heat that would normally dissipate, resulting in further heating. Excess heat can degrade the lubricating oil or grease, weakening the lubricant and causing additional wear and tear on the bearings. This situation can potentially lead to premature bearing failure, which can disrupt the operation of the pump and lead to further complications.

In contrast, the other options do not directly relate to the consequences of overlubrication. Increased flow rate, reduced efficiency, and decreased capacity are more commonly associated with operational issues stemming from mechanical problems or inefficiencies within the pump system rather than specifically from the effects of too much lubrication.