What problems may arise from tightening the gland in a pump?

Tightening the gland in a pump is a common practice to maintain the seal and prevent leaks; however, if tightened excessively, it can lead to several issues. The correct answer highlights excessive wear on the shaft or shaft sleeve as a significant problem.

When the gland is over-tightened, it increases the compression on the packing material surrounding the shaft. This added pressure can create additional friction between the packing and the shaft. Over time, this friction leads to increased heat generation, which can damage the shaft or the sleeve that protects the shaft. The wear can manifest as scratches or grooves, compromising the integrity of the pump and potentially leading to catastrophic failures.

Conversely, although tightening the gland might initially seem like a solution to leaking seals, it can create additional complications. Therefore, while managing the gland correctly is crucial, it is equally important to recognize the potential for excessive wear caused by over-tightening. Proper maintenance involves finding a balance that secures the seal without introducing undue stress on the mechanical components.