What do sealing devices prevent in pump operations?

Sealing devices in pump operations are primarily designed to prevent fluid leakage along the driving shaft. In a pump system, the driving shaft is essential for transferring power from the motor to the pump impeller, allowing the fluid to be moved efficiently. However, as the shaft rotates, there is a gap between the shaft and the pump casing, which can allow the process fluid to escape if not properly sealed.

Sealing devices, typically in the form of mechanical seals or packing, fill this gap and maintain a barrier that keeps the fluid contained within the pump. This is crucial not only for preventing environmental contamination but also for maintaining system efficiency and performance. When leakage occurs, it can lead to loss of fluid, decreased efficiency, and potential operational hazards.

The other options mentioned, while important in a broader context of pump operations, are not the primary function of sealing devices. For example, while excessive pressure buildup can certainly be a concern in a pump system, it is managed through design and pressure relief mechanisms rather than sealing devices. Similarly, while sealing can help reduce vibration and noise and limit corrosion by containing fluids, these are secondary benefits rather than the main role of sealing devices in pump operations.