What is the main purpose of a mechanical seal in a pump?

The main purpose of a mechanical seal in a pump is to control water leakage from the stuffing box. Mechanical seals are designed to prevent the fluid being pumped from leaking out along the shaft, which can be critical for maintaining system integrity and efficiency. By creating a tight seal around the shaft, mechanical seals help to minimize the amount of liquid that can escape, thus reducing the risk of operational inefficiencies and environmental hazards due to leaks.

In pumping systems, the stuffing box is an area where the pump shaft passes through the casing. Without a reliable sealing mechanism, leakage can occur, leading to loss of fluid, safety hazards, and increased maintenance costs. Mechanical seals are specifically engineered to withstand various pressures and temperatures, making them essential for reliable long-term operation of pumps in various applications.

The other choices refer to aspects that may be indirectly affected by the presence of a mechanical seal but do not represent its primary function. Enhancing pump efficiency, assisting in pump priming, and regulating pressure are important functions in the operation of a pump but are not directly related to the mechanical seal's role in preventing leakage.