Which device serves the same function as the packing?

The mechanical seal serves the same function as packing in that both are designed to prevent the leakage of fluids along the shaft of a pump or rotating equipment. Mechanical seals consist of two faces that are pressed together to create a seal, and they effectively maintain pressure and prevent leakage more efficiently than traditional packing materials. This results in reduced maintenance, less wear on components, and better performance for pumps and compressors.

In contrast, while packing glands and inline suction glands also serve sealing purposes, they rely on packing materials to create the seal, which can wear out over time and require regular replacement and adjustment. Lantern seals are a specific type of packing where a cavity allows for lubrication but still depends on packing material to function. Thus, the mechanical seal represents a more advanced solution that enhances reliability by minimizing leaks without the inherent drawbacks of packing materials.