Which assembly holds the lantern ring and packing?

The stuffing box is vital in various mechanical systems, particularly in pumping applications, as it is responsible for containing the packing material that prevents fluid leakage along the shaft. Within the stuffing box, the lantern ring acts as a support that holds the packing in place, facilitating the surrounding fluid to lubricate the packing and shaft.

The stuffing box is designed to accommodate the packing material, typically made up of fibers or other sealing compounds, which compresses against the shaft to create a seal. The lantern ring, specifically, allows for fluid to enter the packing area, which can help reduce friction and wear on the shaft, extending the life of both the packing and the equipment.

Other assemblies mentioned do not serve this specific function. For instance, the shaft assembly focuses mainly on the rotational component, while the casing ring assembly typically refers to the outer structure that supports other elements. The packing gland box may also play a role in this context but does not directly hold the lantern ring and packing as effectively as the stuffing box does. Therefore, the stuffing box is recognized for its critical role in maintaining the integrity of the seal around the shaft, making it the correct choice.