Stuffing boxes compared to mechanical seals are known for what characteristic?

Stuffing boxes are known for allowing some leakage as they rely on packing material that compresses against a rotating shaft to create a seal. This inherent characteristic of stuffing boxes results in a trade-off; while they can leak more than mechanical seals, they are also generally easier to rebuild or adjust. The packing material can be replaced, and the assembly can be serviced without significant disassembly or specialized tools, making maintenance simpler.

In contrast, mechanical seals, designed for zero leakage, provide a more efficient and reliable seal but often require specialized skills and tools for repairs or replacements. This complexity is why they may not be perceived as easier to rebuild and typically have higher associated costs for parts and labor during repair.

Thus, stuffing boxes present the advantage of being easier to maintain despite their tendency to leak, distinguishing them from mechanical seals, which are built for efficiency and minimal leakage but at the cost of more complicated repairs.