For pre-owned boilers constructed to ASME code, what is the factor of safety?

The factor of safety for pre-owned boilers constructed to the American Society of Mechanical Engineers (ASME) code is established to ensure that these boilers can withstand operating conditions while minimizing the risk of catastrophic failure. A factor of safety of 4 indicates that the design allows for stresses that are one-fourth of the ultimate strength of the materials used, providing a substantial buffer against unexpected loads, wear, and deterioration that may occur over time in pre-owned equipment.

This higher factor is particularly important for pre-owned boilers since their materials may have experienced aging, potential corrosion, or wear not present in new equipment. By using a factor of safety of 4, the design takes into account these uncertainties, ensuring safe operation and reliability in service. The requirement helps protect users and facilities from the risks associated with the operation of older equipment, where material integrity might be compromised compared to newer boilers.