At what temperature should a safety valve on a superheater be protected with heat resisting materials?

The safety valve on a superheater should be protected with heat-resisting materials starting at 450 degrees Fahrenheit. This temperature is critical because above this threshold, the integrity of the materials used in the valve and its components can be compromised by high heat. Proper insulation and the use of heat-resistant materials help maintain the valve's functionality and reliability, ensuring safety in operations that involve high-pressure steam and elevated temperatures.

At temperatures lower than 450 degrees Fahrenheit, while there can still be some thermal stress, materials are generally more resilient and less likely to degrade or fail. However, once the temperature reaches 450 degrees Fahrenheit, the potential for overheating and thermal expansion becomes significant, which is why protective measures become imperative at this level. Therefore, the standard practice is to implement heat-resistant materials at this specified temperature to safeguard the equipment and ensure optimal performance.