At what pressure level must a blowdown occur more frequently to ensure safe operations?

Blowdown is a critical procedure in boiler operations that helps maintain water quality and remove impurities that can accumulate over time. As pressure levels increase in a boiler, the potential for harmful deposits and scale also increases due to the more intense conditions within the boiler system.

At a pressure level of 100 psi, this pressure represents a significant operating range for many high-pressure boilers where maintaining water quality becomes crucial to ensure efficient operation and prevent damage. At this level, the need for proper blowdown frequency arises because higher pressures can lead to increased concentration of dissolved solids in the boiler water. Frequent blowdown helps remove these solids, mitigating risks such as corrosion, scaling, and potential boiler failure.

When operating at the pressures indicated in the other options, while blowdown is still necessary, the frequency and rigor of the blowdown program generally increase at higher pressure levels. Notably, 100 psi is a threshold where water quality must be more diligently managed, making it critical to perform blowdown more frequently at this pressure to maintain safety and efficiency in boiler operations.