American Society of Mechanical Engineers (ASME) Practice Exam

The maximum temperature allowed for a threaded boiler connection is significant because it directly impacts the safety and integrity of the boiler system. Threaded connections are typically less reliable than welded connections because they can be more susceptible to leaks and material fatigue under high temperatures and pressures. The value of 925°F corresponds to the limits established by regulations and best practices in boiler design and operation. At temperatures exceeding this threshold, there is an increased risk of mechanical failure, which could lead to leaks or catastrophic failure of the boiler system. Ensuring that all components, including threaded connections, operate within these temperature limits is crucial for maintaining safe and efficient boiler operation. Higher temperature limits, such as those found in other options, can compromise the physical properties of the materials used in threaded connections, increasing the likelihood of stress and deformation. This can also lead to a higher risk of thermal stress corrosion, which may further jeopardize the safety of the boiler. In summary, keeping the maximum temperature for a threaded boiler connection at 925°F aligns with safety standards and helps prevent potential failures, making it the correct choice in this context.