What is the minimum temperature at which boiler tube expanders should operate for optimal performance?

The correct answer is rooted in the operational principles of boiler tube expanders, which are designed for use with steam and water at certain pressure levels. Optimal performance of boiler tube expanders occurs at a minimum temperature associated with a pressure of 100 psi, allowing for sufficient thermal expansion of the tubes being expanded.

At 100 psi, the temperature of the steam or water is generally around 338°F (170°C), which provides the necessary heat to ensure the materials are malleable enough for the expander to effectively perform its task. This temperature not only facilitates the expansion of the tube but also helps in achieving a secure fit without damaging the metal structure, ensuring that the boiler operates efficiently and safely.

Operating the expanders below this threshold could compromise the integrity of the expansion process, leading to insufficient contacts between the tubes and fittings, which might result in leaks or failures under operating conditions.