How must boiler tube ends be prepared prior to installation?

Boiler tube ends must be cleaned and polished prior to installation to ensure a proper fit and to promote a reliable seal when the tubes are joined to other components. This preparation is crucial because it removes any contaminants, oxidation, or debris that could interfere with the effectiveness of the joint. A clean and smooth surface allows for better heat transfer and helps reduce the risk of leaks.

Other methods of preparation, such as painting or greasing, can introduce materials that may hinder the quality of the weld or seal. Welding is performed afterward to secure the tubes in place, not as a preparatory step. By focusing on cleaning and polishing, machinists ensure that the integrity of the boiler system is maintained and that it operates efficiently.