To what distance should the boiler tube ends be polished when preparing for installation?

Polishing the boiler tube ends is essential for ensuring a tight seal and preventing leaks during installation. The correct distance of 2-3 inches allows for sufficient surface area to be polished, which promotes better contact with the tube sheets and enhances the effectiveness of sealing materials used in the assembly. This distance is also a balance; it provides enough polished area to ensure a good seal while avoiding excessive polishing that can lead to unnecessary wear or damage to the tube ends. This practice is crucial to maintain the integrity and safety of the boiler during operation.