What is beading in the context of boiler tubes?

Beading refers to a specific method used to attach boiler tubes to the tubesheet. This process involves creating a raised bead or ridge around the tube's end, which helps secure the tube in place and provide a tight seal at the joint between the tube and the tubesheet. This is crucial because it ensures that the heat exchange occurs efficiently, while also preventing leaks of steam or water, which are vital for the safe and effective operation of the boiler.

The design of the bead helps to manage thermal expansion and contraction that occurs with temperature fluctuations, which is an important consideration in maintaining the structural integrity of the boiler system over time. This attachment method is significant in high-pressure boilers where the risk of leaks can lead to dangerous operational conditions.