What are the common methods used to patch boiler drums and shells?

Bolting, riveting, and welding are commonly used methods for patching boiler drums and shells primarily due to their strength and durability. These methods ensure a secure and long-lasting repair that can withstand the high pressures and temperatures typically found in boiler operations.

Welding, in particular, is favored because it creates a permanent bond between the metal pieces, effectively restoring structural integrity. This method allows for flexibility in handling various repair needs, such as patching holes or cracks that may occur from wear and tear or stress.

Bolting and riveting are also practical choices, especially in situations where welding may not be feasible due to the condition of the metal or the design of the boiler. These mechanical fastening techniques provide substantial strength and resistance against the forces experienced in a boiler system.

In contrast, other options involve methods that either lack the structural integrity needed for such repairs or are not suitable for high-pressure environments. For example, gluing and sealing, as well as using fiberglass and caulking, might work for lighter applications but do not provide the robust solution required for the demanding conditions of boiler drums and shells.