How are tubes typically attached to the drum of a boiler?

Tubes are typically attached to the drum of a boiler by rolling or welding. This method is essential because it creates a strong, pressure-tight connection that can withstand the high temperatures and pressures involved in boiler operation. Rolling involves deforming the ends of the tubes to fit tightly against the drum, creating a mechanical bond that supports the structural integrity of the boiler. Welding further enhances this connection, providing additional strength and sealing against leaks.

In contrast, fastening methods like screwing or bolting do not offer the same level of durability and pressure resistance required in boiler systems. Gluing, while useful in many applications, is not suitable for such demanding environments due to the need for robust, heat-resistant and pressure-tight joints. This emphasizes the importance of proper attachment techniques in ensuring the safety and efficiency of boiler operations.