How are the sections of a cast iron sectional boiler held together?

In a cast iron sectional boiler, the sections are typically held together using tie rods. These rods provide the necessary tension to keep the sections tightly assembled, which is crucial for maintaining the integrity of the boiler when it is in operation. As the boiler heats up and pressure builds, the tie rods help prevent the sections from separating or flexing, ensuring a safe and efficient operation.

Tie rods are especially important in this context because they can accommodate the thermal expansion that occurs as the boiler heats up, maintaining a secure fit without risking damage. This feature is particularly beneficial in cast iron boilers, where the material is prone to cracking if not secured properly.

While stay bolts are also used in some boiler designs, particularly in non-sectional models, tie rods are the primary method for securing the sections in cast iron sectional boilers. Other mechanisms like steel studs or cast iron pipes do not serve the same function in this type of assembly. Understanding the role and function of tie rods gives insight into the structural integrity required in boiler operations, highlighting their importance in safe power engineering practices.