What type of stays are commonly used in Wetback (Scotch marine) type boilers?

The use of stay bolts and through stays in Wetback (Scotch marine) type boilers is essential for maintaining the structural integrity and safety of the boiler. These components work together to provide support to the boiler shell and ensure that it can withstand the internal pressures generated during operation.

Stay bolts are specifically designed to hold various parts of the boiler together, preventing movement and deflection that could lead to leaks or catastrophic failure. The term "through stays" refers to a specific type of stay bolt that passes completely through the boiler shell, anchoring both ends and providing additional strength against the forces acting on the boiler due to steam and pressure.

In Wetback boilers, which often feature a reverse layout of the combustion chamber, the correct use of stay bolts and through stays helps manage the stresses that arise from thermal expansion and contraction, as well as pressure fluctuations. This robust support system is crucial in maintaining the overall performance and longevity of the boiler.

Other options involve components that may not provide the necessary support or may be used in different contexts within boiler design. Understanding the importance of stay bolts and through stays is vital for ensuring safe and efficient boiler operation.