Are diagonal stays used in water tube boilers?

In water tube boilers, diagonal stays are generally not used. The primary design of a water tube boiler involves tubes that carry water and steam under pressure, supported by various components to ensure stability. The structural integrity of these boilers is maintained through the framework of the tubes themselves and the arrangement of headers.

Diagonal stays are more commonly found in fire tube boilers, where they provide support against the pressure of the hot gases and help maintain the shape of the boiler against stresses. Since water tube boilers operate differently, relying on the strength of the tubes and their arrangement, the need for stays, especially diagonal ones, does not exist. This design choice enhances safety and efficiency in water tube boilers, negating the necessity for additional bracing that diagonal stays would provide.