Abstract: A buckstay system for a membraned-tube wall having a first wall section which meets a second wall section at an angle to form a corner, utilizes the natural load carrying ability of membraned tube wall construction to simplify or eliminate structural components previously utilized at such locations. Some embodiments use the membraned-tube wall corner configuration alone, or in combination with corner reinforcing plates and/or stiffening members to distribute combustion gas pressure loads to adjacent membrane-wall panels. Other aspects provide reinforcement only to accommodate transient overpressure conditions.

Abstract: An attachment arrangement for attaching a boiler casing to a membrane tube wall utilizes an extension plate which is connected to and extends beyond an edge of the casing. The extension plate and the surface of the casing adjacent its edge define an attachment area which is attached to the tube wall. A slot extends in the casing and through part of the extension plate. The slot is covered by an expansion element having a termination covering the end of the slot. The termination is on the extension plate. The termination of the expansion element extending over the extension plate provides compensation for expansion in the attachment area which avoids deformation and tearing of the casing in this area.