Abstract: A steam reformer tube assembly includes a reformer tube including a wall defining an interior space for receiving fluid delivered into the reformer tube, a plug at least partially positioned in an opening in the interior space such that a gap is defined between the plug and the wall of the reformer tube, and a sealing member positioned in the gap to either limit or prevent the passage of fluid toward the opening in the interior space of the reformer tube and along the gap that is defined between the exterior surface of the plug and the interior wall of the reformer tube. A method of assembling a steam reformer tube assembly is also provided.

Abstract: An exhaust stack for a combustion zone of a furnace includes a main stack having a first chamber therein in communication with the combustion zone, and a main damper disposed for movement within the first chamber to be positioned to provide a cross-section of the first chamber through which combustion products from the combustion zone may flow, and a secondary stack having a second chamber therein in communication with the first chamber and being disposed within the first chamber, the secondary stack having a second damper disposed for movement within the second chamber to be positioned to provide a cross-section of the second chamber through which the combustion products from the combustion zone may flow.

Abstract: A steam reformer tube assembly includes a reformer tube including a wall defining an interior space for receiving fluid delivered into the reformer tube, a plug at least partially positioned in an opening in the interior space such that a gap is defined between the plug and the wall of the reformer tube, and a sealing member positioned in the gap to either limit or prevent the passage of fluid toward the opening in the interior space of the reformer tube and along the gap that is defined between the exterior surface of the plug and the interior wall of the reformer tube. A method of assembling a steam reformer tube assembly is also provided.