| Patent application number | Description | Published |
|---|
| 20100031506 | Method for producing steam generator tube walls consisting primarily of 9-12% martensitic chromium steels - A method for producing steam generator tube walls, where the tube walls are formed from a tube-fin-tube combination and are comprised of a multiplicity of at least one of the tube wall components made of plane tube wall panels, curved tube wall panels, transition tube wall panels and corner bends and are configured with a take-up member with one penetration opening each at tube wall regions at which tubes are passed through the tube wall and the tube wall panels exhibit at the periphery longitudinal fin-fin panel joints and transverse circumferential weld-panel joints. The method including producing tube wall components made primarily of 9-12% martensitic chromium steels by welding in a workshop, the components having a material that is not to be heat treated at specific locations. Tempering the tube wall components in the workshop with a first heating device. Connecting the tube wall components at their circumferential weld-panel joints at the assembly site with weld seams. Tempering the weld seams at the assembly site with second heating devices. Connecting the tube wall components at their fin-fin panel joints at the assembly site with weld seams without subsequent tempering of these weld seams. Passing the prepared tubes through the take-up members of the tube walls and connecting the pipe with the take-up members at the assembly site with a weld seam without subsequent tempering of these weld seams. | 02-11-2010 |
| 20100064519 | Method for producing and assembling superheater tubes of steam generators - A method for producing superheater tubes and connecting pipes and assembling superheater tubes inside a steam generator tube wall includes preparing tubes composed of precipitation-hardened nickel-based alloys in a solution-annealed state for the straight tubes, the bends, and the connecting pipes in a workshop and preparing sleeves composed of a material that is not to be heat treated in a shop. The bends and the connecting pipes are manufactured in the workshop using bending tools. The superheater tubes are manufactured in the workshop by connecting the straight tubes and the bends with weld seams, and connecting the sleeves with the connecting pipes with weld seams. The superheater tubes and the connecting pipes having sleeves are precipitation hardened in the workshop in a first heating device. The superheater tubes are connected with the connecting pipes on the assembly site inside the steam generator tube walls with a weld seam and the sleeves are connected with the take-up device with a weld seam. The weld seams are precipitation hardened on the assembly site with second heating devices located proximate to the weld seams. | 03-18-2010 |
| 20100065159 | Method for producing and assembling superheater tubes of steam generators - A method for producing superheater tubes and connecting pipes and assembling superheater tubes inside a steam generator tube wall includes preparing tubes composed of precipitation-hardened nickel-based alloys in a solution-annealed state for the straight tubes, the bends, and the connecting pipes in a workshop and preparing sleeves composed of a material that is not to be heat treated in a shop. The bends and the connecting pipes are manufactured in the workshop using bending tools and then the straight tubes, the bends and the connecting pipes are precipitation hardened in the workshop in a first heating device. The superheater tubes are manufactured in the workshop by connecting the straight tubes and the bends with weld seams, and connecting the sleeves with the connecting pipes with weld seams. The weld seams between straight pipes and bends as well as the weld seams between sleeves and connecting pipes are precipitation hardened in the workshop with a second heating devices. The superheater tubes are connected with the connecting pipes on the assembly site inside the steam generator tube walls with a weld seam and the sleeves are connected with the take-up device with a weld seam. The weld seams are precipitation hardened on the assembly site with third heating devices located proximate to the weld seams. | 03-18-2010 |
