Steampath and process of retrofitting a nozzle thereof
US5392513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1993 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49737
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process for replacing a multi-piece steampath in a nozzle box (12) where, initially, the steampath (22) is secured between upper (24) and lower (26) ring components by means of axially accessible, arcuate welds (36, 38) includes the steps of: PA1 a) axially machining the arcuate welds (36, 38) so as to permit removal of the steampath (22) in a direction axially away from the nozzle box; PA1 b) further machining a forward portion of the lower ring component to provide a substantially vertical weld surface; and PA1 c) securing a one-piece steampath (222) in place by an axially accessible upper weld (236) and a radially accessible lower weld (238). A nozzle box (212) for a steam turbine includes a torus portion 218 and a bridge ring portion (220), the bridge ring portion including radially inner and outer bridge rings (226, 224) connected by a plurality of bridge elements (234); a one-piece steampath (222) secured between the radially inner and outer bridge rings (226,224), the steampath (222) having integral upper and lower bands (232, 230) connected by integral steampath partitions (234), the steampath being secured to the upper ring (224) by an axially accessible weld (236) and t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.