Method and devices for the extraction of a closure plug from a steam generator tube
US5086201A · kind A · utility
5Cited by
14References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1990 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Apr 3, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The body (4) of the plug (3) is rebored in the direction of its end wall (6) and the clamp block (7) is drilled by an electric machining process, over a substantial part of the length of the plug. The wall of the plug body (4) is relieved of stress with the aid of a welding torch introduced into the bore made by electric machining, and a gripping tool is introduced into the bore in order to extract from the tube the plug body (4) which has been relieved of stress.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.