Method for tapping into tubing under a controlled atmosphere, in particular for tubing in a nuclear power station
US4573628A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1984 |
| Grant date | Mar 4, 1986 |
| Priority date | — |
| Expiry date | Mar 20, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6123
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The method comprises the steps of: digging out a continuous groove (13) in the wall of the tubing at the location of the tapping point to be made, said groove being slightly shallower than the thickness of the wall, thereby leaving a membrane (14) of metal at the bottom of the groove between the inside of the tubing and the outside atmosphere; placing a sealed isolation unit on the tubing, said unit covering a wide area which is at least equal to the area delimited by the groove; breaking the metal membrane so as to make an opening in the wall of the tubing; removing the cut out portion of the wall; welding on a blind tail pipe; and removing the sealed isolation unit. The invention also provides a groove-digging device, and a membrane-breaking punch device (600).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.