Temporarily blocking the bore of a pipe through which a fluid flows with a foamed plug removed by dissolving
US5687771A · kind A · utility
7Cited by
1References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1994 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Nov 30, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/134
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A kit is provided for temporarily blocking the bore of a pipe through which a fluid flows, the kit comprising an expansible flexible bag seal which is inserted through a hole provided in the wall of the pipe and an apparatus for injecting into the bag seal a quantity of a material adapted to expand in situ in the bag seal and inflate the bag seal to seal against the inside of the pipe. The pipe may be a gas main and the material may be an expandable synthetic resin foam. The bag seal is removed by injecting thereinto a substance capable of dissolving the foam so that the bag seal can be at least partially deflated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.