Temporarily blocking the bore of a pipe through which a fluid flows with a foamed plus removed by dissolving
US5400826A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1993 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Apr 26, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/134
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method and kit is provided for temporarily blocking the bore of a pipe through which a fluid flows, the kit including an expansible flexible bag seal which is inserted through a hole provided in the wall of the pipe 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 is injected into the bag seal. 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.