High pressure live service pipe renewal apparatus and method
US6273644A · kind A · utility
Inventors
Key dates
| Filing date | May 14, 1999 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/904
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for inserting a new service pipe into an existing high pressure service pipe that contains a leak, without the necessity of excavation or separately shutting off the supply of the high pressure gas upstream of the effected pipe section. A nosecone coupled with a unique stopper assembly allows a temporary sealing of the high pressure pipe between the main and the leak point, and insertion flow of a sealer through the nosecone, such that the sealer fills the annular space between the new pipe and the old pipe, providing a gas tight permanent seal. The end of the stopper assembly has temporary stop plug that must be drilled open to reestablish the communication of high pressure gas into the new pipe without the chance of flow entering the old pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.