Reproduction process of the existing pipeline
US4796673A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Dec 24, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49718
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A reproduction process for an existing pipeline whether underground or overground includes the inserting of at least one rigid inner pipe having its front end temporarily blocked, and advancing the rigid inner pipe within the existing pipeline by means of fluid pressure applied to the interior of said inner pipe, or to the end of said inner pipe. Preferrably a rust-proof binding substance between the inner pipe and the existing pipeline is provided to unify the two pipes and provide a new integral pipeline. The new rigid inner pipeline may be made in sections which may be welded together as they are being inserted and are preferrably provided with bumps or projections around the external surface of the new rigid inner pipe in a spiral form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.