Securing polymer liners within pipes
US12097653B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2020 |
| Grant date | Sep 24, 2024 |
| Priority date | — |
| Expiry date | May 28, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C63/36
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing a length of lined pipe inserts a radially contracted liner pipe into an outer host pipe. Injector needles are inserted through an end of the outer pipe into an annular gap between the pipes. Adhesive is injected between the pipes at locations inboard of the end of the outer pipe. After withdrawing the injectors, at least a portion of the liner pipe is expanded to close the gap and to bond the pipes together via the injected adhesive. Shims can be inserted into the gap between the pipes. A portion of the liner pipe inboard of the shims can be expanded radially while the shims constrain local radial expansion of an outboard portion of the liner pipe to maintain the gap for accommodating the injectors. Withdrawing the shims after injecting the adhesive allows radial expansion of the outboard portion to close the gap between the pipes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.