Installation of cured in place liners with air and steam and installation apparatus
US6708728B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Oct 24, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C63/34
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for lining an existing pipeline or conduit with a flexible resin impregnated cured in place liner by pulling in the liner and inflating an eversion bladder with air and curing the liner with flow-through steam without loss of pressure is provided. The liner includes a resin absorbent material in tubular form with an impermeable membrane forming an outer layer. The absorbent material is saturated with a thermoset resin and pulled into the existing conduit. A flexible inflation bladder is passed through a gland mounted on an eversion apparatus and everted into the collapsed liner. The gland is pressurized to isolate the eversion bladder. As the bladder reaches the distal manhole, it enters a receiving canister where it is punctured while maintaining air pressure within the bladder. Steam is then introduced into the bladder to cure the resin and is exhausted through the receiving canister. The bladder is then removed and lateral service reinstated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.