Installation of cured in place liners with an endless reusable inflation bladder and installation apparatus
US6682668B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2000 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Nov 21, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C63/36
- 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 it with a reusable endless inflation bladder 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 maintained on a inflation bladder spool is everted into the collapse liner which is then forced against the interior surfaces of the existing conduit, allow to cure and the bladder removed and rewound on the spool. When the everting and curing fluid is hot water, the hot water is removed and stored for reuse as the inflation bladder is withdrawn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.