Steam cure of cured in place liner
View Patent ↗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 bladder is stored in a pressure bladder canister coupled to a pressurized downtube and eversion elbow. The bladder is everted by introducing pressurized air into the canister As the bladder reaches the distal manhole, it enters a receiving canister where it is punctured while maintaining air pressure within the bladder a pinch valve between the downtube and elbow isolates the inverted bladder so that steam can be introduced into the bladder to cure the resin and exhaust through the receiving canister. The bladder is then removed and lateral service reinstated.
1. A method for trenchless rehabilitation of an existing pipeline with a flexible resin impregnated liner, comprising:
introducing a flexible resin impregnated liner into an existing pipeline from a first access point to a second access point;
installing an inlet canister into the liner at the first access point;
installing an exhaust canister at the opposite end of the liner at the second access point, the exhaust canister including an exhaust coupling;
introducing air into the liner from the inlet canister to inflate the liner against the interior wall of the existing pipeline;
injecting steam into the inlet canister and adjusting the air/steam mixture through the liner and exit through the exhaust canister;
allowing the resin to cure;
cease introducing steam;
introducing air to cool the cured liner; and
allowing the cured liner to cool.
2. The method of claim 1 , comprising;
injecting an air/steam mixture into the inlet canister to heat the liner to about 220° F.
3. The method of claim 1 , comprising:
installing the liner by pulling in the liner from one access point to the other access point.
4. The method of claim 1 , comprising:
installing the liner by inverting the liner into the existing pipeline from one access point to the other access point.
5. The method of claim 4 , wherein the liner is inverted through the inlet canister.
6. The method of claim 3 , comprising; inflating the liner by inverting an inflation bladder into the pulled in liner.
7. The method of claim 1 , including introducing air into the liner through an inlet port for introduction of fluid in the inlet canister to maintain pressure and;
introducing steam into the inlet canister to pass through the liner and the exhaust canister.
8. The method of claim 1 , including introducing an air/steam mixture into the liner through an inlet port for introduction of fluid in the inlet canister.
9. The method of claim 4 , comprising:
installing the liner into the existing pipeline by introducing the liner through a selectively actuatable valve capable of allowing a liner to pass therethrough and capable of forming a seal to isolate the interior of an evening liner.
10. The method of claim 1 , including draining condensate through the exhaust canister.
11. The method of claim 3 , including inverting a bladder through the inlet canister into the pulled in liner.
12. The method of claim 11 , including;
stopping the inverting bladder before reaching the second access point;
installing the exhaust canister into the liner of the second access point; and
continuing the inversion so that the bladder enters the exhaust canister.
13. The method of claim 1 , including attaching an exhaust hose to the exhaust canister coupling.
14. The method of claim 13 , including adjusting the flow of air and/or steam exiting through the exhaust hose.