(75) Inventor: Cameron Manners, Bowmanville (CA)
(73) Assignee: NuFlow Technologies (2000), Inc.,
Bowmanville, Ontario (CA)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 105 days.
This patent is subject to a terminal disclaimer.
(21) Appl. No.: 10/491,760
(22) PCT Filed: Oct. 3, 2002
(86) PCT No.: PCT/CA02/01480
§ 371 (c)(1),
(2), (4) Date: Aug. 3, 2004
(87) PCT Pub. No.: WO03/031857 PCT Pub. Date: Apr. 17, 2003
(65) Prior Publication Data
US 2004/0258479 Al Dec. 23, 2004
Related U.S. Application Data
(63) Continuation of application No. 09/972,184, filed on Oct. 5, 2001, now Pat. No. 6,691,741.
An installation assembly (20) for installing a liner (L) in a pipeline (P) comprises a double bladder assembly (22) including an inner bladder (26) having an installation end {26b) and a retrieval end (26c). An outer bladder (28) surrounds the inner bladder. The ends of the inner and outer bladders are coupled together adjacent the installation end via an inversion element (30). The inner bladder is coupled to an air source at its retrieval end and the outer bladder adjacent the retrieval end is free. Following installation and curing of the liner, the bladder assembly is retrieved by pulling on the retrieval end of the inner bladder, and upon retrieval, the outer bladder is inverted.
22 Claims, 9 Drawing Sheets
