| 摘要 |
An installation assembly for installing a liner in a pipeline comprises an inner bladder having an installation end and a retrieval end. An outer bladder surrounds the inner bladder. The ends of the inner and outer bladders are coupled together adjacent the installation end. The inner bladder is coupled to an air source at a 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. |
