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...http://www.google.com.tw/patents/US7216674?utm_source=gb-gplus-share專利 US7216674 - Installation assemblies for pipeline liners, pipeline liners and methods for installing the same
