Patent ID: 7216674
Filing Date: 2007-05-15
Classification: F16L

Abstract:
1. An installation assembly for installing a liner in a pipeline, said installation assembly comprising: an inflatable inner bladder having an installation end and a retrieval end and defining an internal reservoir; and an outer bladder surrounding said inner bladder at least along a portion of the length thereof, said outer bladder having an end coupled to said inner bladder adjacent said installation end; a fluid passage coupled to said inner bladder, said fluid passage for introducing fluid into said internal reservoir to inflate said inner bladder and expand a liner generally surrounding at least a portion of said outer bladder so that said liner can be brought into firm contact with an interior surface of said pipeline; and a retrieval line for removing said inner and outer bladders from said pipeline, said retrieval line being coupled to the retrieval end of said inner bladder so that when said inner and outer bladders are removed from said liner with said inner bladder deflated, said outer bladder separates from said liner and inverts.