Installation assemblies for pipeline liners, pipeline liners and methods for installing the same

  • US 6,691,741 B2
  • Filed: 10/05/2001
  • Issued: 02/17/2004
  • Est. Priority Date: 10/05/2001
  • Status: Expired due to Term
First Claim
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1. An installation assembly for installing a liner in a pipeline, said installation assembly comprising:

  • a bladder assembly to be inserted into a liner, said bladder assembly including;

    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 carried by said bladder assembly so that said liner can be brought into firm contact with an interior surface of said pipeline; and

    a retrieval line for removing said bladder assembly from said pipeline, said retrieval line being coupled to the retrieval end of said inner bladder so that when said bladder assembly is removed from said liner with said inner bladder deflated, said outer bladder separates from said liner and inverts.

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