Method and combination for installing a liner within a service pipe transversely connected to a main pipe

  • US 5,108,533 A
  • Filed: 10/10/1989
  • Issued: 04/28/1992
  • Est. Priority Date: 10/10/1989
  • Status: Expired due to Term
First Claim
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1. A combination liner and apparatus for installing the liner within a service pipe having a first inner diameter, an access end and a terminal end wherein the terminal end is transversely connected to a main pipe for allowing fluid to flow therebetween, the main pipe having a second inner diameter, the combination comprising:

  • a liner in the form of a flexible tubular member having a leading end and a trailing end, said leading end including a flexible retainer secured thereto for being positioned within said main pipe proximate said service pipe terminal end, said flexible retainer being generally annular and having an outer diameter which is greater than the first inner diameter of the service pipe for securing said leading end within said main pipe proximate said service pipe terminal end, a portion of said leading end of said flexible tubular member being rolled over said flexible retainer to secure said flexible retainer to said leading end of said flexible tubular member, said flexible tubular member being impregnated with a thermosetting resin which cures after said flexible tubular member is positioned within said service pipe;

    installing means for positioning said flexible tubular member within said service pipe such that said flexible retainer is seated within said main pipe proximate said service pipe terminal end and said trailing end is positioned proximate said service pipe access end, said installing means includes a guide member releasably secured to the leading end of said flexible tubular member for guiding said flexible tubular member leading end through said service pipe access end and through said service pipe terminal end such that the flexible retainer is positioned within said main pipe; and

    curing means positioned within said flexible tubular member for forcing said flexible tubular member radially outwardly into engagement with said service pipe and for aiding the curing of said resin whereby said service pipe is lined with said flexible tubular member.

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