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Heat-insulated pipe-lines

  • US 4,162,093 A
  • Filed: 06/13/1977
  • Issued: 07/24/1979
  • Est. Priority Date: 06/14/1976
  • Status: Expired due to Term
First Claim
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1. A heat-insulated joint between two heat-insulated pipe units, each of said pipe units comprising:

  • a pipe,an outer jacket of fluid-impervious material surrounding said pipe in coaxially spaced relationship therewith, and a filling of expanded heat-insulating material provided between said pipe and said outer jacket and extending over the greater part of the length of said pipe,the end parts of said pipe projecting beyond the corresponding ends of said filling and the end parts of said outer jacket projecting likewise but for a shorter distance, so that annular recesses are formed in the ends of the pipe unit,and said heat-insulated joint comprising;

    means interconnecting proximate projecting end parts of the pipes of said two pipe units,annular seals of rubberlike material located in the annular recesses in the proximate ends of the two pipe units,each annular seal having an outer circumferential portion lying in contact with the radially inner surface of the projecting end part of the jacket of the respective pipe unit and an annular portion supported by at least the radially outer part of the end face of the filling of the respective pipe unit,a tubular cover extending across the gap between the proximate end parts of the jackets and having its ends joined to the outer circumferential portions of said annular seals, anda further expanding filling of heat-insulating foam material within the annular space enclosed by the seals and the cover and surrounding the interconnected pipe end parts,the outer circumferential portions of the annular seals being held by said further filling in fluid-tight sealing contact with the radially inner surfaces of the projecting jacket end parts and the annular portions of the annular seals being pressed by said further filling in fluid-tight sealing relation toward the end faces of the corresponding pipe units.

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