Pipe joint

Claim 1

In a joint for two pipes both extending along an axis: a first pipe having a bell with a first radially outstanding flange; a second pipe having a spigot disposed in said bell; a deformable gasket surrounding said spigot and disposed in said bell; a compression ring disposed around said spigot and having a second radially outstanding flange; means including a bolt passing through said first radially outstanding flange and through said second radially outstanding flange for pressing said compression ring against said gasket; the combination of a first insulation layer having a first layer end, said first layer being disposed around and in contact with said first pipe in position to leave a first axial space between said first layer end and said first flange and to locate said first layer end radially inward of the periphery of said first radially outstanding flange; a second insulation layer having a second layer end, said second layer being disposed around and in contact with said second pipe in position to leave a second axial space between said second layer end and said second flange and to locate said second layer end radially inward of the periphery of said second outstanding flange; a first garter of heat-shrinkable material surrounding and in contact with said first pipe and overlying said first layer end; a second garter of heat-shrinkable material surrounding and in contact with said second pipe and overlying and in contact with said second layer end; a coaxial sleeve surrounding said first garter, said second garter, said first flange, said second flange and said compression ring; a first cuff surrounding one end of said sleeve and said first insulation layer; a second cuff surrounding the other end of said sleeve and said second insulation layer; means affording access to the interior of said sleeve and of said first cuff and of said second cuff; and a foam mass within said sleeve and said first cuff and said second cuff.