Pipe joints

In a joint between two pipe sections, each pipe section being of the type including an outer metal pipe and an inner liner of rubber or synthetic resin material, wherein metal jointing flanges are provided on the adjacent ends of the pipe section, and wherein each liner extends from the interior of its associated pipe section radially outwardly to form a liner extension covering a portion of the respective flange and terminating in a generally annular surface, the joint including means for urging the flanges towards one another so that a seal is formed between the mating faces of the two liner extensions lying between the flange portions, the improvement comprising an annular metal ring between substantially planar, parallel faces of the jointing flanges and radially outwardly of the liner extensions, said metal ring comprising an outer annular wall and at least two radially inwardly extending annular spaced apart legs defining a generally annular channel outwardly of said liner extensions, said legs being resiliently deformable relative to each other and said outer wall to permit said flanges to be urged toward each other to form a seal between said liner extensions, said metal ring and the channel formed thereby covering said liner extensions to protect said extensions from external conditions and to reduce leakage from the joint in the event of failure of the seal between the liner extensions.