Patent ID: 8714597
Filing Date: 2014-05-06
Classification: F16L

Abstract:
1. A welded pipeline joint of a lined pipeline comprising: a main pipe; an extension piece having a generally tubular shape and an inner wall; an annular weld connecting the extension piece to the main pipe; the extension piece having an open end opposite the main pipe, the open end having an internal diameter; a liner extending through the main pipe and partially into the extension piece; a compression ring including a flange and a compression portion, the compression portion engaging the liner internally and compressing the liner radially outwardly against the extension piece so that the liner is sealed with the compression portion, the flange engaging the liner and being sealed with the inner wall of the extension piece thereby to prevent ingress of fluid between the flange and the inner wall; wherein a terminal end of the liner in engagement with the flange flares radially outward along the flange; wherein the annular weld constitutes a first annular weld, the welded pipeline joint further comprising a second annular weld between the flange of the compression ring and the extension piece forming a seal between the flange and extension piece; wherein the inner wall of the extension piece comprises an annular sealing shelf projecting radially inwardly and extending axially along the extension piece; wherein the flange includes a radially outward facing surface which is in engagement with the inner wall of the extension piece; and wherein the terminal end of the liner is in engagement with an end of the annular sealing shelf.