DEVICE FOR SEALING AN OIL PIPELINE Russian patent published in 1994 - IPC

FIELD: oil-pipelines exploitation. SUBSTANCE: annular projection of the insertion has longitudinal section shaped as tapering and expanding portions, Within the insertion an elastic plug is set up with its side wall being in contact with the inside of the annular projection. On one side of the plug a conical step is provided with a blind opening and on the other side of it - a metallic disk is position coaxially to the plug. The maximum diameter of the disk exceeds the diameter of the minimal cross section of the insertion. In an expanding part of the insertion a catcher is disposed which is aligned with the plug and has the form of a cylindrical sleeve with apertures made in its side wall. The disk has a sharpened stem with its point being directed toward the catcher. The portion of the catcher adjacent to its blind end if filled with a fibrous or frothed material. The thickness of which is equal to the length of the stem portion projecting beyond the end of the plug. The axial length of the plug does not exceed the distance between the blind end of the catcher and the nearest edge of the outlet opening of the cylindrical pocket. The inner diameter of the pocket exceeds the maximum diameter of the plug. EFFECT: enhanced reliability of sealing. 1 dwg