| 摘要 |
A sealing structure for the upper end of a rising or conveying pipeline, which sealing structure is provided between the riser pipe hanger and the riser pipe cover and aims at providing a metallic seal whose safety is superior to that of the seals known up to now. This is achieved by the insertion of metallic O-ring seals (13, 13') in annular spaces of triangular cross section of which one end wall is formed by the inclined contact pressure shoulder (11) of a thrust collar (8,9) which can be subjected to pressure by means of clamping spindles (14, 14') arranged essentially at right angles in relation to the rise pipe axis (10) and screwed into the riser pipe cover (4), whereby an additional pressing of the seals (13, 13') is made possible.
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