| 摘要 |
A prestressed pressure vessel having an opening in one of its external surfaces to the interior thereof, and a removable closure member for closing the opening. The removable closure member includes an inner lid for engaging the one surface and an outer lid spaced from the pressure vessel by the inner lid and forming with the inner lid a fluidtight enclosure therebetween in which fluid under pressure can be supplied so as to move the inner and outer lids relative one another. At least one securing cable extends over the outer lid and is connected to the vessel at at least two points, and when fluid under pressure enters the fluidtight enclosure, tension on at least one cable is increased and is operatively transferred by the outer lid to the inner lid for urging the inner lid into tighter engagement with the portion of the pressure vessel surrounding the opening.
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