Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size

Claim 1

Temporary fluid-tight obturation panel for a passage into a vessel accessible only through an aperture of dimensions less than those of the passage to be obturated, the periphery of the passage to be closed comprising a support collar provided with threaded holes, said obturation panel being constituted by: at least two panels articulated together by flexible fluid-tight hinges, the size and number of panels being determined to enable passage through the access aperture of the set of panels folded on one another, each panel comprising along its articulated edges a series of latching pins, a set of stiffeners equal in number to that of the hinges of the panel, each stiffener comprising two lines of holes conjugate with the lines of the latching pins of two contiguous panels, a frame in at least two parts articulated and foldable on one another, reproducing in folded position the contour of the support collar and comprising means to grip, with the interposition of a seal, the ends of the panels and of the stiffeners against the support collar, by screwing into the threaded holes.