Pressure vessel joint

Claim 1

A joint between a pressure vessel lid (5) and a pressure vessel comprising a thin-walled container (2) which is supported by an external support structure (30, 12, 16), said joint comprising an annular flange (1) which is directed towards the container axis, and which is fastened at the rim of the inner container (2), screws which are arranged to clamp the rim of the lid (5) onto the flange (1), and a sealing gasket (4) between the flange (1) and the lid (5), characterized in that the support structure (30, 12, 16) which extends axially past the container rim on its inside beyond the container rim exhibits a support ring (8) with a support surface (8a) facing the interior of the container that a gap is present between the peripheral edge of the lid and the support surface (8a) that blocks (7) are positioned in the gap, said blocks having a recess (20) for the upper edge of the lid (5) that the screws (11) extend through the blocks (7) and clamp, via the blocks (7), the lid (5) against the flange (1), that in the unloaded condition of the pressure vessel, an axial play (S) is arranged between the support surface (8a) and that side of the blocks (7) facing the support surface (8a), said play (S) being adapted to be eliminated for a pressure vessel pressurization, which brings about a container elongation substantially equal to the play, and that a lubricant (16) is arranged between the support structure at least part of the surface of the container, whereby the screws (11) only need stand the load referring to said vessel pressurization and the load referring to required comprimation of the gasket.