The internally-pressurised vessel is for material in bulk, its upper protion having the shape of a horizontal cylinder, closed by convex endpieces. One end-piece (7) is a part-spherical dish with cylindrical flange, bisected along its diameter, which is equal to that the cylinder. Its edge (29) formed by bisecting is joined to the top edge (30) of the outlet funnel at this end of the vessel, sloping outwards and extending the funnel at the bottom at the same angle and at the top at a steadily steeper angle. At the top, an intermediate piece (9) is fitted between the dish and the cylindrical portion of the vessel.
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