Cylindrical Pressure Vessel Dish End

Cylinders are widely used for storage due to their being less expensive to produce than spheres. However, cylinders are not as strong as spheres due to the weak point at each end.

Vessel dished ends are mostly used in storage or pressure vessels in industry. These ends, which in upright vessels are the bottom and the top, use less space than a hemisphere (which is the ideal form for pressure containment's) while requiring only a slightly thicker wall.

Hemispherical head

A sphere is the ideal shape for a head, because the pressure in the vessel is divided equally across the surface of the head. The radius (r) of the head equals the radius of the cylindrical part of the vessel.


They are manufacture from a flat disc made of various types of steel. The dishing process presses the disc into various shapes such as torispherical, semi-ellipsoidal, hemisphere and cylindrical tank style which are welded onto the ends of a pressure vessel. The process involve dishing and spinning using hydraulic dishing press and flanging machine completes the dished end by spinning the required knuckle and the flange. The flanging machine allows the end to be welded to the tank body.


After shaping the crown through dishing, the bottom or head is given its final shape by flanging the knuckle radius. During this process, the material is formed between a forming and pressure roller such that the bottom or head exhibits a straight flange at the point of connection with the vessel shell.


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