Dished Head Forming

  • Dished Head
  • Torispherical Dished Head
  • Dished Head Forming
  • Hemispherical Head

Dish Head Forming

Ellipsoidal Head
Ellipsoidal head (elliptical head or elliptical dish end) is usually made with Carbon steel, stainless steel, austenitic and non ferritic metals that can be cold worked. The shape of this ellipsoidal head is more economical, because the height of the head is just a fraction of the diameter. The elliptical dish end radius varies between the major and minor axis usually with the ratio is 2:1. The elliptical tank head is the economical solution for medium pressure tanks due to the reduced metal thickness requirement.

Torispherical Dished Head
Torispherical Dished Head is also called torispherical dish end or torispherical ends. The Torispherical Dished Head consists of a spherical surface, a cylindrical edge of a certain height, and a transition section connecting the above two parts with a radius of curvature smaller than the radius of the sphere. Our asme Torispherical Dished Head can be made with carbon steel, stainless steel, austenitic and non ferritic metals that can be cold worked. The stress distribution of torispherical dish head is not as uniform as elliptical head, but the manufacturing processing of the torispherical head is easier. However, torispherical dish end is the better option when the elliptical head of the mold processing is difficult. We can fabricate torispherical ends in most popular sizes and thicknesses.

Hemispherical Head
Hemispherical Head (also called hemispherical tank heads or hemispherical dish ends) is widely applied to make pressure tanks to storage liquids and gasses.
Our asme hemispherical head is often made with carbon steel, stainless steel, austenitic and non ferritic metals that can be cold worked.
Hemispherical is the ideal shape for development of hemispherical dish end, because the pressure in the vessel is divided equally across the surface of the head.
The radius (Ri) of the head equals the radius of the cylindrical part of the vessel. This type of hemispherical tank heads or hemispherical dish ends are made in most popular sizes and thicknesses.

Conical Head
Conical Head (also called the tapered tank head) is widely used for vessel bottom or cover plates. Our asme conical head is often made with carbon steel, stainless steel, austenitic and non ferritic metals that can be cold worked.
With the shape of concentric cone, the toriconical head consists of a large end cone and a small end. Cone and large end of the connection, due to geometric discontinuity, the radius of curvature of the mutation, so there will be a large lateral thrust, causing a large edge stress, prone to bending, it is necessary to strengthen.
Conical head type is divided into CHA (30), CHA (45), CHA (60) by half angle. According to the size of the end of the type is divided into non-folding conical tank head and hemming conical dished head.
The conical head is applied for the bottom of the pressure vessel to facilitate the collection and removal of internal materials and for the connection of two-stage vessels of varying diameters (also known as variable diameter sections).

Spherical Dish Head
Spherical Head used for oil, chemical industry, water conservancy, electric power,boiler, machinery, metallurgy, sanitary construction etc.
Spherical head advantages is same with spherical vessel, with good stress state, it only needs 1/2 wall thickness of cylinder, spherical head is mostly used in high pressure vessels, such as urea synthetic tower,CO2 stripper,etc.
For the medium and low tension pressure vessels, for convenient welding, also consider the deduction during head forming process, normally the head and cylinder adopts the same thickness.
spherical head is mainly made by carbon steel or low alloy steel material, with low price, the forming appearance is very beautiful. The fabrication method is complete plate fabrication, big diameter spherical products can also adopt fragment forming then combined weld method.

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