Hemispherical Heads

A hemispherical head is frequently employed in large-diameter or high-pressure applications when space is limited.
Hemispherical tank head that has been reversed flanged and dished

Hemispherical Tank Heads

Strength and Resistance

Hemispherical (hemi) heads are the strongest of the formed heads. They can resist about twice the pressure rating of an elliptical dished head or cylindrical shell of the same thickness and diameter. Due to their strength and resistance, these tank heads are widely used for the storage of liquids and gasses under pressure.

Features

Better Distribution

The hemispherical head features a thinner head than the shell. This head uses a standard code 3:1, which allows for better distribution and resistance to deformation.

Twice the Pressure Rating Resistance

Hemispherical tank heads can resist about twice the pressure rating of an elliptical dished head or cylindrical shell of the same thickness and diameter.

High-pressure Applications

With a hemispherical head, the pressure in the vessel is divided equally across the surface of the head. This ensures that the vessel can withstand the pressures it is subjected to. Additionally, it helps to distribute the pressure evenly so that no one area is under more strain than another.

Storage Applications

Using two hemispherical heads back to back creates the most efficient shape for pressurized storage.

Materials

Hemispherical tank heads are made from: steel, carbon, aluminum, titanium, and more.

Specifications

Inside Dish Radius

50% of diameter

Typical Thin Out Allowance

1/2″ and under – Add .03125″ to the minimum

Over 1/2″ – Add .0625” to the minimum

All Hemispherical heads are offered as segmental construction.

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Ready for a Quote?

Contact us today for a custom quote on your hemispherical head project. Whether you’re looking for tank heads or complete spheres for high-pressure storage, Brighton Tru-Edge can deliver.