Hemispherical Head
The hemispherical head is a head consisting of half a spherical shell and a straight edge (short section of a cylinder). Hemispherical heads has the best mechanical properties and most economical materials used.
Hemispherical heads are a popular choice for pressure vessels due to their ideal shape, which divides the pressure in the vessel equally across the head's surface. Also known as hemispherical tank heads or hemispherical dished ends, they're commonly used on liquid and gas storage tanks.