The end caps on a cylindrically shaped Pressure vessel are commonly known as heads.
The shape of the heads used can vary. The most common[1][2][3] head shapes are:
Also other sizes are: ,[5](page13) rest of height (lets say ) .
Also other sizes are: , rest of height (lets say ) . This shape[6] finds its origin in architecture.[7]
Heat treatment is usually required after cold forming, but not required by heads formed by hot forming: