The shape of the heads used can vary. The most common head shapes are:
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.manufactures seamless ASME hemispherical tank heads of many sizes from500mm-5000mm For high pressure projects, the advantage of a Hemisphere is that most ASME code calculations require less minimum thickness to hold high pressure than a 2:1 Elliptical head.
Hokkai has thress press machine which can form heispherical heads, the max size that we can do is 5000mm as we had the tooling
The size is popular used for food and oil&gas industry and may be requried by ASME U&U2 stamp holder sometimes
Our company are ASME U&U2 stamp holder and can provide dished heads as PED/NB/GB/ASME standard
The below process are our normal way to form dished heads. We can quote and form dished heads after you gave us the details as the below process.