There are mainly five type of pressure head
a)Hemispherical - operating pressure is100psi at 450F°
b)Semi elliptical - its operating pressure is above 1.5N/mm2 .
c)Flanged - it is further divided into class based on operating pressure .
Class150 : 140psi at 600°F
Class 300 :570psi at 600°F
Class 2500 : 4730psi at 600°F
d)Flanged and dished - it is also known as torispherical .Operating pressure is moderate 8Kgf/cm2 .
e)Flat - operating pressure is 30000psi .
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