100-10 torispherical head means crown radius of the head is equal to the diameter of the vessel and knuckle radius is 10% of the diameter of the vessel.Torispherical heads are classified as 100 -10 100 6 80-10 and so on. Thickness of torispherical head depends upon the ratio of crown radius to knuckle radius also.It requires less thickness as compared to standard torispherical head. a dish radius equal to 80% of the head diameter and a knuckle radius equal to 10% of the head diameter can be used. It means crown radius equal to diameter of vessel and knuckle radius 6% of diameter. Torispherical head with 100-6 design is common.Heads can be formed by hot forming or cold forming. Torispherical and shallow flanged dished head has been very common for low pressure operations.Elliptical head is used for pressures above 15 kg/cm2 and requires higher wall thickness and is very difficult and costly to fabricate.Hemispherical head is used only for special purposes because of its very high fabrication cost.Hemispherical, torispherical and elliptical heads are commonly used for process equipment.The designer should select a head thickness that can be formed as economically as possible. Thinner materials require more severe configurations that increase the cost of fabrication. As the metal becomes more expensive, it becomes necessary to use thinner and small blank diameter for forming the head. Manufacturing cost is based on combination of shape, thickness and method of forming.
Selecting the most Economical Vessel Head:- The cost of any pressure vessel head is based on a combination of metal costs and manufacturing costs.
Selecting the most Economical Vessel Head