Pressure vessels are used to store liquids under high or normal or low pressure, with or without sudden and abrupt temperature variation. While under the operating condition, the vessel experiences mechanical stresses due to the pressure...
morePressure vessels are used to store liquids under high or normal or low pressure, with or without sudden and abrupt temperature variation. While under the operating condition, the vessel experiences mechanical stresses due to the pressure of the stored liquid and or thermal stresses due to high amplitude thermal shocks. A normal pressure vessel with no thermal shocks mainly fails with the largest mechanical stress component generated within it, mainly Hoop stress or bursting stress. When the stress exceeds the yield stress of the material, plastic deformation happens and if the stress increased beyond the ultimate stress, the material fails and hence, the vessel fails. This sudden fracture of the wall may result severe damage to surroundings and as well as damage economically. Cryogenics deals with fluids under low temperature as below as 70 K temperature. This type of boundary condition not only generates mechanical stress but also a dominant amount of thermal stress. Under this condition designing and maintaining a pressure vessel gives rise to some serious challenges. This work focusses on the various issues from design aspect of the Cryogenic Vessel storing liquid helium having a temperature of 4 K. The heat load of the vessel should be optimized to have a mean time between maintenance (MTBM) lies around 30 days. The design has been validated following ASME Section VIII division 1 and 2 by both numerically and analytically. The numerical validation has been performed in ANSYS APDL and the analytical validation has been done using PV Elite 15.0.
