DESIGN AND ANALYSIS OF SPHERICAL PRESSURE VESSEL AS PER MANUFACTURING ASPECT

Pressure vessel are largely used in industries owing to its feature in storing liquid or gas. Method used for manufacturing spherical pressure vessel include explosive forming, Blow forming, Hydro-bulging process, Die forming and Hydroforming process. Spherical vessel for large thickness is difficult to fabricate from single piece die so Spherical vessel fabricated in forming industries are in from two piece of hemispherical shape and multiple pieces having shape of trapezoidal, hexagonal, rectangular petals, which are welded together. The complete procedure for designing is provided by ASME code, In Section 8 Div. 1. When spherical vessel with very large diameter is difficult to manufacturing in two piece. In present work the various literature surveys conducted on design and fabrication of spherical vessel also complete design procedure of spherical vessel and FE simulation of single piece hemispherical dish end is carried out validate with case study given in literature. Also, FE simulation spherical pressure vessel carried out, based on this thinning analysis, further analysis is carried out for different number of petal with and without consideration of crown. Furthermore, we derived the analytical equation for determining the parameter of the crown and petal, and we had done number of analysis for different number of petal and crown, By doing FE simulation we can predict the percentage of thinning for vessel which can extremely supportive for spherical vessel manufacturing industries at early stage in calculating thinning allowance of vessel and optimum value of petals for minimizing total cost is obtained.