STRESS ANALYSIS ON PRESSURE VESSEL

Abstract

Researches done prior to this study focuses on designing of pressure vessel, theoretical studies on failure modes and catastrophic accidents of pressure vessel. This study intents to analyse stress effect based on ASME VIII Division I, PD 5500, and EN 13445 and design a storage tank using PVElite. This study is done for varying internal design temperature and internal design pressure. It is limited by tank capacity, size, type, shape and orientation of pressure vessel. The external design temperature, external design pressure, head type, joint efficiency, diameter, length, and corrosion allowance are restricted as well. The study is done by selecting type of pressure vessel, code of practices, materials and design parameters before performing analysis using PVElite. A LPG storage tank was designed using PVElite. A total of twelve simulation is done and the results are tabulated. It is seen that American standard is capable of simulating for internal temperature less than external temperature which is not possible than the other two counterparts. Here, the external temperature is set at 250C and the internal temperature varies from 00C – 600C with increment of 200C. British and European standard had an error while performing simulation for 00C and 200C The American standard also has the highest value for required thickness for external thickness for head and shell with 3.36518mm and 5.45026mm for head and shell respectively. The internal thickness for American standard is also the highest with 2.5mm, 2.65822mm, 4.01886mm and 6.14440mm for head thickness at 00C, 200C, 400C and 600C respectively while shell thickness is 2.5mm, 2.66606mm, 4.03766m and 6.18855mm for 00C, 200C, 400C and 600C respectively. Stress computed for head and shell for American standard was also the highest with 19.074 MPa, 38.148 MPa, 64.429 MPa and 118.258 MPa at 00C, 200C, 400C and 600C respectively for head and 15.525 MPa, 25.772 MPa, 60.151 MPa and 102.455 MPa for 00C, 200C, 400C and 600C respectively at shell. It is concluded that American standard is the better option of the three.