Informatics Publishing Limited

A. M. Senthil Anbazhagan ¹, M. Dev Anand ¹

Affiliations
1 Department of Mechanical Engineering, Noorul Islam Centre for Higher Education, Kumaracoil – 629 180, Thuckalay, Kanyakumari District, Tamil Nadu, IN

Abstract

The wind and seismic design is a major requirement in equipment design in oil and gas industries. In this paper we have investigated how height column intended for being designed to withstand weighty external seismic and wind effects and few significant design steps intended for considering in order to avoid column failures. Finite element based design approach is recommended as this is not a normal industrial practice currently. Many of the fabrication industries are following analytical based approach. That may be the reason some times under designed columns fail. The disadvantage of analytical method is that we cannot see exact stresses during design, so the chances of over and under design is high in analytical methods. This is one of the major reasons for developing a firm solution through this research paper. Also there is no firm fem based design procedure available in industries to follow. The code rules like ASME SECVIII DIV-I, ASME DIV-II, ASCE, IS-875, and IS-1893 are used and the allowed stresses to determine the adequacy of this design within every required loading conditions are learnt and presented. Achieved outcomes are acceptable along with the prerequisite of international standards and codes and current industry practices. FEM was redone and found that the column is safe with is to be check various shell and skirt thickness.

Keywords

Dead Weight, Earthquake, Empty Vessel, Pressure, Static Test Pressure, Static Pressure, Test Pressure, Vessel Dead Weight, Wind

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A. M. Senthil Anbazhagan ¹, M. Dev Anand ¹

Affiliations
1 Department of Mechanical Engineering, Noorul Islam Centre for Higher Education, Kumaracoil - 629 180, Thuckalay, Kanyakumari District, Tamilnadu State, IN

Abstract

Background/Objectives: Saddles are one of the important parts of vessel as they support the vessel. In this study, how Mode II type crack propagated inside the junction of saddle and vessel connection would spoil the entire setup of the vessel was investigated. The main intention of this work was to avoid the repeated failures of saddles during operation in energy development industries and wherever it is used. Methods/Statistical Analysis: Two different types of saddles were considered and fabricated using IS2060 Grade B material. The saddle parts were welded as per the code rule of API. Findings: Normally, welding in inclined saddle is difficult in comparison with straight saddle. This may be reason; the failure rate of inclined saddle is high in comparison with straight saddles during operation and loading conditions. The other possibility of failure is the gap formation inside the weld during joining the plates. This is due to non-deposition of weld materials. The gap would grow during operation and loaded conditions. To avoid these types of failures, external and internal crack inspections were done. Once the inspection was done, it was examined the load carrying of the fabricated saddles using FEM. Then the solid works software was used to simulate the solid model which it’s developed similar like original saddle fabricated for estimating the load carrying capacities. The obtained results of NDT and FEM were presented and the design recommendations based on investigation and study are also suggested. Applications/Improvements: The obtained results of NDT and FEM were presented and the design recommendations based on investigation and study are also suggested.

Keywords

Pressure Vessels, Saddles Finite Elements, Inspection, Support Structure.

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