Numerical analysis and preliminary design of topside of an offshore platform using FGM and X52 steel under special loads
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TECHNICAL PAPER
Numerical analysis and preliminary design of topside of an offshore platform using FGM and X52 steel under special loads Srinivasan Chandrasekaran1 · S. Pachaiappan1 Received: 3 May 2020 / Accepted: 7 July 2020 © Springer Nature Switzerland AG 2020
Abstract This study investigates the behavior of the topside of an offshore platform under hydrocarbon explosion and wind. Topside is designed for a combination of loads arising from types of equipment, fixed and rotating machinery, and cranes, apart from the gravity loads. While the wind loads are calculated using a gust factor and applied at different levels of the deck, a preliminary analysis is carried out using SAP2000 nonlinear. The design check carried following the code confirmed that the chosen sections satisfy the design requirements, both in strength and serviceability criteria. The topside of a typical offshore platform is highly vulnerable to fire and hydrocarbon explosion, causing extreme pressure and temperature in the confined areas. Pressure caused by the hydrocarbon explosion is rapid and results in an impulsive force of short duration. It damages the structural components and affects the overall performance of the topside considerably. The blast load is applied as an overpressure on the beams and columns and analyzed using ABAQUS explicit. The current study investigates the structural adequacy of members, constructed with X52 steel and functionally graded material (FGM). A comparison of the results showed that FGM offers more resistance to the displacement of beams and columns. Under the action of blast overpressure, members with FGM showed a significant reduction in both the plastic stain and Von-Mises stress at the beam–column connections in comparison with that of X52 steel. Keywords Special loads · Hydrocarbon explosion · FGM · X52 steel · Blast load
Introduction The topside of an offshore platform is designed to serve the exploration, production, and processing of oil and gases. They consist of a multi-tier deck, several housing modules for drilling, accommodation, manufacturing, and processing. Processing module includes seawater intake system, water-injection system, heat exchanger, dehydration unit, gas compression unit, produced-water treatment system, de-salter unit, and production separators [1–3]. These operations require many utilities, including fire-fighting, power generators, chemical-injection systems, flaring and venting systems, drainage, and sewage systems [4, 5]. Therefore, the topside of a typical offshore platform is complicated * Srinivasan Chandrasekaran [email protected] S. Pachaiappan [email protected] 1
Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600036, India
with equipment, cable trays for electrical and plumbing, fixed machinery, and others [6, 7]. Oil and gas exploration increases the probability of a hydrocarbon explosion of the topside, which results in extreme temperature, and pressure on the structural elements; moreover, the intricate geometri
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