Modelling the influence of hydrocarbon fire on offshore topside

Due to the handling of flammable materials, offshore oil facilities are at risk of fire, endangering crew and structure. This study aims to predict fire load and structural response, focusing on a hydrocarbon fire on an offshore platform in the Gulf of Mexico. Simulations were conducted in sections due to the platform’s size, with fire load estimated for the considered fire scenario. The fire dynamic simulator (FDS) using PyroSim, a CFD tool, was used to estimate time-temperature curves, with mesh size determined by a convergence study and wind effects considered. The FDS simulation data was input into Abaqus for a detailed structural response analysis. A heat transfer analysis simulated node temperatures during fire exposure, followed by a structural analysis considering high-temperature material properties. The structural response at critical points was observed and discussed. The discussion revolves around the fire rating derived from the study’s results.