Integrating First Principles-Based Approaches into the Routine Design Practice for Offshore Consequence Analysis and Operational Troubleshooting Assessments

Abstract

Abstract Significant advancements in physics-based model development, software workflow practices, multi-core processing and cost-effective cloud computing has enabled the adoption of high fidelity, three-dimensional (3D) modeling such as computational fluid dynamics (CFD), finite element analysis (FEA), and other first principles-based analyses into normal engineering design practices. Historically, integration of these tools into the standard engineering workflow was challenging due to the excessively long turnaround times to deliver any results. Three Case Studies are subsequently presented where 3D modeling analysis was used early and seamlessly in the engineering design process to solve problems related to consequence analysis and equipment operational performance: Case 1) Risk assessment of pilot flame extinguishment due to inert gas discharge from the flare of an FPSO, Case 2) Jet dispersion analysis from HP/LP flare to assess hydrocarbon and H2S concentrations at critical locations on the platform, including results comparison between CFD results and a conventional dispersion tool – Flaresim, and, Case 3) Solving a fatigue induced cracking problem on the cooling water circuit of a heat exchanger using an integrated workflow consisting of CFD modelling of the cooling water, stress analysis using FEA, and structural integrity assessment per ASME BPVC VIII Division 2. The modelling results from these case studies were generated in timeframes similar to those using conventional engineering calculation methods, and thus allowed for prompt integration into the engineering design process without impacting project schedules and delivery. Moreover, the costs to perform these modelling analyses were not substantially greater than the costs associated with conventional calculation methods, thereby providing high value to the engineering projects.