Pre-FEED 단계에서 개념적 화재 & 폭발 위험도 평가를 위한 기반 모델 개발

Abstract

The offshore platforms have a number of equipment in process area. This process area faces a high probability of hydrocarbon fire accident because most of equipment are contained the flammable oil and gas circumstances. Therefore, the fire risk analysis is an essential safety study which should be considered in the whole development phases of an offshore platform installation. Based on the information at each development phase and level of data, the fire risk analysis results are reflected into the design with increasing the level of accuracy. However, the results of fire risk analysis considering the initial process data and layout data are conservative because most of fire risk analysis is performed under assumptions and insufficient input data in pre-FEED stage. There is a need for a way to develop an integrated system to overcome the problems of the existing fire risk analysis method. The scope of this study is to develop the integrated system, which is required to respond with the data quickly from process design and improve FRA results in pre-FEED stage. This system is named as Integrated Fire & Explosion Conceptual Risk Analysis (IFECRA) system. The basis of the fire risk analysis input data is defined from the process and layout information, and this study proposes the standard data transfer sheet. In addition, this study develops the modules which calculate the leak frequency automatically and generate a simplified 3D model. Therefore, the IFECRA is able to work with 3D fire CFD simulation using a 3D simplified model. Furthermore, the fire risk analysis module develops to determine the failure of critical targets and the rate of passive fire protection based on the design accidental loads. Using the developed IFECRA system, the fire risk analysis is automatically calculated, and the design effect zone is obtained from the both CFD model and analytical model fire simulation results. Quantitative comparison between the failure of critical targets and the rate of passive fire protection are done by employing the design effect zone. For results of the fire risk analysis, it is confirmed that the risk analysis results using the IFECRA system have relatively accurate compared to the existing fire risk analysis method.