Risk Assessment Of Offshore Platform And Peripheral Installation Due To Collision Damage

Offshore platforms work in complex and harsh environments, in addition to normal work load, environment loads, also threatened by accidental loads, such as the impact of ships, impact of dropped objects. Major disaster caused by accidental loading will not only result in casualties and major economic losses, but also the surrounding coastal environment and marine ecosystem caused by pollution and destruction. The offshore platform risk assessment carried out relatively small In Engineering applications of China, the current offshore platform design, the accidental loads most did not take into account. The most common practice is to maintain after be delivery platform, it will certainly waste a lot of manpower and financial resources. So it is essential to analyze and assess the behaviors of platform subjected to the accidental loading. However, very little statistical data on the disaster of offshore platform for the nascent field of ocean engineering, it has made it difficult to Quantitate the risk, In addition to the complex mechanical mechanism of the ocean structures damage caused by the collision, coupled with the complexity of the marine environment, high cost of pilot studies, and does not identify many factors, in this case, finite element numerical simulation has more and more attention In the field of collision analysis.This paper started on the basis of the project of "LD32-2PSP quantitative index for assessing and recognizing the safety of major hazard" entrusted by China National Offshore Oil Corporation (CNOOC) (China) Co., Ltd. Research focus on combining theory and engineering practice, on the basis of the in-depth research on the risk analysis method and on structural collision damage, offshore platform collision risk quantitative assessment system to achieve the risk assessment of offshore platforms from the traditional experience to scientific prediction type. The main contents and findings include the following:1. Based on Searching and Reviewing a large number of both Domestic and foreign Literature high-risk industries research data, it is to analyze domestic and foreign marine structure impact of risk assessment status, and is to explore the various risk analysis methods and the advantages and disadvantages of the application for further risk quantitative assessment of offshore platform subjected to collision.2. The methods to analyze offshore platform structure collision damage are introduced, including the empirical formula, energy method and the finite element method. The finite element model of LD32-2 PSP Platform is established by explicit dynamic. Dynamic Response and damage of the offshore platforms structure, Deck equipment pipeline caused by falling objects. Dynamic Response and damage of the offshore structure and the riser due to the ship impact at different speeds, and the overall damage of the platform structure was assessed.3. The analysis framework of offshore platforms in the risk of accidental loads is established, using the risk assessment methods. According to the probability of accidental disasters and platform exposure level to divide the risk levels of disaster. The risk analysis of LD32-2PSP Platform was carried out according to the risk levels. The structural quantitative risk assessments from the falling objects and ship impacts are carried out based on the calculated risk of collision frequency and the extent analyzed Structural damage. The result can provide the analysis method and the theoretical basis for the protection the overall security of offshore platform structures in the occasional hazards.4. On the basis of risk assessment, measures are proposed to reduce the risk of falling objects and ship collision risk.