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Ocean Systems Engineering
  Volume 9, Number 2, June 2019 , pages 135-155

Reliability sensitivity analysis of dropped object on submarine pipelines
Sina Taghizadeh Edmollaii, Pedram Edalat and Mojtaba Dyanati

    One of the safest and the most economical methods to transfer oil and gas is pipeline system. Prediction and prevention of pipeline failures during its assessed lifecycle has considerable importance. The dropped object is one of the accidental scenarios in the failure of the submarine pipelines. In this paper, using Monte Carlo Sampling, the probability of damage to a submarine pipeline due to a box-shaped dropped object has been calculated in terms of dropped object impact frequency and energy transfer according to the DNV-RP-F107. Finally, Reliability sensitivity analysis considering random variables is carried out to determine the effect intensity of each parameter on damage probability. It is concluded that impact area and drag coefficient have the highest sensitivity and mass and add mass coefficient have the lowest sensitivity on probability of failure.
Key Words
    submarine pipeline; dropped object; probabilistic assessment; sensitivity analysis
Sina Taghizadeh Edmollaii, Pedram Edalat: Department of Offshore Engineering, Petroleum University of Technology, Mahmoudabad, Iran
Mojtaba Dyanati: The University of Akron, USA

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