Comparison Case Study of Risk Assessment of Dropped Objects on Subsea Pipelines
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 12, Issue 3
Abstract
Det Norske Veritas is a company that gives an available classification guidance, which can provide a systematic methodology to estimate the risk due to dropped objects for the purpose of subsea pipeline projection. Firstly, dropped objects simulator (DROBS), which has been developed based on the motion dynamics of cylindrical objects, can be used to calculate the hit probability within a ring area. These results will be compared with the results from DNV’s simplified methodology. Further, they can also be integrated into DNV’s methodology to calculate the annual failure frequency. It is found that DNV may underestimate the failure frequency if compared with the results from DROBS. Three different shield plans are proposed, with 0–60, 0–80, 0–90 m shielded, respectively, to quantify the differences between both methods. In each shield plan, there will be six cases discussed, three for long/flat-shaped objects and the other three for box/round-shaped objects. Through this comparison case study, it is found that only Shield plan III can meet the design criteria base on the original layout design; however, an optimal layout design with a lower cost is also proposed. Overall, the outcome of this study can help optimize offshore pipeline layout design eventually. DOI: 10.1061/ (ASCE) PS.1949-1204.0000569. © 2021 American Society of Civil Engineers.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request, including the inputs and outputs of DROBS.
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Information & Authors
Information
Published In
Journal of Pipeline Systems Engineering and Practice
Volume 12 • Issue 3 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Aug 19, 2020
Accepted: Mar 3, 2021
Published online: May 26, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 26, 2021
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