Investigation of the Effect of Local Buckling and VIV Fatigue on Failure Probability of Subsea Pipelines in Iranian South Pars Gas Field | Zendy

Abdolrahim Taheri | Zendy; Mahdi shabani | Zendy; Mohammad Daghigh | Zendy

Open Access

Investigation of the Effect of Local Buckling and VIV Fatigue on Failure Probability of Subsea Pipelines in Iranian South Pars Gas Field

Author(s) -

Abdolrahim Taheri,

Mahdi shabani,

Mohammad Daghigh

Publication year - 2018

Publication title -

international journal of maritime technology

Language(s) - English

Resource type - Journals

eISSN - 2476-5333

pISSN - 2345-6000

DOI - 10.29252/ijmt.9.23

Subject(s) - subsea , buckling , pipeline transport , structural engineering , natural gas field , field (mathematics) , engineering , marine engineering , mathematics , mechanical engineering , natural gas , pure mathematics , waste management

Article History: Received: 5 Aug. 2017 Accepted: 8 Jan. 2018 Free-span occurs normally in a pipeline at uneven seabed, dynamic seabed and pipeline crossing. Free spanning in pipeline causes Vortex Induced Vibration (VIV) fatigue, fracture and bursting. In this paper, a pipeline located in South Pars Gas Field is assessed against local buckling and VIV fatigue using probability of failure theory based on the recommended methodology by Det Norske Veritas (DNV) corresponding to different soil classes and different span length to pipeline diameter and also different water depths by applying First-Order Reliability Method (FORM) and Monte-Carlo Sampling (MCS), separately. Furthermore, the simultaneous effect of local buckling and VIV fatigue is assessed in terms of probability of failure. Finally, in order to determine the effect of each parameter on failure probability, sensitivity analysis is carried out using the alpha index.

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