Engineering Critical Assessment for Offshore Pipeline with Semi Elliptical Surface Cracks in Girth Weld – Comparison of FEM and BS۷۹۱۰ Guideline

Publish Year: 1397
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_IJMTE-10-1_005

تاریخ نمایه سازی: 23 بهمن 1400

Abstract:

Economical design with sufficient fracture resistance is of high importance in any offshore pipeline projects. Using an Engineering Critical Assessment (ECA), alternate acceptance criteria for pipeline girth weld inspection can significantly reduce the cost of constructing of offshore oil and gas pipeline by minimizing unnecessary repairs. Offshore pipelines consist of short pipeline segments connected by girth welding method. Surface and embedded elliptical cracks due to welding operation are often observed at welding zone which pose a potential threat to the reliability of the offshore pipelines. To derive the acceptance criteria for pipeline girth weld defects and pipeline safety during installation and operation phase, an ECA based on fracture mechanics is required. In this paper, ECA of offshore pipeline with semi elliptical surface crack under pure tension loading is performed according to finite element method and BS۷۹۱۰ guideline. Moreover, a comparison between these two methods is offered. It is concluded that, ECA by BS۷۹۱۰ guideline is more conservative than finite element method, and the difference between the two diagrams increases as strain levels are increased. Also, comparisons of critical crack size curve for various strain levels are studied.

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Authors

Mohammad Hossein Sharifi

Faculty of marine science, Petroleum University of Technology, Mahmoudabad, Iran

Reza Soheili

Science and Research Branch, Islamic Azad University, Tehran, Iran

Ali Shaghaghi Moghaddam

Department of Mechanical Engineering, Islamic Azad University, Takestan Branch, Iran

Farhood Azarsina

Department of Marine structure, Science and Research Branch, Islamic Azad University Tehran, Iran

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