PSI - Issue 57

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 57 (2024) 692–700

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers Abstract This article presents the Risk-Based Inspection methodology, as described in DNV-RP-C210, and demonstrates its application in establishing inspection plans for Floating Production Storage and Offloading (FPSO) vessels. Unlike traditional sailing ships, FPSOs are designed for operation at a single location throughout their lifespan, necessitating effective control of structural integrity to ensure continued operation. This paper emphasizes the importance of balancing structural and operational aspects during inspection campaigns, especially for structural details located inside difficult-to-access storage and ballast tanks. To establish inspection plans for FPSOs, probabilistic analyses are performed, considering uncertainties in cyclic loading, fatigue capacity, environmental factors, and inspection quality. The paper emphasizes the importance of consistent fatigue analyses that enable accurate predictions of fatigue crack locations and directs inspections to hot spots where cracks are most likely to occur. The implementation of inspection plans for FPSOs involves campaign-based strategies to efficiently evaluate numerous structural details. Balancing comprehensive inspections with operational challenges is crucial, and careful planning and scheduling are required to minimize disruptions to routine operations. The paper underscores the significance of optimized inspection resources, practical inspection procedures, and a balanced approach that ensures thorough inspections while minimizing the impact on FPSO operation. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers Keywords: Fatigue; inspection planning, non-destructive testing; RBI; FPSO Fatigue Design 2023 (FatDes 2023) Probabilistic inspection planning for fatigue cracks in floating production, storage, and offloading units Arne Fjeldstad* and Frode Bratbak DNV, Veritasveien 1, Høvik 1363, Norway

* Corresponding author. Tel.: +47 99630086. E-mail address: arne.fjeldstad@dnv.com

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers 10.1016/j.prostr.2024.03.075