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Keywords: fatigue life
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Proceedings Papers

Publisher: Offshore Technology Conference
Paper presented at the Offshore Technology Conference, May 2–5, 2022
Paper Number: OTC-31949-MS
... acoustic modes in the pipe and structural mode frequencies. This paper takes this notion further, translating the structural modes into a predictable fatigue life using S-N curves. A typical AIV broadband excitation level can range anywhere between 100Hz – 3000Hz. Modal analysis of the pipework near...
Proceedings Papers

Publisher: Offshore Technology Conference
Paper presented at the Offshore Technology Conference, May 2–5, 2022
Paper Number: OTC-32068-MS
... and the resultant casing collapse failure, and 2) casing fatigue. These cyclic loads to the casing structure often result in detrimental fatigue failures at essential casing joints and welds. Wrong cyclic strain calculations will lead to false estimation of casing fatigue life. This, in turn, would lead to abuse...
Proceedings Papers

Publisher: Offshore Technology Conference
Paper presented at the Offshore Technology Conference, May 2–5, 2022
Paper Number: OTC-31850-MS
... & offloading inspection strain gauge fatigue damage probability time series reconstruction fatigue life standard deviation spectrum Background Inspections of offshore assets may be an expensive process. Costs are related to planning, mobilization, inspection, and impact on operations...
Proceedings Papers

Publisher: Offshore Technology Conference
Paper presented at the Offshore Technology Conference, May 2–5, 2022
Paper Number: OTC-31717-MS
... analysis digital twin wellbore design information mooring integrity management subsea system mooring system mechanical engineer international conference case study external environmental condition offshore technology conference fatigue life inspection data template Introduction...
Proceedings Papers

Publisher: Offshore Technology Conference
Paper presented at the Offshore Technology Conference, May 2–5, 2022
Paper Number: OTC-31725-MS
... for the FPSO, utilized during the design phase, were non-conservative when compared to the real case, which led to under design of risers' fatigue life. In-loco verification of some equipment integrity revealed damages, probably related to fatigue associated with corrosion. Improvements on the existing system...
Proceedings Papers

Publisher: Offshore Technology Conference
Paper presented at the Offshore Technology Conference, May 2–5, 2022
Paper Number: OTC-32022-MS
... fatigue mitigation. It was found that a longer riser or a flatter arch gives higher slugging fatigue lives. Higher arch flatness alleviates long period slugging, which drives the slugging fatigue due to integral effect over the lower catenary, and increases fatigue life. Another interesting finding...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-31109-MS
...Abstract Abstract Subsea production systems have been using API-specified methods and detection criteria for nondestructive examination (NDE) for equipment up to 15,000-psi rated working pressure. With higher pressure requirements and use of methods for evaluation of the fatigue life of HPHT...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-31165-MS
... to as Flared Thickened Ends (FTEs) improves the fatigue life of SCRs and welded connections in general. This novel assembly has many advantages. It overcomes the thickness limitation of welding traditional upset ends and reduces offshore welding time, cost, and risk. When FTEs are used in simple SCRs...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-31047-MS
...Abstract Abstract Subsea wellhead systems have a design fatigue life that is expected to withstand the damage incurred from stress caused by cyclic loading during its operation. Wellhead fatigue is a critical factor when drilling offshore wells because the condition of the wellhead determines...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-31037-MS
... method can reduce the stress at the touchdown zone (TDZ) within acceptable limits and improves fatigue life when compared to a Steel Catenary Rigid (SCR). The state-of-art concept eliminates the necessity of buoys in a SLWR concept. Further, there will be saving in installation time, this combined...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-31282-MS
... evaluation will be discussed. This will highlight the current assumptions and unknowns in data that can form the subject of evaluation for a future joint industry study. subsea system modeling refinement operation outer barrel auxiliary line viv fatigue life fatigue damage upstream oil & gas...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-31252-MS
... porosity hip vessel modern hip system pressure vessel furnace offshore technology conference hiping fatigue life microstructure Introduction The oil and gas industry trend to place more stringent regulations and requirements on projects has driven increased demands of disciplines...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2020
Paper Number: OTC-30814-MS
... that mean tension significantly impacts chain fatigue and thus whole mooring system fatigue life. Fatigue is a significant challenge for riser design due to tension and bending. The hangoff and touchdown zones are usually the most fatigue critical areas for risers as well. Similar to the mooring design...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29449-MS
... JIP is to investigate methodologies for assessing remaining fatigue life of the corroded mooring chain used for floating production systems. The JIP scope includes fatigue testing in labs and finite element analysis (FEA) of corroded chain samples retrieved from six floating production facilities...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29455-MS
... in the pipeline system. fatigue life artificial intelligence digital twin model data analytic neural network data-driven model pipeline system conceptual design maintenance sensor data machine learning predictive maintenance maintenance strategy maintenance schedule subsea pipeline upstream...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29534-MS
... Abstract Subsea equipment covered by the API Spec 17 subcommittee has had limited focus on assessing fatigue life because of external environmental loads using traditional analysis methods. With the current trend of high-pressure, high-temperature (HPHT) development, the industry is migrating...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29223-MS
... limitations in current standards when calculating the fatigue capacities of non-preloaded connectors with different interacting component materials (i.e. low alloy steel and nickel based alloys). The methodology considers the effect on the fatigue life of both non-axisymmetric geometry/loading, FAT loading...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29338-MS
... safety factor upstream oil & gas assessment requirement wire rope strength ground chain inspection metocean data subsea system installation upper wire fpso fatigue life life extension project extension mooring system corrosion riser wire oil field Presentation of OTC-29338-MS...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29471-MS
... and corrosion seal failure fatigue life tubular connection well integrity flowline corrosion amplitude mpa pipeline corrosion premium connection riser corrosion makeup shoulder interference lap upstream oil & gas selection subsurface corrosion Presentation of OTC-29471-MS Presentation...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29488-MS
... technique is investigated. Its remaining fatigue life is obtained by simulating fatigue crack growth, under two sets of residual stresses generated by different mandrel diameters. The results are then compared to the crack arrest hole (CAH) approach. Through these case studies, XFEM shows adequacy for FFS...

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