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Keywords: return period
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Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2023
Paper Number: OTC-32195-MS
... study) model using updated loading and code check approaches. The original study used a 50-year return period design storm event and the working stress design (WSD) approach. A more modern design assessment would use the load resistance factor design (LRFD) with a 100-year return period storm event...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-30940-MS
... return period values of the parameters. Boundary conditions for the simulations are extracted from Grand Isle and Port Fourchon sea level observations, and from FEMA and the Water Institute of the Gulf simulations. Port Fourchon site should be subject to flooding for 10-year return period conditions...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2018
Paper Number: OTC-28850-MS
... Stability Analyses The stability of the rock mass shall be assessed for all relevant return period of the seismic action. A fair number of scenarios shall be considered in order to capture the seismic hazard of a given area. The following set of return periods is recommended: 100 yrs, 475 yrs, 2475 yrs...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2018
Paper Number: OTC-29024-MS
... requirement installation allowance guideline chain link corrosion mooring system consideration api rp2sk subsea system guidance iso 19900 api rp 2sk offshore structure upstream oil & gas return period artificial intelligence API RP 2SK , " Design and Analysis of Stationkeeping...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27640-MS
... 2MET. crest conundrum upstream oil & gas water depth crest elevation simulation negative conundrum correction n-year wave wave height guidance design wave approach conundrum stream function wave n-year crest loading return period crest wave period design wave...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27734-MS
... of the environmental conditions is specified. The return period of the characteristic line tension should, hopefully, correspond reasonably well to the return period of the environmental conditions, but this is not known either. Thus, there is a need to study more closely todays mooring regulations and check whether...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27773-MS
... Yes * 100-year return period for one environmental parameter (wave, wind or current) and associated values for the other two. 10-year return period for one environmental parameter (wave, wind or current) and associated values for the other two.Note that for mobile units 5 year is accepted when...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27520-MS
... for the strength and fatigue assessment of the risers and wellhead/casing systems. The profiles for different return periods (i.e., N = 1, 10, 100, etc.) are derived from an extreme value analysis (EVA) of the available data. The traditional derivation of N-year profiles is based on the parametric EVA...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27699-MS
... Return Period (RP) events, and accounting for other degradation mechanisms unrelated to long RP events but, based on experience, were root causes of many failures. The "if in doubt, make it stout," philosophy is critically examined against a higher fidelity approach, utilizing new knowledge of reported...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27697-MS
.... and Stiff , J. , " Metocean Return Period Required for Mooring during Cyclone Season ", OTC 20144, Offshore Technology Conference , 2009 . Potts , A. , Chaplin , C. , and Tantrum , N. , " Factors Influencing the Endurance of Steel wire Ropes for Mooring Offshore Structures ", OTC 5718...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27870-MS
... or conservatism as the renewable industry moves forward with the installation of offshore energy converters. anchor mec consequence class ocean energy tidal current offshore technology conference oil and gas renewable energy selection return period application installation requirement anchor...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-27089-MS
... by wind and central pressure values. From these historical databases wind and wave maxima are subjected to extrapolation in logarithmic space. In order to correctly evaluate the required return period (up to 1 on 10,000 years) extrapolating the tail of the distribution from historical database provides...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-27213-MS
...-2 and the more recent API adoption, RP2EQ, provide performance-based recommendations for selection of a two-level seismic design. At the first level the structure is designed to retain its full capacity (and likely its operability) at ground motions with a return period typically under 200 years...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2015
Paper Number: OTC-26035-MS
... of design criteria, including environmental conditions return period (and other parameters) as well as safety factors for WEC moorings has not yet evolved into a standard procedure. This paper contrasts the mooring system characteristics that are found for some typical WEC moorings when their design...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2014
Paper Number: OTC-25108-MS
... dynamic analysis for various return periods and loading directions, a regression model is used to develop the probability distribution of the conditional probabilities of failure under each return period and estimate the annual probability of failure of the mooring system. This simplified method decouples...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2014
Paper Number: OTC-25160-MS
... gravity flow. Using these models, the probability of a mass gravity flow impacting the seafloor installation(s) should then be computed for all relevant scenarios and return periods in order to derive the annual or lifetime probability. However, analyzing all possible scenarios and return periods could...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2013
Paper Number: OTC-24024-MS
... pod mode drilling riser scatter diagram return period extreme current profile current profile upstream oil & gas probability fatigue analysis current speed pod coordinate orthogonal decomposition riser surface current speed extreme profile accuracy current speed magnitude...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2012
Paper Number: OTC-23202-MS
... environmental loads (i.e. 1 Year Return Period, 10 Year Return Period, Extreme or Storm Event), vessel loads (i.e. vessel moving downstream or upstream from the well-site from -10% to +10 % of water depth (- 400 meters downstream to + 400 meters upstream) and drilling loads (seawater with 1.03 Specific...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2012
Paper Number: OTC-23440-MS
.... return period floating production system fpso platform design offshore technology conference life safety limit state hurricane offshore facility upstream oil & gas requirement design practice performance expectation hazard curve loading subsea system safety design condition...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2012
Paper Number: OTC-23406-MS
... are considered. Parametric study of the correlations between the responses of turbine support structures and the main design parameters including return period of design environmental conditions, normal and abnormal turbine operating modes, misalignment between wind and wave directions, hurricane wind models...

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