Results 161 to 170 of about 807 (207)

Fatigue Testing of Used Mooring Chain

Volume 1: Offshore Technology, 2017
In Statoil mooring chains have been inspected since the first floaters were installed in the 1990’s, and replacement of top chain started as early as year 2000. Background for replacement has been wear, surface corrosion, end of design fatigue life and check of condition for lifetime extension evaluation.
Øystein Gabrielsen, Kjell Larsen, Svein-Arne Reinholdtsen   +2 more
openaire   +1 more source

Fatigue Assessment of “Corroded” Mooring Chain

Volume 3: Structures, Safety, and Reliability, 2019
Abstract Assessment of corroded mooring chain for continued service is a challenging task faced by industry. Current best practice relies heavily on qualitative inspection information collected during inspection campaign. There has been little investigation into this practice and whether it is an appropriate technique or can be improved.
David A. Baker, Zhen Li, Sue Wang, Xiying Zhang, Yunliang Shao, Harry Li, Xiaoqin Zhan, Linfang Zhu, Xing (Terry) Tao   +8 more
openaire   +1 more source

Strength Assessment of Degraded Mooring Chains

Offshore Technology Conference, 2017
Abstract This paper presents a framework for strength assessment of degraded mooring chains, based upon laboratory break tests and finite element simulations of degraded chain. Four different modes of degradation, all observed in the field, are considered including: 1) general corrosion, 2) localized corrosion with large single and dual ...
Justin Crapps, Haiping He, David Baker, Subir Bhattacharjee, Sai Majhi, Erik Wilutis   +5 more
openaire   +1 more source

Behaviour of Embedded Mooring Chains in Clay During Chain Tensioning

Offshore Technology Conference, 1989
ABSTRACT With the help of experimental results, this paper first describes the behavior of embedded mooring chains connected to a buried anchor point. The tests were carried out on three different sizes of chain in two clays with different undrained shear strengths. Subsequently, the effect of changing the effective
A. Dutta, G. Degenkamp
openaire   +1 more source

Coastal mooring design: taut elastomeric and chain catenary surface buoy moorings

Oceans '99. MTS/IEEE. Riding the Crest into the 21st Century. Conference and Exhibition. Conference Proceedings (IEEE Cat. No.99CH37008), 2003
A comparison is made of the behavior of a buoy anchored with an elastomeric tether and a chain catenary mooring at the same water depth and under the same environmental conditions. The results include numerical predictions of the statics and dynamics of the two moorings under identical ocean current and sea state forcing.
W. Paul, J. Irish, J. Gobat, M. Grosenbaugh   +3 more
openaire   +1 more source

On Eilenberg-Moore algebras induced by chains

Algebra Universalis, 1999
Given a fixed topological space, consider the monad \(\mathbb{T}_S\) on \({\mathcal S}et\) determined by the contravariant \(\text{hom}\) functor of \(S\) and its adjoint \((-)^S\). The Eilenberg-Moore category of \(\mathbb{T}_S\) has been determined by Linton for the Sierpiński dyad and by \textit{R.-E. Hoffmann} for all spaces of cardinality \(\leq 2\
openaire   +3 more sources

Failure of Chains by Bending on Deepwater Mooring Systems

Offshore Technology Conference, 2005
Abstract Following the unexpected rupture of chains in the chainhawse of the Girassol buoy after only half a year of service a new bending fatigue mechanism of failure has been identified for mooring systems with high pretensions.
P. Jean, K. Goessens, D. L'Hostis
openaire   +1 more source

Risk-Based Inspection Planning for Mooring Chain

Journal of Offshore Mechanics and Arctic Engineering, 2002
The use of risk-based inspection planning for offshore structural components is becoming quite familiar. This paper describes an application of this technique to mooring chain. In many cases, the technique is based on probabilistic modelling of fatigue crack growth in the structural components, and updating of the failure probability on the basis of ...
Jan Mathisen, Kjell Larsen
openaire   +1 more source

Analytical Models for Mooring Chain-Soil Interaction

Journal of Offshore Mechanics and Arctic Engineering, 1999
For most catenary mooring systems, a quite long part of the line is resting on the bottom, even in extreme situations. Hence, a good design of the anchor requires an accurate prediction of the loading from the anchorline, including any soil-chain interaction.
K. Larsen, G. Svano̸
openaire   +1 more source

Mooring Chain Breakage on GoM Platform

Offshore Technology Conference
Abstract In 2023 a mooring chain breakage was discovered at the Titan platform in US waters in the Gulf of Mexico. Chain links, including the broken link, were then brought to shore for investigation. Hurricane Ida, which passed directly over the Titan platform in August 2021, is identified as the likely event starting the critical crack,
Øystein Gabrielsen, Duncan Brown, Lars Rønning   +2 more
openaire   +1 more source