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http://dx.doi.org/10.5574/KSOE.2017.31.3.233

Design of Subsea Manifold Protective Structure against Dropped Object Impacts  

Woo, Sun-Hong (Department of Naval Architecture and Ocean Engineering, Inha University)
Lee, Kangsu (Offshore Plant Research Division, Korea Research Institute of Ships & Ocean Engineering)
Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
Publication Information
Journal of Ocean Engineering and Technology / v.31, no.3, 2017 , pp. 233-240 More about this Journal
Abstract
Subsea structures are always vulnerable to accidental risks induced by fishing gear, dropped objects, etc. This paper presents the design of a subsea manifold protective structure that protects against dropped object impacts. Probable dropped object scenarios were established considering the shapes and masses of the dropped objects. A design layout for the manifold protective structure was proposed, with detailed scantlings and material specifications. A method applicable to the pipelines specified in DNV-RP-F107(DNV, 2010) was applied to calculate the annual probabilities of dropped objects hitting the subsea manifold. Nonlinear finite element analyses provided the structural consequences due to the dropped object impacts such as the maximum deflections of the protective structure and the local fracture occurrences. A user-subroutine to implement the three-dimensional fracture strain surface was used to determine whether local fractures occur. The proposed protective structure was shown to withstand the dropped object impact loads in terms of the maximum deflections, even though local fractures could induce accelerated corrosion.
Keywords
Subsea manifold; Protective structure; Dropped object; Hitting probability;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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