Results 211 to 220 of about 993 (264)

Submarine Pipeline Trenching by Multipass Ploughs

Offshore Technology Conference, 1985
ABSTRACT A major development program for large ploughs to trench submarine pipelines began in 1975, and has led to the construction of 13 ploughs, which have been used in many parts of the world. Deep trenches are best cut in a sequence of separate passes.
R.J. Brown, A.C. Palmer
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Hydraulic Trenching of Submarine Pipeline

Transportation Engineering Journal of ASCE, 1971
A consortium of oil companies commissioned two firms of contractors to construct, as a joint venture, a single buoy mooring system off the South African coast. It was planned to pull the pipes out to the sea through a sleeve to be placed in a trench blasted 600-ft rocky reef in the surf zone, and to bury the pipe on the seaward side of the reed between
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Concrete coating for submarine pipelines

Magazine of Concrete Research, 1982
Synopsis A submarine pipeline is usually externally coated with reinforced concrete, the function of which is to protect the corrosion coating against impact damage, and give the pipe additional weight to stabilize it on the sea bed. There are unusual requirements in design and application technology. The paper examines the current state of knowledge
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Three-Dimensional Scour at Submarine Pipelines

Journal of Hydraulic Engineering, 2012
This paper presents results of an experimental study on three-dimensional scour at submarine pipelines with uniform sediment under a unidirectional current in clear-water conditions. The data show that propagation of the scour hole in the transverse direction of flow may be divided into a rapid and a slack phase of development.
Yushi Wu, Yee-Meng Chiew
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Design Criteria for Submarine Pipeline Crossings

Journal of the Hydraulics Division, 1973
This laboratory investigation of pipeline crossings of alluvial streams shows that the rate of scour above the pipe varies as the dimensionless shear stress which is a function of the grain size, the energy slope, and the hydraulic radius. The dimensionless shear stress is used to determine the depth of scour that will occur for various flood ...
David R. Townsend, Donald W. Farley
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Buckle Propagation Pressure for Submarine Pipelines

Journal of Offshore Mechanics and Arctic Engineering, 1993
A new analytical expression is proposed for the prediction of the buckle propagation pressure for deepwater offshore pipelines. The expression accounts for the influences of the main factors involved, including the effects of material and geometrical nonlinearities. Predictions of the proposed expression are shown to be in good agreement with available
G. D. Hahn, M. She, J. F. Carney
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Optimum Design of Submarine Suspended Pipelines

Journal of Energy Resources Technology, 1985
Almost all submarine pipelines are currently laid on the sea floor. This practice is inherently expensive and the system is difficult to maintain and has a high possibility of excessive bending stress. The concept of suspending a pipeline under the ocean surface is investigated in the reported study.
Z. Huang, A. Seireg
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Wave Force Coefficients for Submarine Pipelines

Journal of Waterway, Port, Coastal, and Ocean Engineering, 1988
Wave‐induced forces on a submarine pipeline in regular waves placed near a plane boundary were studied in the inertia‐drag regime. The in‐line root mean square (rms) coefficient was computed using Morison equation and linear wave theory. A Fourier analysis was carried out on transverse forces and nth harmonic transverse rms coefficients were evaluated.
Jothi Shankar, N., Cheong, Hin-Fatt, Subbiah, K.   +2 more
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Leakage from Ruptured Submarine Oil Pipeline

Journal of Transportation Engineering, 1985
The rupture of a submarine oil pipeline gives rise to various mechanisms leading to an oil spill. Among these mechanisms, the leakage of oil driven by the difference in specific gravities of oil and seawater is difficult to estimate. A two‐layer mathematical model and results of laboratory experiments concerning the buoyancy‐driven leak rates are ...
C. Kranenburg, E. Vegt
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Submarine Pipeline Support By Marine Sediments

Offshore Technology Conference, 1971
ABSTRACT This paper deals with the submarine pipeline installed on the bottom. Its summarizes the state of the art in submarine pipeline foundation design as extracted from publications available to the practicing engineer. In particular, it covers the quantitative evaluation of initial settlement.
Sam W. Small, Russell D. Tamburello, Peter J. Piaseckyj   +2 more
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