scholarly journals Assessment of Offshore Pipeline Reliability against Lateral Buckling

2019 ◽  
Vol 12 (Summer and Autumn 2019) ◽  
pp. 41-48
Author(s):  
Mohammad Hossein Sharifi ◽  
Abdolrahim Taheri ◽  
Mohammad Bagher Faraji Pool ◽  
◽  
◽  
...  
Keyword(s):  
Lateral Buckling ◽  
Offshore Pipeline

Finite-Element Modeling of Offshore Pipeline Lateral Buckling

2019 ◽  
Vol 10 (4) ◽  
pp. 04019029 ◽  
Author(s):  
Tao Zhou ◽  
Yinghui Tian ◽  
David J. White ◽  
Mark J. Cassidy
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Lateral Buckling ◽  
Element Modeling ◽  
Offshore Pipeline

Comparison of Design and Operational Behaviour of an Offshore Pipeline With Controlled Lateral Buckling

2012 ◽  
Author(s):  
Rafael F. Solano ◽  
Bruno R. Antunes ◽  
Alexandre S. Hansen ◽  
Arek Bedrossian ◽  
Graeme Roberts
Keyword(s):  
Detailed Comparison ◽  
Relative Strength ◽  
Operating Conditions ◽  
Design Stage ◽  
Brazilian Coast ◽  
Lateral Buckling ◽  
Offshore Pipeline ◽  
Safety Margins ◽  
Set Up ◽  
Operational Behaviour

It is imperative to adopt some conservative premises in the engineering calculations undertaken during the design stage of an offshore pipeline susceptible to lateral buckling, in order to achieve a design with adequate levels of robustness and integrity throughout the pipeline’s design life. The conservatism can be attached to many uncertainties such as the pipe-soil interaction — interpreted as-soil friction factors — the seabed stiffness and profile and even the as laid lateral out-ofstraightness. Once in operation, these effects will come into play and the pipeline may behave slightly differently to that anticipated in design, depending on the relative strength of the natural uncertainties compared to the design features such as engineered buckling triggers. The over-riding intention in design is, of course, to enable the pipeline to withstand, with sufficient safety margins, the maximum stresses and strains anticipated to occur by realistic predictions in the design stage. In recent years, many kilometres of deepwater pipelines have been designed and installed along the Brazilian coast using the principle of controlled lateral buckling, in which engineered buckle triggers, such as sleepers and distributed buoyancy sections, are deployed at regular intervals along the pipeline. The purpose of these triggers it to initiate a sufficient number of benign buckles along the pipeline and thereby relax the compressive forces set up as a result of thermal expansion without violating safe limits on stress and strain in the pipelines. In addition to the engineered buckling sites, however, the natural seabed features and associated uncertainties will interact with the pipeline’s behaviour and create additional natural buckle sites. To anticipate these sites and discover their importance at the design stage is recognised as a real challenge, particularly as precise post-installed and in-operation surveys are not normally carried out with the intention of confirming such buckle sites and design assumptions. The work reported in this paper is a detailed comparison between the initial design and observed operational behaviour of an offshore HP/HT pipeline, mainly in terms of the engineered and natural buckles actually formed along the pipeline, the severity of these buckles and some conclusions concerning the effects of initial imperfections and pipe-soil interaction characteristics considered in detailed design. It is hoped that this rare feedback from real operating conditions on installed pipelines, will be of great interest to pipeline designers and lead to more efficient and better understood design processes and encourage Operators to undertake more regular and sophisticated surveys of operating and installed pipelines for the benefit of future projects.

Initial Approach to Assess Lateral Buckling Behavior: Comparison Between Design and Operational Condition of Offshore Pipeline

2010 ◽  
Author(s):  
Rafael Familiar Solano ◽  
Bruno Reis Antunes ◽  
Alexandre Santos Hansen
Keyword(s):  
Mechanical Design ◽  
Design Strategy ◽  
Operating Conditions ◽  
Lateral Buckling ◽  
Campos Basin ◽  
Buckling Behavior ◽  
Offshore Pipeline ◽  
Route Length ◽  
Oil Export ◽  
Pipeline Route

Recently Petrobras has been developing a production module of Roncador field through the P-52 platform in the Campos Basin, offshore Brazil. This platform is a floating production facility located in deep water and was tied back to the PRA-1 platform in shallow water by an 18-inch pipeline in order to export the oil production. This pipeline operates under high pressure and high temperature (HP/HT) conditions and was laid on the seabed. As a result of the extreme operating conditions, this pipeline is highly susceptible to lateral buckling and a buckle initiation strategy based on triggers to control the buckling behavior was designed. Thus sleepers and distributed buoyancies were designed and installed along the pipeline route. In addition to the buckles at the triggers, some additional, on-bottom, buckles were assessed in order not to compromise the design strategy. In recent geophysical data surveys carried out along the route length with the pipeline in operation, both engineered and on-bottom buckles were identified. This paper aims to present the thermo-mechanical design of the P-52 oil export pipeline, performing a comparison between some results obtained in design and observed during operation. Thus this paper intends to evaluate the pipeline as-built plus the operational pipeline configurations, and to assess the robustness of the design strategy applied regarding lateral buckling behavior.

Offshore pipeline buried in Indian coastal clay: buckling behaviour analysis

2021 ◽  
pp. 1-16
Author(s):  
Debtanu Seth ◽  
Bappaditya Manna ◽  
J. T. Shahu ◽  
Tiago Fazeres-Ferradosa ◽  
Francisco Taveira-Pinto ◽  
...  
Keyword(s):  
Behaviour Analysis ◽  
Offshore Pipeline

On the lateral buckling of uniform slender cantilever beams

1975 ◽  
Vol 11 (12) ◽  
pp. 1269-1280 ◽  
Author(s):  
Dewey H. Hodges ◽  
David A. Peters
Keyword(s):  
Cantilever Beams ◽  
Lateral Buckling

Optimization of bracing and internal support locations for beams against lateral buckling

1995 ◽  
Vol 9 (1) ◽  
pp. 12-17 ◽  
Author(s):  
C. M. Wang ◽  
K. K. Ang ◽  
L. Wang
Keyword(s):  
Lateral Buckling ◽  
Internal Support

Lateral buckling of narrow rectangular beams containing openings

1992 ◽  
Vol 43 (2) ◽  
pp. 247-254 ◽  
Author(s):  
V. Thevendran ◽  
N.E. Shanmugam
Keyword(s):  
Lateral Buckling

Effect of Full- and Small-Scale Reeling Simulation on Mechanical Properties of Weldable 13Cr Seamless Line Pipe

2013 ◽  
Author(s):  
Hidenori Shitamoto ◽  
Nobuyuki Hisamune
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Oil And Gas ◽  
Small Scale ◽  
Line Pipe ◽  
Offshore Pipeline ◽  
Oil And Gas Pipelines ◽  
Before And After ◽  
Offshore Oil And Gas ◽  
Offshore Oil

There are several methods currently being used to install offshore oil and gas pipelines. The reel-lay process is fast and one of the most effective offshore pipeline installation methods for seamless, ERW, and UOE line pipes with outside diameters of 18 inches or less. In the case of the reel-laying method, line pipes are subjected to plastic deformation multiplication during reel-laying. It is thus important to understand the change of the mechanical properties of line pipes before and after reel-laying. Therefore, full-scale reeling (FSR) simulations and small-scale reeling (SSR) simulations are applied as evaluation tests for reel-laying. In this study, FSR simulations were performed to investigate the effect of cyclic deformation on the mechanical properties of weldable 13Cr seamless line pipes. Furthermore, SSR simulations were performed to compare the results obtained by FSR simulations.

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