... to HP/HT condition. It provides an out-of-straightness feature as a triggering agent for global lateral buckling at designated locations to absorb the flowline expansion if properly designed. Although the residual curvature method has been implemented in shallow water regions installed by reel-lay...

... events, that could generate pipe instability and, in the worst-case scenario, thepipe collapse. Current offshore regulations provide the requirements to be respected during pipelaying operations in terms of Buckle Detection to meet the pipeline Piggability requirements. The debate on the use...

... Abstract A study on the feasibility of applying the Residual Curvature Method (RCM) as the primary global-buckle triggering mechanism for deep water high-temperature/high-pressure (HPHT) pipelines has been conducted using a Virtual Anchor Spacing (VAS) model on a flat seabed. RCM has only been...

... Abstract Lateral buckling mitigation design for HPHT pipe-in-pipe system is technically challenging and at times the reliability of proven buckling mitigation options may come into severe technical scrutiny for some HPHT pipe in pipe systems on the undulating seabed. The Residual Curvature...

...Abstract Abstract The design of a long gas flowline laid on a rough seabed and in which HP/HT gas is circulating shows that the numerous spans along the line were all acceptable and that some acceptable lateral buckles will occur at some key features (crests). A long section of the line...

... the limit value straightforwardly, based on fundamental principles, and has been implemented in a spreadsheet. Providing immediate results, it permits quick assessment of the effects of many parameters such as soil resistance, operating loads, as well as the number and location of global buckles...

... for much of the time.) This paper first describes the walking phenomena as observed for the flowline, including the interactions with lateral buckles, and the finite element simulations of them. Then it describes a novel way of restraining such walking, by use of pipe-clamping mattresses (PCMs...

... conditions can cause the system to experience thermomechanical buckling, which can lead to a structural failure of the system. In order to control these thermomechanical loads and ensure that pipeline is within a safe operating margin, the potential buckling formation locations need to be assessed and may...

... Making forward predictions of a pipeline's behaviour from an operational base state requires a working knowledge of the pre-existing stresses and strains. To gain this working knowledge for a pipeline that has undergone lateral buckling requires either an engineering assessment that can...

... Det Norske Veritas; " Offshore Standard DNV-OS-F101, Submarine Pipeline Systems ". Det Norske Veritas; " Recommended Practice DNV-RP-F110, Global Buckling of Submarine Pipelines; Structural Design due to High Temperature/High Pressure ". ANSYS Inc.; " Theory Reference - ANSYS...

... Abstract This paper describes and explores the effects of geotechnical variability and uncertainty on the design of pipelines for thermal buckling and axial walking. Geotechnical input parameters – ‘friction factors’ – are often assigned extremely wide ranges between low estimates (LE...

... Abstract The majority of the deepwater pipelines operating in the Gulf of Mexico (GoM) carry hydrocarbons at a high pressure and temperature resulting in the system's thermal expansion. In order to relieve the high stresses due to thermal expansion, these pipelines are designed to use buckle...

... strength, with the thermo-mechanical design including buckling and walking mitigation. The combination of a heavy pipe-in-pipe cross section and very soft seabed soils further complicated the design. The buckling design solutions developed were compatible with installation in 2km water depth, used proven...

... Abstract This paper summarizes key areas of research and development undertaken by the SAFEBUCK Joint Industry Project (JIP), including the development of engineering models and the testing of pipe-soil interaction, fatigue and local buckling. The SAFEBUCK Joint Industry Project set out...

... Abstract This paper reviews the requirements for monitoring pipelines susceptible to lateral buckling and walking, focusing specifically on the methods available for surveying such pipelines, the accuracy required and the subsequent review and analysis of system integrity, which has also...

... plasticity with high water content. Both of these elements are major aggravating factors for pipeline instabilities: lateral buckling and pipeline walking. The paper presents and illustrates practical measures which are developed by the contractors for mitigating the risks of failures associated...

... Abstract The SAFEBUCK JIP was initiated to develop methodologies to deliver a safe and effective pipeline design that admits lateral buckling. A key limit state for designing to accommodate lateral buckling is local buckling. Local buckling is driven by the high imposed bending in combination...

... Abstract Global buckling of submarine pipelines may happen when the expansion due to temperature and pressure in the pipeline is restrained by the pipe/soil resistance. Global buckling may occur for both trenched pipelines (upheaval buckling) and for exposed pipelines (lateral buckling...

... on a number of deepwater developments and discusses the issues with these control methods, including the increased potential for route-curve pullout. The paper also investigates the complex interaction between pipeline walking and lateral buckling. It is known that lateral buckles along a pipeline can...

... Abstract A large subsea development will comprise a floating production system connected to subsea wells by a large network of infield flowlines. These flowlines are all susceptible to lateral buckling and pipe-walking under operating conditions, with the challenge of meeting design limits...