... ABSTRACT Offshore pipelines suffer the risk of local collapse and buckling propagation when installed empty or depressurized for maintenance. This paper deals with the mechanics of local collapse and buckling propagation of long pipelines under external pressure. The innovative vector form...

..., local collapse and buckling propagation are induced by a small fault displacement and dominated by the external pressure. Both parallel and orthometric buckling propagation are observed. Whether the pressurized or unpressurized pipeline, a smaller crossing angle leads to more serious lateral...

.... upstream oil & gas flexible riser tensile armor layer experimental data metals & mining axial compression load equation riser compression load armor wire displacement offshore mechanics flexible pipe modeling & simulation armor layer external pressure stiffness arctic...

... collapse pressure equation pipe wall offshore pipeline assumption cross-section plastic collapse pressure midstream oil & gas hoop stress wall thickness dnv formulation external pressure formulation bifurcation pressure thick-walled pipe thick-wall assumption Proceedings of the Thirty...

... midstream oil & gas pipeline rasheed united states government external pressure thickness upstream oil & gas offshore pipeline karampour cylinder north america government collapse pressure composite pipeline orientation propagation fea result proceedings fiber...

... midstream oil & gas collapse pressure faceted pipeline conventional pipeline engineering pipeline faceted pipe triangular facet fe model titanium sample offshore pipeline albermani external pressure hyperbaric chamber coupon sample pipeline sample upstream oil & gas pipe...

... ABSTRACT The external pressure collapse and propagation buckling of 8-inch submarine pipeline with design pressure of 56MPa are analyzed by 3-D finite element method in this paper (ABAQUS 6.14-4). The results show that the finite element analyses results are almost the same as analytical...

... be important for pipelines in intermediate water depths. Collapse is the failure mode where the pipe cross section becomes unstable due to excessive external pressure acting on the pipe wall. It is typically viewed as buckling or bifurcation behaviour because the cross section will deform significantly only...

... below 15 that are subject to external pressure and bending, without affecting the level of conservatism underlying the code framework. The limit-state formulation for load-controlled behaviour is found to be increasingly conservative for thicker pipe walls. INTRODUCTION Background Intecsea reviewed...

... ABSTRACT This paper proposes an estimated formula for the tripping buckling strength of the ring-stiffener attached in stiffened cylindrical shells under external pressure. The proposed formula is derived assuming the tripping buckling as the buckling of only the flange supported by springs...

... ABSTRACT With the improvement of welding technology, applications of electric resistance welded (ERW) pipes have been extended to offshore pipelines. A main design factor for offshore pipelines is resistance to external pressure. The structural performance is affected by influence variables...

... Collapse behaviour of offshore pipelines under external pressure is a primary concern for ultimate limit state design structural integrity. The pipe-in-pipe system, consisting of a concentric insulated inner pipe and outer pipe, has wide applications in offshore pipelines. Under the external hydrostatic...

... The ultimate strength on steel welded ring-stiffened conical shell have not been studied in detail to the best knowledge of the authors. Although the strength and stability of the conical shell under external pressure has been the subject of a long history dated back as early as 1950's (Raetz and Pulos, 1958...

... and/or corrosion of the wall, on the buckling/collapse load bearing capacity. american petroleum institute pipeline corrosion torisphere external pressure apex wall thickness load bearing capacity dome flaw materials and corrosion sc stot 0 flowline corrosion buoyancy unit mpa thickness...

... compression on contact stress of sealing structure of the casing coupling section is numerically analyzed. The results show that the combined loads of axial tension, internal and external pressure difference and extruding force will make contact stress of the sealing structure of casing coupling change...

... the mechanical behaviour of RTP under combined external pressure and bending moment based on a solid element model. And the strength analysis and buckling analysis are performed. The classical structure of RTP is composed of three main components: an inner high-density polyethylene (HDPE) liner, middle...

... external pressure auxetic composite pipe auxetic material upstream oil & gas indentation resistance Advanced Composite Structures for Subsea Pipeline Design Development Naveen Ravirala and Paul Jukes The Jukes Group Houston, TX, USA ABSTRACT Advanced composite materials have the potential...

... design process for this specific kind of pipe is illustrated. Three formulas for calculating the individual strength capacities of the pipe when subjected to internal pressure, external pressure and pure bending are presented for initial screening assessment. And then a case study for an 8 inch metallic...

...) (2007). However, an investigation of the applicability for cold formed pipes with rounded stress vs. strain curves is not necessarily apparent from previous researches. formula fea diameter elastic collapse pressure upstream oil & gas external pressure relation thickness ratio strain...

... and measuring equipment and high technology devices, covered and protected by either one or multiple cylindrical pressure housings. The main loading to which these pressure housings are subjected during the deep sea operation is the hydrostatic external pressure, which elevates as the operational depth...