Integral buckle arrestors for offshore pipelines: Enhanced design criteria

2008 ◽  
Vol 50 (6) ◽  
pp. 1058-1064 ◽  
Author(s):  
L.-H. Lee ◽  
S. Kyriakides ◽  
T.A. Netto
Keyword(s):  
Design Criteria ◽  
Offshore Pipelines ◽  
Buckle Arrestors

Comparison of Numerical Results and Design Criteria for Buckle Propagation and Buckle Arrestor Design

2006 ◽  
Author(s):  
Thomas Plonski ◽  
Gundula Stadie-Frohbo¨s ◽  
Gordon Jokisch
Keyword(s):  
Wall Thickness ◽  
External Pressure ◽  
Design Criterion ◽  
Numerical Results ◽  
Design Criteria ◽  
Technical Solution ◽  
Offshore Pipelines ◽  
External Impact ◽  
Buckle Propagation ◽  
Buckle Arrestors

Buckle propagation is a relevant design criterion for deep-water offshore pipelines. Imposed by external impact or local bending, e.g. during laying, a local buckle can be initiated, thereby decreasing the collapse strength of the pipeline. As a result of the high ambient external pressure, the buckle can start to propagate. Several design criteria for buckle propagation exist. This paper compares different design criteria with numerical results to obtain an impression of the levels of conservatism applied in the various codes. In most design cases, it is not suitable to avoid buckle propagation by using an increased wall thickness over the entire pipeline. Therefore, buckle arrestors are installed to stop the propagation. The common technical solution is to install sections of thicker pipeline, which requires that the buckle arrestor wall thickness and the length of the buckle arrestor have to be determined during design. A distinction is drawn between short and long buckle arrestors. Both cases are considered here. The design of the buckle arrestor can be carried out by using well-known criteria, such as the criteria developed by Kyriakides, Langner or Torselletti et al. These criteria are compared with experimental data. Numerical calculations are carried out and the results are compared with the design criteria.

Carbon fibre buckle arrestors for offshore pipelines

2021 ◽  
Vol 111 ◽  
pp. 102633
Author(s):  
Mahmoud Alrsai ◽  
Hassan Karampour ◽  
Wayne Hall ◽  
Alex K. Lindon ◽  
Faris Albermani
Keyword(s):  
Carbon Fibre ◽  
Offshore Pipelines ◽  
Buckle Arrestors

Enhanced Design Criteria for Offshore Pipeline Integral Buckle Arrestors

2008 ◽  
Author(s):  
L.-H. Lee ◽  
S. Kyriakides ◽  
T. A. Netto
Keyword(s):  
Finite Element ◽  
Thick Wall ◽  
Design Criteria ◽  
Finite Element Models ◽  
Design Formula ◽  
Offshore Pipeline ◽  
Deformation Plasticity ◽  
The Difference ◽  
Buckle Arrestors ◽  
Empirical Design

Integral buckle arrestors are relatively thick-wall rings periodically welded in an offshore pipeline at intervals of several hundred meters in order to safeguard the line in the event a propagating buckle initiates. They provide additional circumferential rigidity and thus impede downstream propagation of collapse, limiting the damage to the length of pipe separating two arrestors. The effectiveness of such devices was studied parametrically through experiment and numerical simulations in Park and Kyriakides [2]. The experiments involved quasi-static propagation of collapse towards an arrestor, engagement of the arrestor, temporary arrest, and the eventual crossing of collapse to the downstream pipe at a higher pressure. The same processes were simulated with finite element models that included finite deformation plasticity and contact. The experimental crossover pressures enriched with numerically generated values were used to develop an empirical design formula for the arresting efficiency of such devices. A recent experimental extension of this work revealed that for some combinations of arrestor and pipe yield stresses the design formula was overly conservative. Motivated by this finding, a new broader parametric study of the problem was undertaken which demonstrated that the difference between the pipe and arrestor yield stress affects significantly the arrestor performance. The original arrestor design formula was then modified to include the new experimental and numerical results producing an expression with a much wider applicability.

The cross-over mechanisms of integral buckle arrestors for offshore pipelines

2017 ◽  
Vol 67 ◽  
pp. 236-247 ◽  
Author(s):  
Jian-xing Yu ◽  
Jing-hui Duan ◽  
Zhen-zhou Sun ◽  
Yang Yu ◽  
Meng-ning Wu
Keyword(s):  
Offshore Pipelines ◽  
The Cross ◽  
Buckle Arrestors

On the Effectiveness of Collars as Buckle Arrestors for Offshore Pipelines

2005 ◽  
Vol 1 (2) ◽  
pp. 83-89
Author(s):  
Theodoro A. Netto ◽  
Ilson P. Pasqualino ◽  
Taver L. Mesquita
Keyword(s):  
Offshore Pipelines ◽  
Buckle Arrestors

Pipe Strength and Deformation Capacity: A Novel FE Tool for the Numerical Lab

2014 ◽  
Author(s):  
Lorenzo Maria Bartolini ◽  
Alberto Battistini ◽  
Lorenzo Marchionni ◽  
Antonio Parrella ◽  
Maurizio Spinazzè ◽  
...  
Keyword(s):  
Deep Water ◽  
Fem Analysis ◽  
Fe Model ◽  
Deformation Capacity ◽  
Mechanical Behaviors ◽  
Offshore Pipelines ◽  
Local Characteristics ◽  
Strength And Deformation ◽  
Global And Local ◽  
Buckle Arrestors

Future offshore pipelines development moves towards challenging operating condition and deep/ultra-deep water applications. Understanding the failure mechanisms and quantifying the strength and deformation capacity of pipelines, special components (buckle arrestors, wye, etc.) and in-line structures (in-line sled, in-line valve, in-line tee, etc.) is a need, under installation and operation loads, taking in account different geometrical characteristics and mechanical behaviors. The objective of this paper is to present and discuss recent FEM approaches integrating global and local analyses to evaluate the pipeline response and local effects, respectively. Thanks to this method the results coming from the global FEM analysis (main loads and driving phenomena) are used as input data for local FE Model with the aim to detect stress/strain intensification and other issues due to the local characteristics. In this paper: • The challenges of future deep water offshore pipelines are briefly presented; • The typical loading scenarios for pipelines during installation and operation are discussed; • The PipeONE 2014 tool, developed to facilitate the input/output data sharing between global and local FEM analyses, is presented and fully described in its main characteristics and capabilities; • An example is presented with the aim to understand and to appreciate the PipeONE 2014 functionality in FE modeling.

Pipeline Collapse Methodology for Ultra-Deepwater

2005 ◽  
Author(s):  
Han S. Choi ◽  
Thomas R. Ayers
Keyword(s):  
Design Methodology ◽  
Mechanical Design ◽  
Combined Loading ◽  
Design Criteria ◽  
Design Codes ◽  
Physical Test ◽  
Design Methodologies ◽  
The World ◽  
Collapse Prediction ◽  
Buckle Arrestors

The objective of this paper is to summarize current ultra-deepwater (i.e. up to 3,500 meters water depth) pipeline mechanical design methodologies in the Gulf of Mexico (GOM), and the rest of the world. The standard mechanical design for ultra-deepwater pipelines in the GOM is based on API RP 1111. API code also has been used for deepwater projects in west Africa. DNV code OS-F101 was mostly used for deepwater projects in offshore Brazil and Europe. Some pipeline designs in the GOM have started to incorporate parts of the DNV design methodology. A discussion of collapse only design and combined loading (i.e. pressure + bending) design will be presented. The buckle arrestors shall be designed along with the ultra-deepwater pipeline mechanical design. The best design criteria are obtained from physical full-scale collapse testing. The comparison of the physical test data and collapse calculations using the DNV and API codes will be presented. It was found that the conservatism still exists within collapse prediction for ultra-deepwater pipeline using modern design codes such as DNV OS-F101 and API RP 1111. Recommendations of the mechanical design methodologies for the ultra-deepwater pipeline are presented.

Fracture Control — Offshore Pipelines: Current Status of Fracture Assessment for Pipelines, Limitations and the Need for Development

2005 ◽  
Author(s):  
Roberto Bruschi ◽  
Enrico Torselletti ◽  
Luigino Vitali ◽  
Mons Hauge ◽  
Erik Levold
Keyword(s):  
Failure Modes ◽  
Design Guidelines ◽  
Assessment Methods ◽  
Current Status ◽  
Design Criteria ◽  
Safety Factors ◽  
Design Guideline ◽  
Offshore Pipelines ◽  
Fracture Assessment ◽  
Fracture Control

Recent development plans envisage the exploitation of very deep offshore reservoirs as well as transport of hydrocarbons at temperature and pressure conditions far more severe than in past projects. Technical feasibility of such projects requires higher material utilisation, and the design guidelines need to be improved to allow for the new design conditions. Fracture assessment methods have been used in the evaluation of pipeline integrity for several years. In particular, the verification of acceptable defect sizes for installation and operational loads are now widely used and assessment methods are referenced in pipeline standards and guidelines. However, design guidelines are still missing the calibrated safety factors and stringent design format required to let the fracture failure mode be consistent with the other failure modes in the pipeline design such as bursting, local buckling and fatigue. The Fracture Control Offshore Pipelines Project is a Joint Industry Research and Development Project, whose objective is to study the behaviour of defected girth welds in pipelines subject to construction and operational loads ever experienced before. Due to the envisaged high loading condition and the high costs of recent offshore pipeline projects it is important, with an accurate defect assessment analysis, to avoid delays caused by unnecessary repairs or failures because of flaws that should have been detected and repaired. The final objective is the development of specific design criteria in the form of a design guideline to be used in the verification and design of offshore pipelines against the fracture/plastic collapse failure of a defected girth weld. The design criteria are based on the application of reliability methods to calibrate the partial safety factors in compliance with the safety philosophy established by DNV OS-F101 and will include the rational application of new NDT techniques. The JI Project is carried over 5 years and has started in 2002. The JI project is sponsored by the industry (BP, ENI Norge, Hydro and Statoil) and by the Norwegian Research Council. This paper describes the current status of existing fracture assessment procedures for pipelines with particular attention to their limitations and the needs for development and a brief overview of the results obtained in the project so far as well as the challenges to be solved in the project.

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