Performance Related Parameters of Flexible Connections Used in Offshore Pipelines

2002 ◽  
Author(s):  
Alok Kumar ◽  
Michael E. Hogan
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Mechanical Response ◽  
Structural Performance ◽  
Gas Mixture ◽  
Short Term ◽  
Offshore Pipelines ◽  
High Pressure High Temperature ◽  
Flexible Connections

Despite continued advances in rubber technology, the design of elastomeric flexible connections, used in offshore pipelines transporting high-pressure/high-temperature hydrocarbon fluid/gas mixture, remains more of an art than a science, primarily due to the intricate behavior of rubber. The mechanical response of rubber is dependent on time, temperature and mode of loading. It is susceptible to explosive decompression damage. Rubber’s non-linear stress-strain curves, creep, hysteresis and other properties are influenced not only by the method of fabrication but also by age. If these characteristics are not accounted for properly, the result can be less precision in design compared with metals. At present, there are no codes or standards that directly address the design, analysis or evaluation of the elastomeric flexible connections used in offshore oilfield applications. Based on the results of the recent research, the significance of key parameters that affect the short term and long term structural performance of elastomeric flexible connections is presented in this paper.

A Case Study of High Pressure/High Temperature Pipeline for Ice Scour Design Using 3D Continuum Modeling

2008 ◽  
Author(s):  
Abdelfettah Fredj ◽  
George Comfort ◽  
Aaron Dinovitzer
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Material Behavior ◽  
Pipe Material ◽  
Arbitrary Lagrangian Eulerian ◽  
Continuum Modeling ◽  
Offshore Pipelines ◽  
Eulerian Formulation ◽  
High Pressure High Temperature ◽  
Non Linear

Offshore pipelines in ice environments are increasingly required to operate at higher pressure and temperature conditions. These offshore pipelines can be subjected to stress and strains resulting from loading condition and ice scour created in the area. This paper describes a study performed to investigate the mechanical behavior of High Pressure/High Temperature (HP/HT) pipelines to withstand ice scouring events. A parametric study was completed to define the governing parameters for HP/HT pipeline design. This study was based on 3D continuum modeling with an ALE (Arbitrary Lagrangian Eulerian) formulation that was developed and run using LS-DYNA. The model incorporated large deformation theory, non-linear pipe-soil interaction and non-linear pipe material behavior to define ice interaction induced pipe deformations.

Global Buckling Assessment of High Pressure and High Temperature (HP/HT) Offshore Pipeline

2010 ◽  
Author(s):  
Seung-Ho Yang ◽  
Jong-Jin Jung ◽  
Yun-Hak Kim ◽  
Woo-Seob Lee ◽  
Jong-Bae Kim
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Pipeline System ◽  
Fe Model ◽  
Offshore Pipelines ◽  
Buckling Behavior ◽  
High Pressure High Temperature ◽  
Offshore Pipeline ◽  
Global Buckling ◽  
The Stability

In recent years, requirement for the consideration of global buckling due to high pressure/high temperature (HP/HT) condition has increased in the detailed design of offshore pipelines on a seabed. The interaction between pipeline and seabed including support structures or sleepers gives a significant effect on buckling behavior. Global lateral buckling analysis has been carried out to assess the stability of offshore HP/HT pipelines considering the interaction between HP/HT submarine pipeline system/foundation structure and seabed. A non-linear finite element method is used in the present static analysis using the ABAQUS program. The FE model considers concrete sleepers as well as 3-D profile of the seabed. The stress distribution and lateral amplitude of the pipeline were evaluated and remedial measures were suggested to ensure that pipe stresses and strains are kept within allowable limits. Sleepers are designed as a buckle trigger which can provide artificial imperfection to allow pipe to move laterally and mitigate axial force. Comparative study could provide design strategy of pipeline related to sleeper supports.

scholarly journals High-pressure synthesis and crystal structure of the mixed-cation borate Ga4In4B15O33(OH)3

2019 ◽  
Vol 74 (4) ◽  
pp. 357-363
Author(s):  
Daniela Vitzthum ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Mixed Cation ◽  
High Pressure High Temperature ◽  
Pressure Synthesis

AbstractThe mixed cation triel borate Ga4In4B15O33(OH)3 was synthesized in a Walker-type multianvil apparatus at high-pressure/high-temperature conditions of 12.5 GPa and 1300°C. Although the product could not be reproduced in further experiments, its crystal structure could be reliably determined via single-crystal X-ray diffraction data. Ga4In4B15O33(OH)3 crystallizes in the tetragonal space group I41/a (origin choice 2) with the lattice parameters a = 11.382(2), c = 15.244(2) Å, and V = 1974.9(4) Å3. The structure of the quaternary triel borate consists of a complex network of BO4 tetrahedra, edge-sharing InO6 octahedra in dinuclear units, and very dense edge-sharing GaO6 octahedra in tetranuclear units.

Iodine-mediated high-pressure high-temperature carbonization of hydrocarbons and synthesis of nanodiamonds

2021 ◽  
Vol 137 ◽  
pp. 111189
Author(s):  
E.A. Ekimov ◽  
K.M. Kondrina ◽  
I.P. Zibrov ◽  
S.G. Lyapin ◽  
M.V. Lovygin ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Pressure High Temperature

scholarly journals Multianvil High-Pressure/High-Temperature Synthesis and Characterization of multiferroic HP-Co3TeO6

2021 ◽  
Author(s):  
Gunter Heymann ◽  
Elisabeth Selb ◽  
Toni Buttlar ◽  
Oliver Janka ◽  
Martina Tribus ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Type Structure ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Space Group ◽  
Crystal System ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

By high-pressure/high-temperature multianvil synthesis a new high-pressure (HP) phase of Co3TeO6 was obtained. The compound crystallizes in the acentric trigonal crystal system of the Ni3TeO6-type structure with space group R3...

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