Sandwich Pipes for Ultra-Deep Waters

2002 ◽  
Author(s):  
T. A. Netto ◽  
J. M. C. Santos ◽  
S. F. Estefen
Keyword(s):  
Thermal Insulation ◽  
External Pressure ◽  
Core Material ◽  
Structural Behavior ◽  
Structural Performance ◽  
Small Scale ◽  
The Finite Element Method ◽  
Steel Pipes ◽  
The Core ◽  
Deep Waters

Pipeline systems for deepwater applications must be designed to withstand operational loads and to give adequate thermal insulation to the hydrocarbon being transported. Sandwich pipelines composed by inner and outer steel pipes and either cement or polypropylene as core material are proposed here as viable alternatives to currently used pipe-in-pipe systems. The main advantage of these sandwich structures is that the core material and geometry can be selected so to provide both thermal insulation and good structural performance in conjunction with inner and outer pipes. In this paper, the structural behavior of such sandwich pipes under external pressure is studied through a series of small scale experiments and nonlinear numerical analyses based on the finite-element method.

Propagation of Buckles in Sandwich Pipes Under External Pressure

2005 ◽  
Author(s):  
I. P. Pasqualino ◽  
M. I. Lourenc¸o ◽  
T. A. Netto
Keyword(s):  
Three Dimensional ◽  
Nonlinear Behavior ◽  
Element Model ◽  
External Pressure ◽  
Core Material ◽  
Small Scale ◽  
Ongoing Research ◽  
Scale Models ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Sandwich pipes have been considered feasible conceptions for ultra deepwater pipelines, since they are capable to work at low temperatures and withstand high hydrostatic pressures. Sandwich pipelines are composed by inner and outer metallic pipes and a suitable core material which must provide high compression strength and good thermal insulation. The aim of this ongoing research is to study the quasi-static propagation of buckles in sandwich pipes. In this paper, a three-dimensional finite element model considering material and geometric nonlinear behavior is presented. The mesh discretization is determined through a detailed mesh sensitivity analysis. Some experiments with small scale models combining aluminum pipes and polypropylene as core material were carried out to calibrate the numerical model. The propagation pressure is evaluated under different bonding conditions between pipe layers.

Strength Analyses of Sandwich Pipes for Ultra Deepwaters

2004 ◽  
Vol 72 (4) ◽  
pp. 599-608 ◽  
Author(s):  
Segen Farid Estefen ◽  
Theodoro Antoun Netto ◽  
Ilson Paranhos Pasqualino
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Ultimate Strength ◽  
Thermal Insulation ◽  
Research Work ◽  
Element Model ◽  
Material Behavior ◽  
Core Material ◽  
Small Scale ◽  
Mechanical Resistance

Design requirements for pipelines regarding both ultimate strength and flow assurance in ultra deepwater scenarios motivated the development of a new sandwich pipe which is able to combine high structural and thermal insulation properties. In this concept, the annulus is filled with low cost materials with adequate thermal insulation properties and good mechanical resistance. The aim of this research work is to perform small-scale laboratorial tests and to develop a finite element model to evaluate the structural performance of such sandwich pipes with two different options of core material. After calibrated in view of the experimental results, a three-dimensional finite element model incorporating nonlinear geometric and material behavior is employed to perform strength analyses of sandwich pipes under combined external pressure and longitudinal bending. Ultimate strength envelopes for sandwich pipes are compared with those generated for single-wall steel pipes with equivalent collapse pressures. The study shows that sandwich pipe systems with either cement or polypropylene cores are feasible options for ultra deepwater applications.

An Experimental Study on Material and Structural Properties of Structural Insulated Panels (SIPs)

2011 ◽  
Vol 147 ◽  
pp. 127-131 ◽  
Author(s):  
Jian Yang ◽  
Zhen Li ◽  
Qiang Du
Keyword(s):  
Experimental Study ◽  
Structural Properties ◽  
Core Material ◽  
Small Scale ◽  
Axial Loads ◽  
Shear Tests ◽  
Double Shear ◽  
The Core ◽  
Structural Insulated Panels ◽  
New Type

An experimental study was carried out to examine the material and structural properties of a new type of structural insulated panel (SIP) comprising the plywood board as facial panels and the Styrofoam as the core material. Material properties were characterized by subjecting specimens to bending, compression, tension and double shear tests. SIP specimens, both in small-scale and prototype sizes, were tested under bending, racking and axial loads respectively. This paper will report these tests and the obtained results.

Comparative Structural Analyses Between Sandwich and Steel Pipelines for Ultra-Deep Water

2002 ◽  
Author(s):  
I. P. Pasqualino ◽  
B. C. Pinheiro ◽  
S. F. Estefen
Keyword(s):  
Thermal Insulation ◽  
Deep Water ◽  
External Pressure ◽  
Core Material ◽  
Mechanical Resistance ◽  
Insulation Material ◽  
Ongoing Research ◽  
Structural Resistance ◽  
Water Pipelines ◽  
Pipe Systems

Pipe-in-pipe systems are usually composed of two concentric metal pipes with or without an insulation material in the annulus region. Design requirements for ultra-deep water pipelines motivated the development of a new pipe-in-pipe conception in which the annulus is filled with materials that combine low cost, adequate thermal insulation properties and good mechanical resistance. The aim of this ongoing research project is to evaluate the structural performance of sandwich pipes with two different options of core material. Because of their wide availability and relatively low costs, the materials considered in this study were cement and polypropylene for the annulus, with pipes made of API X-60 grade steel. In this paper, a three-dimensional finite element model considering material and geometric nonlinear behavior was developed. This numerical model was used to perform a parametric study to determine the collapse envelopes of different pipe-in-pipe configurations under combined bending and external pressure. The collapse envelopes were compared with others obtained for steel pipelines of equivalent collapse pressure. The study showed that the pipe-in-pipe systems with either cement or polypropylene cores are feasible options to ultra-deep water pipelines fulfilling concomitantly both the requirements of structural resistance and thermal insulation.

Novel Honeycomb Glassfiber Mat as the Core of Vacuum Insulation Panel

2014 ◽  
Vol 900 ◽  
pp. 247-250
Author(s):  
Cheng Dong Li ◽  
Zhao Feng Chen
Keyword(s):  
Thermal Insulation ◽  
High Performance ◽  
Three Dimensional ◽  
High Strength ◽  
Glass Wool ◽  
Core Material ◽  
The Core ◽  
Vacuum Insulation ◽  
Novel Structure ◽  
Chopped Strand Mat

Vacuum insulation panels (VIPs) are regarded as one of the most promising high-performance thermal insulation solutions on the market today. In this paper, a novel structure, i.e., honeycomb glassfiber mat was proposed as the core material of VIP. The honeycomb glassfiber mat was composed of glass wool mat and glassfiber chopped strand mat. Among them, 70% centrifugal glass wool and 30% flame attenuated glass wool were mixed together to form the 0.5mm-thickness glass wool mat, while thirteen holes with diameter of 10mm were opened uniformly on the surface of glassfiber chopped strand mat. Glassfiber VIPs possessed honeycomb core material have superior thermal conductivity of 1.52mW/(m•K). In order to obtain better thermal insulation performance, ultrafine and stiff fibers with three-dimensional overlapping structure is preferable. Meanwhile, hollow fibers with bifurcated structure are the guarantee of high-strength core material.

scholarly journals Effect of geometrical variations on the structural performance of shipping container panels: A parametric study towards a new alternative design

2021 ◽  
Vol 8 (1) ◽  
pp. 271-306
Author(s):  
Ilham Widiyanto ◽  
Faiz Haidar Ahmad Alwan ◽  
Muhammad Arif Husni Mubarok ◽  
Aditya Rio Prabowo ◽  
Fajar Budi Laksono ◽  
...  
Keyword(s):  
Sandwich Panel ◽  
The Other ◽  
Structural Performance ◽  
Main Element ◽  
The Finite Element Method ◽  
The Core ◽  
Shipping Container ◽  
Corrugated Wall ◽  
External Loads ◽  
Static Simulation

Abstract In the field of logistics, containers are indispensable for shipments of large quantities of goods, particularly for exports and imports distributed by land, sea, or air. Therefore, a container must be able to withstand external loads so that goods can safely reach their destination. In this study, seven different models of container skins were developed: general honeycomb, cross honeycomb, square honeycomb, corrugated wall, flat, flat with a single stiffener, and flat with a cross stiffener. Testing was performed using the finite element method. In the static simulation, the best results were obtained by the model with corrugated walls. As the main element and the content of the sandwich panel structure, the core plays a role in increasing the ability of the structure to absorb force, thereby increasing the strength of the material. In the thermal simulation, the best results were obtained by the general honeycomb walls. Vibration simulations also showed that the square honeycomb design was better at absorbing vibration than the other models. Finally, the corrugated model had the best critical load value in the buckling simulation.

Collapse Mechanism of Unbounded Metal-Composite Pipes Under Hydrostatic Pressure

2008 ◽  
Author(s):  
Ilson Paranhos Pasqualino ◽  
Flavio Antoun Netto ◽  
Theodoro Antoun Netto
Keyword(s):  
Thermal Insulation ◽  
Progressive Failure ◽  
Composite Layer ◽  
External Pressure ◽  
Small Scale ◽  
Plastic Behavior ◽  
Collapse Mechanism ◽  
Fe Model ◽  
Metal Composite ◽  
Composite Pipes

Metal-composite pipes are feasible alternatives for deepwater applications where thermal insulation and structural behavior requirements must be met. They are composed of an inner metal pipe and an outer structural composite layer which act in combination to provide excellent structural strength and additional thermal insulation. In this work, the mechanical behavior of such pipes under external pressure is investigated through numerical analyses and experimental tests. Small scale models were tested under external pressure to calibrate a finite element based numerical model. The FE model incorporates nonlinear kinematics, progressive failure analyses of the composite layer, and metal elastic-plastic behavior. Unbounded interface between metal and composite was assumed through frictionless surface-based contact model in other to obtain a conservative estimate of the metal-composite pipe performance under external pressure.

Studying the Effects of Different Materials and Thickness of Titanium Layer to Implant Based on the Finite Element Method

2014 ◽  
Vol 518 ◽  
pp. 196-200
Author(s):  
Yan Qing Ma ◽  
Ling Chen ◽  
Shao Kai Wang ◽  
Xing Hua Niu
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Decisive Role ◽  
Titanium Implants ◽  
Core Material ◽  
The Finite Element Method ◽  
Titanium Layer ◽  
The Core ◽  
Different Thickness ◽  
Ansys Workbench

Implant young's modulus has a decisive role on bone interface stress distribution and transmission. In this paper, using UG software, change the traditional titanium implants into a new implant by the different thickness of the titanium layer wrapped in a variety of materials, and using ansys workbench changes thickness and Young's modulus of the core material, analysis of various the case of force and deformation of the implant, looking for a good biomechanics is both compatible with good mechanical properties and implant materials. Through analysis, the ratio of all the results obtained: titanium layer thickness and Young's modulus of the core material has an impact on force and deformation.

Residual Strength of Corroded Pipelines Under External Pressure: A Simple Assessment

2006 ◽  
Author(s):  
T. A. Netto ◽  
U. S. Ferraz ◽  
A. Botto
Keyword(s):  
Numerical Models ◽  
Simple Procedure ◽  
External Pressure ◽  
Small Scale ◽  
The Finite Element Method ◽  
Offshore Pipelines ◽  
Collapse Pressure ◽  
Irregular Shapes ◽  
Internal Surfaces ◽  
Corrosion Defects

The loss of metal in a pipeline due to corrosion usually results in localized pits with various depths and irregular shapes on its external and internal surfaces. The effect of corrosion defects on the collapse pressure of offshore pipelines was studied through combined small-scale experiments and nonlinear numerical analyses based on the finite element method. An extensive parametric study using 2-D and 3-D numerical models was carried out encompassing different defect geometries and their interaction with pipe ovalization. This paper briefly summarizes these results, which are subsequently used to develop a simple procedure for estimating the collapse pressure of pipes with narrow defects.

Sandwich Pipes With Strain Hardening Cementitious Composites (SHCC): Numerical Analyses

2014 ◽  
Author(s):  
Guangming Fu ◽  
Claudio Moura Paz ◽  
John Alex Hernández Chujutalli ◽  
Marcelo Igor Lourenço ◽  
Dirney Bessa de Lima ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Oil And Gas ◽  
Cost Effective ◽  
External Pressure ◽  
Small Scale ◽  
Effective Solution ◽  
Hyperbaric Chamber ◽  
Structural Requirements ◽  
Structural Resistance ◽  
Experimental Correlation

Sandwich pipes (SP) combining high structural resistance with thermal insulation have been considered as an effective solution for using in ultra deepwater pipelines. Research has been conducted at COPPE/UFRJ with different core materials aiming to develop qualified pipes to transport deepwater oil and gas, especially for the pre-salt reservoirs in offshore Brazil. SPs using SHCC material are easy to manufacture and cost-effective. Moreover, the composition of the SHCC material can be controlled to achieve structural requirements along with good thermal insulation. Investigation on the buckling under external pressure and feasibility of installation by reel-lay method is required. This study presents numerical analysis of the collapse, collapse propagation and bending of sandwich pipes with different geometries. The Drucker-Prager formulation is employed for SHCC constitutive model and it is calibrated through small-scale tests. Model geometries match full scale specimens manufactured and tested in bending apparatus and hyperbaric chamber. Numerical/experimental correlation is also presented.

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