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Structural Analysis of a Pipeline Closure System using 2D & 3D FEA to Obtain Rapid Design Feedback

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Pipeline Engineering required an assessment of the structural performance of a new 72″ Class 300 Pipeline Closure design. This closure was larger than those previously designed and manufactured by the company. The use of FEA enabled the product designers to gather design feedback of the closure system at an early development stage without having to commit to expensive prototyping and testing.

The Company

Pipeline Engineering provides pipeline pigs and a full range of products and services to assist pipeline cleaning, pipeline protection and flow assurance in the Oil, Gas and other process industries.
Pipeline Engineering manufactures pipeline pigs, pig signalers, pipeline closures, pig launchers, pig receivers and a range of pressure vessel products. The company is recognised for its expertise in polyurethane technology and also produces other polyurethane-based products such as bend restrictors, bend limiters, track pads, filtration screens and subsea cable protection systems.

Description of a Pipe Opening Closure

Pipeline closures are pressure retaining structures designed to provide access to pipelines and pressure vessels. Pipeline Engineering has developed its closures to provide fast access to pipelines and pressure vessels.

fea_consulting_pipeline_closure_1Objectives of the Project

Pipeline Engineering required an assessment of the structural performance of a new 72″ Class 300 Pipeline Closure design. This closure was larger than those previously designed and manufactured by the company. Finite element analysis was used to assess the structural response of the closure door and the door hinge.

Multiple load cases were considered including;

  • Internal pressure loading
  • Hinge response at varying hinge angles

The analysis was used to predict deflections of the closure system, the loads and stresses on the locking keys and the deflections of the door hinge when the door was opened. The results indicated the areas where design modifications were necessary.

case_study-fea_consulting_pipeline_closure_2

case_study-fea_consulting_pipeline_closure_3

 

The Modelling Process

Pipeline Engineering supplied Wilde with 3D CAD files that were subsequently defeatured and prepared to make suitable for use with ANSYS FEA simulation software. For efficiency and accuracy, a combination of 2D and 3D methods were used.

case_stufy-fea_consulting_pipeline_closure_geometry_42D FEA Model

The door and locking system was simplified into a 2D axis-symmetric problem using ANSYS DesignModeler. Contact modelling within ANSYS was used to model load transfer between the components of the closure mechanism.

case_study-fea_consulting_pipeline_closure_2d_mesh_5Each load case was analysed to identify areas of the structure most highly affected by that load case. A technical report was prepared summarising the results for all identified operating conditions.

case_study-fea_consulting_pipeline_closure_2d_stress_results_6

3D FEA Model

A separate 3D finite element model and mesh was created to predict the response of the door hinge at different angles.

case_study-fea_consulting_pipeline_closure_3d_mesh_fullsize_7
2D FEA Results showing Stress Intensities
case_study-fea_consulting_pipeline_closure_3d_results_fullsize_8
3D FEA Results showing Stress Intensities within the Hinge & Bracket

Business Benefits from the Analysis

Finite element analysis allowed the product designers at Pipeline Engineering to gather design feedback of the closure system at an early development stage without having to commit to expensive prototyping and testing. This greatly reduced the risk of having to implement expensive modifications further along the design process and provided valuable insight into how the system would perform in operation.

 

 

 

 

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