Welding Stress Numerical Simulation and Analysis of High-Pressure Pipeline

2014 ◽  
Vol 912-914 ◽  
pp. 890-894
Author(s):  
Lei Zhang ◽  
Jin Zhou Zhang ◽  
Xiao Ming Li
Keyword(s):  
High Pressure ◽  
Welding Process ◽  
Source Model ◽  
Heat Source Model ◽  
Welding Stress ◽  
Welding Temperature ◽  
Welding Arc ◽  
Pressure Pipeline ◽  
Pipeline Welding ◽  
High Pressure Pipeline

Welded stress has an important impact on quality and life of of high-pressure pipeline. Based on pipeline material performance, considered welding arc force and its mining action, selected double ellipsoidal heat source model, simulated welding process of of high-pressure pipeline, analysised welding temperature field and stress field, determined the distribution disciplines of welding stress, provides useful help on exploring the disciplines of pipeline welding.

Numerical Analysis of Welding in Fillet Weld for High-Pressure Pipeline In-Service

2014 ◽  
Vol 960-961 ◽  
pp. 517-522
Author(s):  
Lei Zhang ◽  
Jin Zhou Zhang ◽  
Wen Chun Li
Keyword(s):  
Residual Stress ◽  
High Pressure ◽  
Welding Residual Stress ◽  
Maximum Temperature ◽  
Flow State ◽  
Welding Stress ◽  
Weld Residual Stress ◽  
Pressure Pipeline ◽  
Maximum Residual Stress ◽  
High Pressure Pipeline

With the numerous applications of high-pressure pipeline, it is very important to simulate the in-service welding of the pipeline.The flow state of the medium in the pipeline can be analyzed, the temperature field and the stress field also can be simulated by applying sysweld software. The medium flow can reduce the welding residual stress and reduce welding stress range during in-service welding. Meanwhile, with the increase of flow rate of the medium, the maximum temperature of inner wall drops and the maximum weld residual stress increases by a slow growth. At the same time, the highest temperature of pipe wall increases rapidly with the increase of heat input, whereas the maximum residual stress of welded joint decreases by a slow trend.

Simulation Analysis of Clamping Force in Welding Process of Aluminum Alloy Flankwall of Urban Rail Vehicle

2018 ◽  
Vol 773 ◽  
pp. 214-219
Author(s):  
Ying Shi Sun ◽  
Duo Sun
Keyword(s):  
Aluminum Alloy ◽  
Simulation Analysis ◽  
Local Heating ◽  
Welding Process ◽  
Source Model ◽  
Clamping Force ◽  
Welding Stress ◽  
Ansys Analysis ◽  
Urban Rail ◽  
Stress And Deformation

In the welding process, the welding strain and deformation of the city rail aluminum alloy flankwall are inevitable as a result of local heating, and carrying capacity of the structure will be affected by the welding stress and deformation. In the mean time, it puts forward some requirements for the clamp process, the clamping force can reduce the deformation of the workpiece. But a great change of force will produce in the clamp position during the process of welding, this force changes are easy to cause brittle fracture and fatigue damage of the clamp. In this paper, it gives simulation analysis to workpiece by using ANSYS analysis software and Gauss heat source model. Finally, the conclusion is sum up compared with the actual data.

Numerical Simulation and Infrared Measurement of Welding Temperature Field for T-Joint

2012 ◽  
Vol 548 ◽  
pp. 686-690
Author(s):  
Li Jia ◽  
Yong Zou ◽  
Zeng Da Zou
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Parametric Design ◽  
Source Model ◽  
Cooling Process ◽  
Heat Source Model ◽  
Welding Temperature ◽  
Practical Applications ◽  
Infrared Measurement ◽  
Ansys Parametric Design Language

The welding temperature field of T-joint was simulated by using ANSYS parametric design language (APDL), and infrared thermometers were used to measure the real-time temperature of the observation points during welding and cooling process. The simulation results match well with the measured results, which is indicated that the heat source model and the parameters used in this study is correct. The research results of this paper provide a basis and reference for further investigations and practical applications of numerical simulation for T-joints.

Geotechincal Assessment for Mitigation of a High-Pressure Pipeline Across Active Landslides: Design of a Directional Bore in Southern California

2008 ◽  
Author(s):  
Christopher S. Hitchcock ◽  
Richard W. Gailing ◽  
Scott C. Lindvall
Keyword(s):  
High Pressure ◽  
Slope Failure ◽  
Sufficient Information ◽  
Directional Drilling ◽  
Mitigation Options ◽  
Active Portion ◽  
Pressure Pipeline ◽  
Efficient Alternative ◽  
High Pressure Pipeline ◽  
Alternative Routes

Landslides are often a hazard to high-pressure gas transmission pipelines operating in hilly and mountainous terrain. Typical mitigation options include pipeline rerouting or removing the landslide from the pipeline, if possible. When rerouting or hazard removal is not a viable option due to terrain conditions or the size of the landslide loading the pipeline, directional bores can be used to place the pipeline beneath the active portion of the slope failure. As part of our study of the geotechnical viability of mitigation options for a pipeline impacted by coastal landslides, rerouting and landslide mitigation alternatives were fully investigated. Geologic interpretation of high-resolution, publicly available IfSAR and privately-flown LiDAR data were used to evaluate alternative routes around active and potentially active landslides. Geotechnical borings through the landslides ultimately provided sufficient information supporting directional drilling beneath the active landslides as the most efficient alternative, returning the pipeline to full service.

Reliability Based Design Optimisation of a “No Burst” High Pressure Pipeline

2002 ◽  
Author(s):  
Graham Stewart ◽  
Caroline Roberts ◽  
Ian Matheson ◽  
Malcolm Carr
Keyword(s):  
High Pressure ◽  
Structural Reliability ◽  
Design Stage ◽  
Design Parameters ◽  
Extreme Value Distributions ◽  
Reliability Based Design ◽  
Pressure Pipeline ◽  
Pipeline Wall ◽  
High Pressure Pipeline ◽  
Pipeline Design

The design philosophy of a pressure-protected subsea pipeline is intimately linked to the reliability of the Pressure Protection System (PPS) and to the probability of burst of the pipeline if it is exposed to full wellhead shut-in pressure. A reliability based design approach is presented that allows the pipeline wall thickness (and cost) to be reduced under the philosophy that the pipeline will “not burst” in the event of PPS failure. This paper describes how uncertainties in the pipeline design parameters may be initially modelled statistically to allow structural reliability techniques to be adopted at the design stage (before the pipe is manufactured). It further addresses how correlation of these parameters can be included and their extreme value distributions developed, which is particularly relevant as the length of the tieback increases. A method to incorporate inspection inaccuracy is also presented. The initial estimates of the design parameters necessarily err on the conservative side. These can be later updated when manufacturing data is available.

Modelling of Fluid Dynamics Interacting With Ductile Fraction Propagation in High Pressure Pipeline

2008 ◽  
Author(s):  
M. Popescu ◽  
W. Shyy
Keyword(s):  
Fluid Dynamics ◽  
High Pressure ◽  
Gas Flow ◽  
Flow Analysis ◽  
Time Discretization ◽  
Pressure Profile ◽  
Choked Flow ◽  
Pressure Pipeline ◽  
Crack Dynamics ◽  
High Pressure Pipeline

This paper presents a computational model for describing the behavior of the fluid dynamics in a fractured ductile pipe under high pressure. The pressure profile in front of the crack tip, which is the main source of the crack driving source, is computed by using nonlinear wave equation. The solution is coupled with one dimensional gas flow analysis behind the crack, choked flow. The simulation utilizes a high order optimized prefactored compact–finite volume method for space discretization, and low dispersion and dissipation Runge-Kutta for time discretization. As the pipe fractures the rapid depressurization take place inside the pipe and the propagation of the crack induce waves which strongly influence the nature of the outflow dynamics. Consistent with the experimental observation, the model predicts the expansion wave inside the pipe, and the reflection and outflow of the wave. The model also helps characterize the propagation of the crack dynamics and fluid flows around the tip of the crack.

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