NDLI: Improving the Accuracy of Traditional Dent Fatigue Analysis: A Method for Quantifying the Initial Damage Caused by Dent Formation

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Modeling Pipeline Metal Loss Defects at Tool Speed

Failure Assessment of the Gas Pipeline by Considering the Geometric Constraint Effect

Identifying Stress Concentrations on Buried Steel Pipelines Using Large Standoff Magnetometry Technology

Directional Caliper Tool Development

Validate Crack Assessment Models With In-Service and Hydrotest Failures

Non-Contact Geomagnetic Localization of Pipeline Defects Using Empirical Mode Decomposition and Magnetic Gradient Tensor

Evaluation of Corrosion Growth Prediction Methodologies Using Burst Pressure Comparisons From Repeated In-Line Inspections

An Investigation Into the Benefits of Employing Multiple Assessments Methods for High Risk Pipelines

EMAT As a Basis for a Comprehensive System Wide Crack Management Program

Structure Assessment Using Instrumented Indentation: Strength, Toughness and Residual Stress

Operational Experiences With Axial Strain Inline Inspection Tools

Do You Have Wrinkles? A Strain- and Stress-Based Approach for the Assessment of Wrinkles Reported by In-Line Inspection

In-Line Inspection in Lieu of Hydrostatic Testing for Low Frequency Electric Resistance Welded Pipe

Implementation of a New Tool for Pipelines Integrity Evaluation: A Correlation Between Local Strains and Hardness

A Sensitivity Study: Effects of Toughness Values on Fatigue Crack Growth Analysis of Just-Survived Flaws Following a Pressure Test

Exceeding Limitations: Ultrasonic Crack Inspections Become Feasible for Liquid Natural Gases

Breathing New Life to Aging Pipeline Infrastructure Using Unique Wireline Inspection Techniques and Pipe-Lining Technology

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Algorithms for the Strain Based Analysis of Dented Pipelines

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Some Factors Affecting Initiation of Stress Corrosion Cracking of an X80 Pipe Steel in Near-Neutral pH Environment

Complex Circumferential Stress Corrosion Cracking: Identification, Sizing and Consequences for the Integrity Management Program

Crack Shape Development for Leak-Before-Break Analysis in Pipelines

Implementation of Reliability-Based Criteria for Corrosion Assessment

Study of Safe Dig Pressure Level for Rock Dents in Gas Pipelines

Improving the Accuracy of Traditional Dent Fatigue Analysis: A Method for Quantifying the Initial Damage Caused by Dent Formation

Evaluation of Crack Growth and Material Toughness Effects on Probability of Pipeline Failure

Influence of Mean Load Pressure Fluctuations on Crack Growth Behavior in Steel Pipelines

Fracture Toughness Testing and its Implications to Engineering Fracture Mechanics Analysis of Energy Pipelines

Determining Pipeline Depth of Cover at River Crossings by Data Integration

Buried Pipe Span Ovality Assessment

Effect of Residual Stress or Plastic Deformation History on Fatigue Life Simulation of Pipeline Dents

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Improving the Accuracy of Traditional Dent Fatigue Analysis: A Method for Quantifying the Initial Damage Caused by Dent Formation

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Turnquist, Michael Parsons, Adam
Copyright Year	2018
Abstract	The pipeline industry is currently taking several approaches to evaluate the integrity of dents, ovalities, or other geometric anomalies identified from in-line inspection (ILI). A primary threat associated with these features that operators should be concerned with is failure due to fatigue. In order to carry out a more accurate dent fatigue analysis, it is important to be able to quantify the amount of damage accumulated during the initial dent formation process and subsequent shakedown of the dent. Dents result from permanent deformation of the pipeline which leads to accumulation of plastic strain. Whether this permanent deformation was caused during initial construction (a backhoe striking the pipeline) or in service (changing underground soil conditions), the plastic strains that are observed will result in a decrease in the pipeline’s fatigue life. Pressure cycling has the potential to accumulate additional plastic stain, thus accumulating more fatigue damage. Eventually as the pipeline continues to be cycled, no additional deformation or accumulation of plastic strain will occur; this behavior is referred to as “shakedown.” Finite element analysis (FEA) can be utilized to quantify how much fatigue damage has been accumulated during the initial dent formation process and subsequent shakedown of the dent. When analyzing pipeline dents using FEA, importance should be placed on accurately simulating the dent forming process so that realistic plasticity effects can be captured. The process of calculating plastic stresses and strains during the dent forming process can be computationally expensive and result in numerical instabilities within the analysis. As a result, methods for simulating the formation and shakedown of a pipeline dent are continuously being refined. However, since it is difficult to determine exactly how these geometric pipeline anomalies were formed, the applicability and accuracy of such methods contains a great amount of uncertainty and is thus expensive (both from a cost and time standpoint) for an operator to validate. This paper will identify a new and innovative approach for using FEA to determine the amount of damage accumulated during the initial dent formation process and subsequent shakedown of the dent. This approach uses state-of-the-art FEA modeling techniques coupled with industry knowledge and experience to develop an accurate and efficient method for quantifying this damage. The knowledge gained during this analysis can be used in conjunction with a traditional rapid dent assessment methodology. A case study will be presented which demonstrates the impact that a direct calculation of this initial damage has on representative pipeline dent assessment analysis. By undertaking this additional analysis, operators will have the potential to eliminate unnecessary digs. Additionally, operators can be more confident that their resources are being applied to the highest priority features.
Sponsorship	Pipeline Division
File Format	PDF
ISBN	9780791851869
DOI	10.1115/IPC2018-78684
Volume Number	Volume 1: Pipeline and Facilities Integrity
Conference Proceedings	2018 12th International Pipeline Conference
Language	English
Publisher Date	2018-09-24
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Fatigue life Construction Uncertainty Deformation Pipelines Inspection Fatigue Fatigue analysis Modeling Pressure Stress Plasticity Soil Finite element analysis Damage Fatigue damage Failure
Content Type	Text
Resource Type	Article

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