NDLI: Effect of Crack Depth on Burst Strength of X70 Linepipe With Dent-Crack Defect

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Volume 3: Operations, Monitoring and Maintenance; Materials and Joining

Volume 1: Pipelines and Facilities Integrity

Failure Along Spiral Welds in Gas Pipeline

Numerical Simulations of Burst of Corroded Pipes With Thermally Induced Compressive Axial Strain

Formulation and Experimental Validation of a New Erosion Flow Model

Applying Corrosion Growth Rates Derived From Repeat ILI Runs to Predict Future Severity

Effect of Crack Depth on Burst Strength of X70 Linepipe With Dent-Crack Defect

Relative Statistical Calibration of ILI Measurements

Assessment of In-Line Inspection Performance and Interpretation of Field Measurements for Characterization of Complex Dents

Findings From an Investigation of Hydrotest Protocols

Experimental Validation of a Finite-Element Model to Simulate an Impact on Pipeline due to Vehicles or Heavy Object Fall

The Development and Use of an Absolute Depth Size Specification in ILI-Based Crack Integrity Management of Pipelines

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Thermal Response of Gas Pipeline Metal to Gas Decompression

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Probabilistic Assessment of Crack Detection ILI Effectiveness for Managing Stress Corrosion Cracking on Buried Pipelines

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A Life-Cycle Approach to the Assessment of Pipeline Dents

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Improvement of Pipeline Fatigue Life Estimation

Evaluation of Fatigue in Gas Pipelines

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Effect of Crack Depth on Burst Strength of X70 Linepipe With Dent-Crack Defect

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ghaednia, Hossein Das, Sreekanta Zohrehheydariha, Jamshid Wang, Rick Kania, Richard
Copyright Year	2016
Abstract	External interferences cause various defects, which significantly affect the transportation of oil and gas in pipelines. Corrosion, crack, puncture, dent, gouge, and combination of such damages from a variety of external interferences are some common examples of surface damage in pipelines. Gouges, dents, cracks, and punctures that form in the pipe wall as a result of contact and/or impact from foreign objects are often referred to as mechanical damage. Structural integrity of oil and gas transmission pipelines is often threatened by these mechanical damages and as a result, a failure of the pipeline may occur. A defect that contains both dent and crack, often known as dent-crack defect, may lead to a rupture or leak in the pipe wall. This kind of defect is a matter of serious concern for the pipeline operator since a rupture or a leak may occur. Hence, an experimental study was completed at the Centre for Engineering Research in Pipelines (CERP), University of Windsor on 30 inch (762 mm) diameter and X70 grade pipes with D/t of 90. This project was undertaken through laboratory based experimental work and numerical study using non-linear finite element analysis (FEA) method. The purpose of full-scale test was to collect test data to be able to validate finite element (FE) model. The validated FE model was then used to undertake parametric study for determining the effect of the crack depth and operating (internal) pressure on the burst strength of NPS30 X70 grade oil and gas pipe. The parameters chosen in the FE based parametric study are: (1) crack depth which was varied from 0.25 to 0.75 of pipe wall thickness and (2) internal pressure applied during denting process (operating pressure of linepipe) was varied from no internal pressure to 0.75py. This study found that the dent-crack defect with crack depth of 75% of wall thickness could reduce the pressure capacity by 54%.
Sponsorship	Pipeline Division
File Format	PDF
ISBN	9780791850251
DOI	10.1115/IPC2016-64098
Volume Number	Volume 1: Pipelines and Facilities Integrity
Conference Proceedings	2016 11th International Pipeline Conference
Language	English
Publisher Date	2016-09-26
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Leakage Pipelines Rupture Fracture (materials) Chisels Wall thickness Pressure Transportation systems Finite element model Corrosion Engineering research Finite element analysis Damage Pipes Failure
Content Type	Text
Resource Type	Article

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