Assessment Criteria and Burst Pressure Prediction for Pipelines With Long Blunt Defects

2012 ◽  
Author(s):  
Xian-Kui Zhu ◽  
Brian N. Leis
Keyword(s):  
Yield Criterion ◽  
Theoretical Models ◽  
Ultimate Tensile Stress ◽  
Burst Pressure ◽  
Practical Applications ◽  
Average Shear Stress ◽  
Average Shear ◽  
Burst Data ◽  
Corrosion Defects ◽  
Von Mises

Corrosion assessment analysis and burst pressure prediction for an aged pipeline with blunt corrosion defects are essential to its integrity. It has been known that the flow stress based corrosion criteria including ASME B31G and PRCI RSTRENG are often conservative to use, but can be non-conservative in practical applications. The ultimate tensile stress based corrosion criteria such as PCORRC and LPC models largely improved the burst pressure prediction for corrosion defects, but the practice still showed certain non-conservatism of these newer models. This paper reviews and evaluates the commonly-used corrosion criteria. In order to improve the existing criteria for predicting burst pressure for long corrosion defects, three new theoretical models with consideration of strain hardening response for the corroded pipe are developed in terms of Tresca yield criterion, von Mises yield criterion, and a new multi-axial yield criterion, i.e., average shear stress yield criterion proposed recently by the present authors. The existing corrosion criteria and the proposed theoretical models are evaluated using experimental burst data for long machined defects and for long real corrosion defects removed from service. It is found that ASME B31G is over-conservative for long defects, but can be non-conservative for deep defects with intermediate lengths. RSTRENG is conservative for short defects. In contrast, PCORRC (or LPC) and the proposed ZL model predict reasonably conservative results for long corrosion defects.

Dynamic burst pressure analysis of cylindrical shells based on average shear stress yield criterion

2020 ◽  
Vol 148 ◽  
pp. 106498 ◽  
Author(s):  
Zhanfeng Chen ◽  
Xuyao Li ◽  
Wen Wang ◽  
He Yang ◽  
Zongfu Guo ◽  
...  
Keyword(s):  
Shear Stress ◽  
Yield Criterion ◽  
Cylindrical Shells ◽  
Burst Pressure ◽  
Average Shear Stress ◽  
Average Shear ◽  
Pressure Analysis

Determination of Burst Pressure for Line Pipes With Long Blunt Defects

2011 ◽  
Author(s):  
Xian-Kui Zhu ◽  
Brian N. Leis
Keyword(s):  
Yield Criterion ◽  
Maximum Load ◽  
Assessment Methods ◽  
Burst Pressure ◽  
Element Analysis ◽  
Integrity Assessment ◽  
Corrosion Defects ◽  
Corrosion Assessment ◽  
Von Mises

Burst pressure is the maximum load in a pipeline. Its accurate prediction is critical to the safety design, integrity assessment and operational management of the pipeline. This paper overviews the commonly-used corrosion assessment methods, including ASME B31G, Modified B31G, LPC and PCORRC criteria, and describes three theoretical solutions of burst pressure for defect-free pipes in terms of Tresca criterion, von Mises criterion and ZL criterion — a newly proposed average shear stress yield criterion and the associated flow rules. These three theoretical solutions are extended to those for corroded pipes with infinitely long corrosion defects. Followed this, an elastic-plastic finite element analysis is performed using the commercial software ABAQUS with an aim to demonstrate numerical determination of burst pressure corresponding to the Mises and ZL solutions. The corrosion assessment methods are then applied to evaluate the burst pressure for six corroded line pipes with real long corrosion defects. It is concluded that the ZL solution and the PCORRC criterion can determine reasonable and conservative predictions for corroded pipelines with very long corrosion defects.

Analytic Prediction of Plastic Collapse Failure Pressure of Line Pipes

2005 ◽  
Author(s):  
Xian-Kui Zhu ◽  
Brian N. Leis
Keyword(s):  
Experimental Data ◽  
Tensile Stress ◽  
Pipeline Steel ◽  
Ultimate Tensile Stress ◽  
Burst Pressure ◽  
Plastic Collapse ◽  
Pipeline Steels ◽  
Integrity Assessment ◽  
Present Solution ◽  
Von Mises

Accurate prediction of burst pressure of line pipes is essential for the safety design and integrity assessment of transmission pipelines. Different analytical and empirical formulae for determining the limit load of defect-free pipes have been proposed, but none is widely accepted and broadly validated. The commonly used method to determine the burst pressure by code in pipeline industry is based on the hoop stress of a pipe when it reaches a critical stress, such as flow stress or ultimate tensile stress of the pipeline steel. Recent experiments have shown that the criterion by code may be too conservative for modern high strength pipeline steels. Based on the plastic instability theory and the von Mises or Tresca yield criterion, theoretical solutions to predict the burst pressure of defect-free pipes have been proposed for years. However, it can be shown that experimental data for various pipeline steels lie between the two theoretical solutions of burst pressure of pressurized defect-free pipes, and fit the average result of the two solutions. In general, the von Mises prediction is the upper bound, and the Tresca prediction is the lower bound of burst pressure. Because traditional criteria like Mises and Tresca tend to bounded experimental data, a new failure criterion referred to as Average Shear Stress criterion is proposed. A plastic collapse analysis solution is developed as the corresponding theoretical solution of pipe limit pressure at plastic collapse. The new solution is formulated as a function of pipe geometry, strain hardening exponent and ultimate tensile stress of materials. Finite element results and experimental data are then introduced to validate the proposed solution. Comparisons indicate that the present solution matches the numerical results and the average experimental data of burst pressure of defect-free pipes for various pipeline steel grades.

Failure Pressure in Corroded Pipelines Based on Equivalent Solutions for Undamaged Pipe

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
M. Bony ◽  
J. L. Alamilla ◽  
R. Vai ◽  
E. Flores
Keyword(s):  
Shear Stress ◽  
Numerical Simulations ◽  
Wall Thickness ◽  
Yield Criteria ◽  
Failure Pressure ◽  
Average Shear Stress ◽  
Average Shear ◽  
Thin Walled ◽  
Von Mises

Simple and accurate approaches to predict failure pressures in corroded pipelines are outlined in this work. It is shown that failure pressures for corroded pipelines can be predicted from the solution for undamaged pipelines using an equivalent wall thickness. Three different yield criteria (Tresca, ASSY (average shear stress yield), and von Mises) are reviewed in the light of reported experimental burst pressures. At first, failure pressures for cylindrical vessels with an infinitely long groove are studied by means of numerical simulations. The effect of groove size (depth and width) over the pipeline performance is quantified through a model. Finally, the scheme is extended to estimate the failure pressure of thin walled vessels with irregular finite defects.

Evaluation of Burst Pressure of Corroded Pipe Segments Using Three-Dimensional Finite Element Analyses

2018 ◽  
Author(s):  
Ji Bao ◽  
Shulong Zhang ◽  
Wenxing Zhou ◽  
Shenwei Zhang
Keyword(s):  
Finite Element ◽  
Yield Criterion ◽  
Three Dimensional ◽  
Full Scale ◽  
Burst Pressure ◽  
Dimensional Finite Element ◽  
Tresca Criterion ◽  
Von Mises ◽  
Three Dimensional Finite Element ◽  
The Impact

In this paper, three-dimensional finite element models are developed to simulate full-scale burst tests of corroded pipes containing multiple naturally occurring corrosion anomalies. Both the von Mises and Tresca yield criteria and associated flow rules are employed in finite element analysis (FEA). For the Tresca criterion, the corresponding constitutive model subroutine is developed and incorporated in the FEA. The accuracy of FEA is investigated by comparing the burst pressures observed in the tests and corresponding burst pressures predicted using FEA. The implications of using the von Mises and Tresca criteria for the accuracy of the predicted burst pressure are investigated. Sensitivity analyses are also carried out to investigate the impact on the predicted burst pressure due to the mesh density in the corroded region, characterization of the geometry of the corrosion cluster and different types of element (e.g. solid and shell elements) used in FEA. The results suggest that the Tresca criterion always underestimates the burst pressure and the von Mises yield criterion predicts the burst pressure accurately. This study demonstrates the feasibility of using high-fidelity FEA and the Tresca yield criterion to simulate full-scale burst tests of corroded pipes and therefore establish a large database of burst pressure capacities of corroded pipes that can be used to develop an accurate, practical burst pressure capacity model amenable to the pipeline integrity management practice.

Finite Element Analysis of Burst Pressure for Pipelines With Long Corrosion Defects

2012 ◽  
Author(s):  
Xian-Kui Zhu ◽  
Brian N. Leis
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Criterion ◽  
Equivalent Stress ◽  
Theoretical Solution ◽  
Burst Pressure ◽  
Element Analysis ◽  
Integrity Assessment ◽  
Corrosion Defects ◽  
Von Mises

Plastic collapse analysis and remaining burst strength determination are critical to a corroded pipeline in its fitness-for-service analysis and integrity assessment. For very long corrosion defects, the present authors proposed a theoretical solution for predicting the burst pressure of corroded pipe in terms of a newly developed average shear stress yield theory, and validated it using full-scale burst data for long real corrosion defects. This paper then presents a finite element analysis (FEA) procedure to determine the remaining burst pressure for a very long blunt defect. A burst failure criterion that is referred to as von Mises equivalent stress criterion is proposed first in reference to the von Mises theory. Detailed elastic-plastic FEA calculations are performed using ABAQUS for a series of corroded pipes with infinitely long defects in different widths. From the FEA results and using the proposed failure criterion, the numerical results of burst pressure are determined for the long defects. The results show that using the proposed failure criterion, the FEA simulation can accurately determine the burst pressure for corroded pipes with long defects that is consistent with the theoretical solution. The conventional assessment methods including ASME B31G, RSTRENG, PCORRC and LPC are also evaluated and discussed in comparison with the proposed theoretical solution of burst pressure for long corrosion defects.

Deterministic and Probabilistic Analyses of Pipeline Burst Failure

2007 ◽  
Author(s):  
Xian-Kui Zhu ◽  
Brian N. Leis
Keyword(s):  
Experimental Data ◽  
Statistical Evaluation ◽  
Probability Of Failure ◽  
Burst Pressure ◽  
Deterministic Models ◽  
Average Shear Stress ◽  
Average Shear ◽  
Pipeline Failure ◽  
The Difference ◽  
Distribution Type

Deterministic and probabilistic analyses are carried out in this paper to investigate burst failure of defect-free pipelines. Three deterministic models for predicting the burst pressure of pipelines, i.e., the Tresca solution, the Mises solution and a newly developed Average Shear Stress Yield (ASSY) solution are used in statistical evaluation of experimental data of burst pressure, and in probabilistic analysis of pipeline failure. Monte Carlo simulation is adopted and programmed as Excel macros for calculating probability of failure. The results show that the ASSY solution is the best prediction of the experimental data, the Tresca and Mises solutions provide a lower bound and an upper bound, respectively. These three theoretical solutions can significantly affect the possibility of burst failure for pipelines, and the difference can be in several orders of magnitude. Validity of the modified ASME B31G and other criteria to predict the burst failure is examined, and influence of the probability distribution type of random variables on probability of failure for pipelines is also discussed.

scholarly journals Estimation of Burst Pressure of PVC Pipe Using Average Shear Stress Yield Criterion: Experimental and Numerical Studies

2021 ◽  
Vol 11 (21) ◽  
pp. 10477
Author(s):  
Jinhui Yang ◽  
Shaowei Hu
Keyword(s):  
Shear Stress ◽  
Water Pressure ◽  
Burst Pressure ◽  
Uniaxial Tensile ◽  
Predictive Tool ◽  
Average Shear Stress ◽  
Pipe Burst ◽  
Average Shear ◽  
Pvc Pipe ◽  
The Impact

Polyvinyl chloride (PVC) pipes have been extensively applied in water supply network fields. Understanding the mechanical properties and burst pressure of PVC pipes is necessary because a large number of pipes rupture due to excessive internal water pressure. In this paper, a practical approach based on the average shear stress yield (ASSY) criterion was proposed to assess the PVC pipe burst pressure. In addition, the PVC uniaxial tensile tests and the pipe burst tests were carried out to determine the material characteristic parameters and burst pressure of the PVC pipe. Furthermore, a finite element analysis (FEA) of PVC burst pressure was also performed based on the tangent intersection (TI) method to validate the proposed method and experimental results. Moreover, the impact of material parameters and pipe size, such as the strain hardening exponent and standard dimension ratio (SDR) on bursting pressure, were investigated. The comparison with the proposed theoretical model and the experimental and FEA results shows that the burst pressure derived from ASSY was consistent with the experimental data, with a relative error ranging from −2.76% to 2.65%, which is more accurate compared to other yield criteria. The burst pressure obtained by the ASSY approach declined with the increase of the hardening exponent n and increased with the increase of SDR. Therefore, the burst pressure solution-based ASSY proposed in this paper is an adequately suitable and precise predictive tool for assessing the failure pressure of PVC pipes.

Double circular arc model based on average shear stress yield criterion and its application in the corroded pipe burst

2017 ◽  
Vol 149 ◽  
pp. 515-521 ◽  
Author(s):  
Zhanfeng Chen ◽  
Sunting Yan ◽  
Hao Ye ◽  
Zhengzhi Deng ◽  
Xiaoli Shen ◽  
...  
Keyword(s):  
Shear Stress ◽  
Yield Criterion ◽  
Circular Arc ◽  
Average Shear Stress ◽  
Model Based ◽  
Arc Model ◽  
Pipe Burst ◽  
Average Shear
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