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Research Papers: Design and Analysis

Strength Behavior of Hot-Tapped Pipeline Under Internal Pressure Load

[+] Author and Article Information
B. H. Wu, Z. F. Sang

Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, People’s Republic of China

Z. L. Wang

 Jiangsu Province Special Equipment Safety Supervision Inspection Institute, Nanjing 210000, People’s Republic of China

G. E. O. Widera

Center for Joining and Manufacturing Assembly, Marquette University, Milwaukee, WI 53233

J. Pressure Vessel Technol 133(5), 051205 (Jul 14, 2011) (8 pages) doi:10.1115/1.4003460 History: Received March 08, 2010; Revised December 15, 2010; Published July 14, 2011; Online July 14, 2011

The objective of this study is to investigate the strength behavior and plastic limit pressure of hot-tapped pipelines under an internal pressure load. Two full scale test models were fabricated for the experiment. A three-dimensional nonlinear finite element analysis was also carried out. The plastic limit pressure was determined approximately by use of the twice the elastic-slope criterion. The results indicate that plastic limit pressures obtained by experiment and finite element analysis are in good agreement. On the basis of the above results, a parametric analysis of the plastic limit pressure was carried out and resulted in the development of formulas useful for the design of hot-tapped pipelines.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

In-service welding of test models

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Figure 2

Structure of test models: (a) without a pad and (b) with a pad

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Figure 3

Weld structure of test models: (a) without a pad and (b) with a pad

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Figure 4

Location and distribution of strain gauges

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Figure 5

Data acquisition system and Model N1 during testing

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Figure 6

Stress distribution of Test Model N1: (a) longitudinal section and (b) transverse section

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Figure 7

Stress distribution of Test Model N2: (a) longitudinal section and (b) transverse section

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Figure 8

Typical pressure-strain curves and corresponding limit pressures by test: (a) Test Model N1 and (b) Test Model N2

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Figure 9

Finite element mesh of analysis models: (a) Model N1 and (b) Model N2

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Figure 10

Multilinear elastic-plastic material model

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Figure 11

Stress distribution from FEA of Model N1: (a) longitudinal section and (b) transverse section

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Figure 12

Stress distribution from FEA of Model N2: (a) longitudinal section and (b) transverse section

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Figure 13

Pressure-strain plots and limit pressure by FEA: (a) Test Model N1 and (b) Test Model N2

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