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Research Papers: Pipeline Systems

Nonlinear Contact Analysis of Different API Line Pipe Coupling Modifications

[+] Author and Article Information
Jeroen Van Wittenberghe

Laboratory Soete, Ghent University, St.-Pietersnieuwstraat 41, 9000 Ghent, Belgiumjeroen.vanwittenberghe@ugent.be

Patrick De Baets

Laboratory Soete, Ghent University, St.-Pietersnieuwstraat 41, 9000 Ghent, Belgiumpatrick.debaets@ugent.be

Wim De Waele

Laboratory Soete, Ghent University, St.-Pietersnieuwstraat 41, 9000 Ghent, Belgiumwim.dewaele@ugent.be

J. Pressure Vessel Technol 132(5), 051701 (Aug 31, 2010) (7 pages) doi:10.1115/1.4001220 History: Received September 15, 2009; Revised January 05, 2010; Published August 31, 2010; Online August 31, 2010

Threaded pipe couplings are used to join pipelines when they have to be uncoupled frequently or as an easy to assemble alternative to welding. A large variety of patented coupling modifications are available, but little is known about their influence on the connection’s behavior. In this study, the finite element model of an API line pipe threaded pipe connection is presented and its nonlinearities in material properties and contact behavior are discussed. Test results obtained from a four-point bending fatigue experiment are in good agreement with the results of the numerical simulations. A series of modifications of the standard connection are simulated to gain a better understanding in the influence of geometrical and material parameters on the connection’s performance. It was found that not all existing coupling modifications are improving the connection’s performance. It can be concluded that critical evaluation of the performance of existing coupling modifications is necessary and finite element analyses are proven to be a useful tool for this.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Finite element model of API Line Pipe connection

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Figure 2

Mesh of the finite element model

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Figure 3

Mesh detail of threads

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Figure 4

Stress distribution resulting from make-up

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Figure 5

Stress distribution resulting from make-up combined with an external axial tensile stress of 150 MPa

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Figure 6

Load distribution over the threads (numbering as in Fig. 1)

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Figure 7

Influence of the coefficient of friction μ on the thread opening

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Figure 8

Four-point bending setup

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Figure 9

Calculated axial strains versus axial strains measured by strain gauges

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Figure 10

(a) Fatigue crack initiated at the LET of the pin and (b) section view of the pin, arrows indicate root of the LET

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Figure 11

Box modifications: (a) stiffness gradient according to Ref. 3, (b) recess reduction, (c) waisted groove according to Ref. 4

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Figure 12

Influence of box stiffness gradient on the connection parameters

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Figure 13

Influence of box recess length variations on the connection parameters

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Figure 14

Influence on the connection parameters of variations of the primary angle of the box groove

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