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TECHNICAL PAPERS

Sealability of Stationary Metal-to-Metal Seals

[+] Author and Article Information
G. R. Murtagian, V. Fanelli, J. A. Villasante, D. H. Johnson, H. A. Ernst

Mechanical Technology Department, TENARIS-Siderca Center for Industrial Research, Dr. Simini 250, 2804, Campana, Buenos Aires, Argentina

J. Tribol 126(3), 591-596 (Jun 28, 2004) (6 pages) doi:10.1115/1.1715103 History: Received February 13, 2003; Revised October 24, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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References

ISO/DIS 13679 Norm, 2002, Petroleum and Natural Gas Industries—Procedures for Testing Casing and Tubing Connections.
Villasante, J. A., Murtagian, G. R., Fanelli, V., Johnson, D., and Ernst, H. A., 1998, “Ensayos de Sellabilidad en Probetas de Laboratorio Tipo Copa y Cono,” Informe CINI 1377/98.
Fanelli, V., Villasante, J. A., Murtagian, G. R., and Ernst, H. A., 1999, “Análisis de Datos Experimentales de los Ensayos de Sellabilidad en Probetas de Laboratorio Tipo Copa y Cono,” Informe CINI 1405/99.
Ernst, H. A., Fanelli, V., and Murtagian, G. R., 1998, “Modelo de Pérdidas para los Ensayos de Sellabilidad,” Informe CINI 1380/98.
Fanelli, V., 1999, “Criterio de Sellabilidad en Uniones de Tubos Petroleros,” Tesis de Maestria en Ciencia y Tecnologı́a de los Materiales, Instituto de Tecnologı́a, UNSAM Argentina.
Johnson, D. H., 1992, “API RP 5C5 Class Three Testings on Siderca SEC 3 1/2″ , 9.2#, L80 Tubing,” CINI Internal Report.
Benedetto, F., and Johnson, D. H., 1993, “Ensayos con Strain Gauges de Unión SEC 7″ , L80, Cargas Combinadas,” CINI Internal Report.
Silva, C, Daubian, P., Perrone, G., Nakoneczny, M., Johnson, D. H., and Ernst, H. A., 1998, “Qualification Test Program on Dalmine Premium Connection AMS 4 1/2″ , 12.6# SD 95 According to SIPM Procedure 92-0147(EP2),” CINI Internal Report
Assanelli, A., Toscano, R., and Dvorkin, E., 1997, “Finite Element Analysis of the AMS 9 5/8″ , 53.5# P110 Casing Connection,” CINI Report 1048/97.
Dvorkin, E., Assanelli, A., R. Toscano, R., and Calo, V., 1997, “Finite Element Analysis of the SEC 9 5/8″ , 53.5 PC 110 Casing Connection,” CINI Report 1091/97.
Assanelli, A., and Toscano, R., 1998, “Finite Element Analysis of the Antares MS 3 1/2″ , 12.7# P110 Connection,” CINI Report 1248/98.

Figures

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Schematic of a stationary metal-to metal seal on a tubular connection
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Typical pressurization (solid)/depressurization (hollow) LR curves for different Fn values. First test repetition.
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Iso-leakage curves in an Fn vs. Pgas plot for a leakage threshold level of 0.1 ml/hr, and leakage level of 30 ml/hr. Shift in the leakage curves due to surface load history.
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Seal surface aspect. Before test (left) and after
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Typical leakage curves obtained for test with use of SC
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Modeled Pc vs. normal applied force. R is a parameter.
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Leakage threshold data for a given Pgas on samples with use of SC. R indicated in ( ).
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Leakage threshold data for a given Pgas on samples without use of SC. R indicated in ( ).
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Example of a seal composed of three seal cells
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Family of Wac leakage threshold curves as a function of Pgas. Tests with SC.
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Sealability critical curve with use of SC
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Sealability critical curve without use of SC
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Example of P(l) profiles obtained by FEA for actual connections under different load cases
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Comparison between full-scale tests result and FEA with sealability model prediction

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