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Steam Piping Fitness-for-Service Evaluation

[+] Author Affiliations
Robert S. Vecchio, Sri K. Sam Sinha

Lucius Pitkin, Inc.

Paper No. PVP2002-1308, pp. 31-41; 11 pages
  • ASME 2002 Pressure Vessels and Piping Conference
  • Fitness for Service Evaluations and Non-Linear Analysis
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4653-9
  • Copyright © 2002 by ASME


Recently, in the boiler room of a high-rise commercial building in New York City, a flash tank ruptured. As a result of dynamic loads generated during the explosion, steam piping in the boiler room was subjected to large displacements and severe vibrations. The building owner, concerned about the safety and integrity of the steam piping, requested an assessment of the piping and a fitness-for-service evaluation for continued operation. This paper presents a summary of the investigation performed including inspection of the piping, determination of operating and residual stresses, metallurgical evaluation and fitness-for-service assessment. A tolerable or critical pipe flaw size was established using the failure assessment diagram (FAD) method and, to the extent possible, the guidelines of API 579. Fracture mechanics evaluation and crack growth calculations were performed to establish re-inspection frequency for critical welds and pipe sections. Finally, nondestructive examinations were performed to determine which pipe sections and welds, if any, should be repaired or replaced.

Copyright © 2002 by ASME



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