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Long-Term Leak Tightness of O-Ring Seals in the 9975 Shipping Package

[+] Author Affiliations
Elizabeth N. Hoffman, T. Eric Skidmore, William L. Daugherty

Savannah River National Lab, Aiken, SC

Paper No. PVP2010-25106, pp. 433-438; 6 pages
doi:10.1115/PVP2010-25106
From:
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 7
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4926-2 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME

abstract

O-ring seals in the 9975 shipping package containment vessels are fabricated from a Viton® GLT or GLT-S compound. Long-term testing of these O-rings has been performed to support service life predictions for packages used for long-term storage. Since the only criterion for O-ring performance is to maintain a leak-tight seal, leak testing is the primary indicator of service life. Fixtures have been aging at elevated temperatures to provide data for service life predictions. Limited leak test failures have been observed at the higher temperatures. This provides the opportunity for comparison to trends based on other O-ring properties, such as compression stress relaxation (CSR). Initial data suggest that the CSR data have some predictive value for a leak-tight service life, but other factors can complicate efforts to draw definitive conclusions.

Copyright © 2010 by ASME
Topics: Seals , Leakage

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