REVIEW OF AGING DATA ON EPDM O-RINGS IN THE H1616 SHIPPING PACKAGE

Skidmore, E.

关键词: AGING;    AIR;    ANTIOXIDANTS;    CONTAINERS;    CONTAINMENT;    GASKETS;    HYDROCARBONS;    LEAK TESTING;    MAINTENANCE;    MECHANICAL PROPERTIES;    PERFORMANCE;    SERVICE LIFE;    TESTING;   

DOI  :  10.2172/1037327
RP-ID  :  SRNL-STI-2012-00149
PID  :  OSTI ID: 1037327
Others  :  TRN: US201207%%419

学科分类：工程和技术（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Currently, all H1616 shipping package containers undergo annual re-verification testing, including containment vessel leak testing to verify leak-tightness (<1 x 10{sup -7} ref cc/sec air) as per ANSI N14.5. The purpose of this literature review is to supplement aging studies currently being performed by SRNL on the EPDM O-rings to provide the technical basis for extending annual re-verification testing for the H1616 shipping package and to predict the life of the seals at bounding service conditions. The available data suggest that the EPDM O-rings can retain significant mechanical properties and sealing force at or below bounding service temperatures (169 F or 76 C) beyond the 1 year maintenance period. Interpretation of available data suggests that a service life of at least 2 years and potentially 4-6 years may be possible at bounding temperatures. Seal lifetimes at lower, more realistic temperatures will likely be longer. Being a hydrocarbon elastomer, EPDM O-rings may exhibit an inhibition period due to the presence of antioxidants. Once antioxidants are consumed, mechanical properties and seal performance could decline at a faster rate. Testing is being performed to validate the assumptions outlined in this report and to assess the long-term performance of O-ring seals under actual service conditions.