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Effect of solution concentration on ethylene propylene diene monomer (EPDM) nonmetallic components used in caustic liquid waste transfer lines

Journal Article · · Engineering Failure Analysis
 [1];  [2];  [2];  [2];  [2]
  1. Florida International Univ. (FIU), Miami, FL (United States); OSTI
  2. Florida International Univ. (FIU), Miami, FL (United States)
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The hose-in-hose transfer lines (HIHTL) used to transfer waste at the United States Department of Energy’s Hanford Site Tank Farm are fabricated from an ethylene propylene diene monomer (EPDM) synthetic rubber. During waste transport, these hoses are exposed to several stressors including caustic solutions at high temperatures and high pressures, as well as β and γ radiation. The aging behavior of HIHTL and dog-bone shaped EPDM specimens were evaluated by exposure to solutions at 77 °C containing 0.00, 6.25, 12.50, and 25.00 % (v/v) sodium hydroxide (NaOH) for 12-months. After the exposure, the material properties of the specimens were measured and compared to the unaged samples. The material properties evaluated included the tensile strength of the EPDM dog-bone samples and the burst pressure of the HIHTL. Both the tensile strength of the EPDM dog-bone samples and the burst pressure of the HIHTL specimens exposed to the 6.25 % NaOH solution exhibited the most significant deterioration and those exposed to 25.00 % NaOH solution had the least deterioration. Finally, examination of the HIHTL and the EPDM dog-bone specimens with scanning electron microscopy showed that the deterioration for the specimens exposed to 6.25 % NaOH solution were the most severe and the samples exposed to 25.00 % NaOH solution had the least deterioration.
Research Organization:
Florida International Univ. (FIU), Miami, FL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Environmental Management (EM)
Grant/Contract Number:
EM0000598
OSTI ID:
2418441
Alternate ID(s):
OSTI ID: 1907287
Journal Information:
Engineering Failure Analysis, Journal Name: Engineering Failure Analysis Vol. 145; ISSN 1350-6307
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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42 ENGINEERING
Aging of nonmetallic components
Ethylene propylene diene monomer (EPDM)
Radioactive liquid transfer
Sodium hydroxide