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Failure analysis on synergistic effect of erosion and corrosion on failed fittings in specialty chemical plant. Part II: Control valve
Author(s) -
Yang XiaoLei,
Wang ShengHui,
Fei JingLu,
Gong Yi,
Yang ZhenGuo
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201810582
Subject(s) - control valves , erosion corrosion , corrosion , chemical plant , boiler (water heating) , environmental science , forensic engineering , engineering , materials science , metallurgy , waste management , mechanical engineering , environmental engineering
Failure analysis was carried out on a control valve in the steam system of a specialty chemical plant. Comprehensive analyses were conducted to investigate the operating conditions, base materials, macroscopic, and microscopic morphologies of the failed steam control valve and a computational fluid dynamic model was also adopted. The results showed that the synergistic effect of electrochemical corrosion favored by chlorides and two phase flow erosion accounted for the premature failure of the steam control valve. Considering the fact that the valve was designed by a German company, assembled by an American company and used in a Chinese company, our failure analysis seems to be crucial for the imputation of the responsibility. The failure mechanisms were discussed and the relevant countermeasures were proposed to prevent the occurrence of similar failure again.