Flow-accelerated corrosion assessment for SA106 and SA335 pipes with elbows and welds

Nuclear Engineering and Technology

卷:53

Sung-Woo Kim¹  Dong-Jin Kim²  Se Beom Oh³  Jongbeom Kim³  Hong Pyo Kim³  Sung Hwan Cho³  Jong Yeon Lee³  Min Jae Choi³  Kyung Mo Kim³  Seong-Sik Hwang³  Gyeong Geun Lee³  Yun Soo Lim³ 

[1] Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI), 111, Daedeok-daero, 989 Beon-gil, Yuseong-gu, Daejeon, South Korea, 34057;

[2] Corresponding author.;

关键词: Flow-accelerated corrosion;    Pipe corrosion;    Orifice;    Elbow;    Weld;    Complicated fluid;   

DOI  :  

来源: DOAJ

【 摘 要 】

A FAC (flow-accelerated corrosion) test was performed for a straight pipe composed of the SA335 Gr P22 and SA106 Gr B (SA106-SA335-SA106) types of steel with welds as a function of the flow rate in the range of 7–12 m/s at 150 °C and with DO < 5 ppb at pH levels ranging from 7 to 9.5 up to a cumulative test time of 7200 h using the FAC demonstration test facility. Afterward, the experimental pipe was examined destructively to investigate opposite effects as well as entrance effects. In addition, the FAC rate obtained using a pipe specimen with a 50 mm inner diameter was compared with the rate obtained from a rotating cylindrical electrode. The effects of the complicated fluid flows at the elbow and orifice of the pipeline were also evaluated using another test section designed to examine the independent effects of the orifice and the elbow depending on the distance and the combined effects on orifice and elbow. The tests were performed under the following conditions: 130–150 °C, DO < 5 ppb, pH 7 and a flow rate of 3 m/s. The FAC rate was determined using the thickness change obtained from commercial room-temperature ultrasonic testing (UT).

【 授权许可】

Unknown