Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Flow-accelerated corrosion assessment for SA106 and SA335 pipes with elbows and welds

  • Kim, Dong-Jin (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Sung-Woo (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Lee, Jong Yeon (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Kyung Mo (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Oh, Se Beom (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Lee, Gyeong Geun (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Jongbeom (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Hwang, Seong-Sik (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Choi, Min Jae (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Lim, Yun Soo (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Cho, Sung Hwan (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Hong Pyo (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute (KAERI))
  • Received : 2020.09.04
  • Accepted : 2021.03.24
  • Published : 2021.09.25
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Abstract

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 ℃ 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 ℃, 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).

Keywords

Acknowledgement

This work was financially supported by the Korean Nuclear R&D Program organized by the National Research Foundation (NRF) with support from the Ministry of Science and ICT (2017M2A8A4015155) and by the R&D Program of the Korea Atomic Energy Research Institute (KAERI).

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