DOI QR코드

DOI QR Code

Applicability of the induction bending process to the P91 pipe of the PGSFR

  • Kim, Nak Hyun (Versatile System Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Jong Bum (Versatile System Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Sung Kyun (Versatile System Technology Development Division, Korea Atomic Energy Research Institute)
  • Received : 2020.06.16
  • Accepted : 2020.10.29
  • Published : 2021.05.25

Abstract

The application of induction bending processes to industrial pipe production is increasing. The induction bending process has the effect of reducing the number of inspections and preventing leaks by reducing the weld of the pipe. For these reasons, efforts have been made to apply an induction bending process to the pipe of the PGSFR under development in Korea and this is the first attempt in the SFR design. Since the PGSFR pipe has a relatively large diameter-to-thickness ratio, it is difficult to fabricate an induction bending pipe that meets the requirements. In addition, the material properties may change because the pipe heats to a very high temperature during the induction bending process. In this study, P91 pipes were fabricated by induction bending, and the results from analyzing the induction bending process' applicability to the P91 pipe of the PGSFR are examined. The various dimensional measurements of the pipes fabricated by the induction bending process were surveyed to determine whether the requirements of the ASME Code were met. The minimum thickness, ovality, and wall buckling measured in the fabricated pipe met all the requirements. Tensile, impact, and hardness tests at various locations of the fabricated pipe also satisfied the requirements.

Keywords

Acknowledgement

This work was supported by the Nuclear Research & Development Program of the National Research Foundation with a grant funded by the Korea Ministry of Science and ICT (No. 2012M2A8A2025633) ans the National Council of Science & Technology (NST) grant by the Korea government (MIST) (No. CAP-20-03-KAERI).

References

  1. J.W. Yoo, J.W. Chang, J.Y. Lim, J.S. Cheon, T.H. Lee, S.K. Kim, K.L. Lee, H.K. Joo, Overall system description and safety characteristics of Prototype gen IV sodium cooled Fast reactor in Korea, Nuclear Engineering and Technology 48 (2016) 1059-1070. https://doi.org/10.1016/j.net.2016.08.004
  2. Y.I. Kim, Y.B. Lee, C.B. Lee, J.W. Chang, C.W. Choi, Design concept of advanced sodium-cooled Fast reactor and related R&D in Korea, Science and Technology of Nuclear Installations (2013), 290362. Article ID, 18 pages, 2013.
  3. H.W. Lee, J.H. Bae, M.S. Kim, C. Kim, Optimum design of pipe bending based on high-frequency induction heating using dynamic reverse moment, Int. J. Precis. Eng. Manuf. 12 (2011) 1051-1058. https://doi.org/10.1007/s12541-011-0140-6
  4. N.I. Kim, Y.S. Kim, K.S. Kim, H.Y. Chang, H.B. Park, G.H. Sung, Effects of induction heat bending process on microstructure and corrosion properties of ASME SA312 Gr.TP304 stainless steel pipes, Corros. Sci. Technol. 14 (2015) 120-126. https://doi.org/10.14773/cst.2015.14.3.120
  5. K.T. Kim, Y.S. Kim, H.Y. Chang, Y.J. Oh, G.H. Sung, Effect of induction heat bending process on the properties of ASME SA106 Gr. C carbon steel pipes, Corros. Sci. Technol. 14 (2015) 47-53. https://doi.org/10.14773/cst.2015.14.2.47
  6. X. Guo, K. Jin, H. Wang, W. Pei, F. Ma, J. Tao, N. Kim, Numerical simulations and experiments on fabricating bend pipes by push bending with local induction-heating process, Int. J. Adv. Manuf. Technol. 84 (2015) 2689-2695.
  7. ASME B16.9, Factory-made Wrought Buttwelding Fittings, The American Society of Mechanical Engineers, 2001.
  8. ASME Boiler and Pressure Vessel Code, Section III, Division 1, Subsection NB, ASME International, 2017.
  9. ASME Boiler and Pressure Vessel Code, Section II, Part A, ASME International, 2017.
  10. PFI standard ES-24, Pipe Bending Methods, Tolerances, Process and Material Requirements, Pipe Fabrication Institute, 2010.
  11. ASME B31.1, Power Piping, The American Society of Mechanical Engineers, 2007.
  12. ASME Boiler and Pressure Vessel Code, Section II, Part D, ASME International, 2017.
  13. ASME Boiler and Pressure Vessel Code, Section III, Division 5, ASME International, 2017.
  14. ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products, ASTM International, 2016.
  15. ASTM E21, Standard Test Methods for Elevated Temperature Tension Tests of Metallic Materials, ASTM International, 2017.
  16. ASTM E92, Standard Test Methods for Vickers Hardness and Knop Hardness of Metallic Materials, ASTM International, 2017.