Browse > Article
http://dx.doi.org/10.3795/KSME-B.2013.37.11.1053

A Study on the Packing Friction Estimation of Power-Operated Valves in Nuclear Power Plants  

Ryu, Dong Hwa (Korea Hydro and Nuclear Power)
Lee, Young Shin (Dept. of Mechanical Engineering, Chungnam Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.11, 2013 , pp. 1053-1060 More about this Journal
Abstract
The purpose of this study is to estimate the packing friction of power-operated valve in nuclear power plants. The roll of packing in valve is preventing leakage through stem. Packing friction is highly depend on gland nut tightness which means higher reliability in sealing is lower operability. For the estimation of friction, we used statistical analysis and experimental analysis. In experimental approach, we have performed packing fY test and applied it to valve field test. In statistical approach, we have used 10 years DB of safety-related valve in nuclear power plant and analyzed packing friction based on confidence interval of sample. The comparison of two results shows that statistical analysis for packing friction are more accurate than fY analysis even though both approach have error compared to measured value but we confirmed that statistical approach is proper way to estimate packing friction.
Keywords
Packing; Stem Friction; Power-Operated-Valve; Confidence Interval;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 EPRI, 1988, "Valve Stem Packing Improvements," EPRI NP-5697
2 EPRI, 2002, "Valve Packing Performance Improvement: Sealing Technology & Plant Leakage Reduction Series," EPRI TR-1000923, pp. 5-2-5-4.
3 EPRI, 2006, "Compilation of COG Valve Packing Reports 2002-2003," EPRI 1013275.
4 Joseph, A. P., 2009, "Verification and Validation for the Smartseal Software Application V4.1," Insert Key Solutions, Inc., Chadds Ford, pp. 4-12.
5 Kim, D. W. and Yoo, S. Y. 2007, "Effects of Differential Pressure on the Performance of Motor Operated Flexible Wedge Gate Valve" Trans. Korean Soc. Mech. Eng. B, Vol. 31, No. 2, pp. 151-158.   DOI   ScienceOn
6 ASME B16 Committee, 2009, "Valves - Flanged, Threaded, and Welding End," ASME B16.24-2009, pp.184-187.
7 Minitab Inc., 2010, "Meet Minitab 16"