D211 Investigation on Improvement and Practical Use of Pipe-Wall-Thinning Management : (1) Activity Plan of Research Committee and Current Status

2013 ◽  
Vol 2013.18 (0) ◽  
pp. 345-348
Author(s):  
Fumio Inada ◽  
Yutaka Watanabe ◽  
Taku Ohira ◽  
Akira Nakamura
Keyword(s):  
Pipe Wall ◽  
Current Status ◽  
Research Committee ◽  
Wall Thinning

Development of Analytical Evaluation Procedures and Acceptance Criteria for Pipe Wall Thinning in ASME Code Section XI

2004 ◽  
Author(s):  
Kunio Hasegawa ◽  
Gery M. Wilkowski ◽  
Lee F. Goyette ◽  
Douglas A. Scarth
Keyword(s):  
Pipe Wall ◽  
Evaluation Methodology ◽  
Current Status ◽  
Evaluation Procedure ◽  
Analytical Evaluation ◽  
Acceptance Criteria ◽  
New Class ◽  
Wall Thinning ◽  
Class 1 ◽  
Asme Code

As the worldwide fleet of nuclear power plants ages, the need to address wall thinning in pressure boundary materials becomes more acute. The 2001 ASME Code Case N-597-1, “Requirements for Analytical Evaluation of Pipe Wall Thinning,” provides procedures and criteria for the evaluation of wall thinning that are based on Construction Code design concepts. These procedures and criteria have proven useful for Code Class 2 and 3 piping; but, they provide relatively little flexibility for Class 1 applications. Recent full-scale experiments conducted in Japan and Korea on thinned piping have supported the development of a more contemporary failure strength evaluation methodology applicable to Class 1 piping. The ASME B&PV Code Section XI Working Group on Pipe Flaw Evaluation has undertaken the codification of new Class 1 evaluation methodology, together with the existing Code Case N-597-1 rules for Class 2 and 3 piping, as a non-mandatory Appendix to Section XI. This paper describes the current status of the development of the proposed new Class 1 piping acceptance criteria, along with a brief review of the current Code Case N-597-1 evaluation procedure in general.

State of the Art Study for the Basis of Pipe Wall Thinning Management in Japan

2013 ◽  
Author(s):  
Fumio Inada ◽  
Yutaka Watanabe ◽  
Taku Ohira ◽  
Akira Nakamura
Keyword(s):  
Pipe Wall ◽  
Liquid Droplet ◽  
Technical Knowledge ◽  
Research Committee ◽  
Accelerated Corrosion ◽  
Inspection Method ◽  
The Road ◽  
Road Map ◽  
Wall Thinning ◽  
New Findings

Main committee of Power Generation Facility Code (MCPGFC) of Japan Society of Mechanical Engineers (JSME) established rules to manage pipe wall thinning on 2005–2006, and they also made a roadmap in 2007 to enhance pipe wall thinning management rules. Research Committee on Application of New Findings and Technology to Improve Pipe-Wall-Thinning Management, which was conducted from April 2010 to March 2012 summarized the new draft technical knowledge of the major phenomena of pipe wall thinning, that is, flow accelerated corrosion and liquid droplet impingement erosion as well as new inspection method. In this report, the new technical knowledge is described. The achievement situation of the road map made in 2007 was evaluated, and the studies required in future were considered.

Theoretical and Experimental Investigation of Pipe Wall Thinning Detection Using Guided Waves

2008 ◽  
Author(s):  
Isoharu Nishiguchi ◽  
Fumitoshi Sakata ◽  
Seiichi Hamada
Keyword(s):  
Experimental Data ◽  
Power Generation ◽  
Experimental Investigation ◽  
Reflection Coefficient ◽  
Guided Waves ◽  
Pipe Wall ◽  
Thermal Power ◽  
Wall Thinning ◽  
Torsional Waves ◽  
Simplified Method

A method to investigate pipe wall thinning using guided waves has been developed for pipes in thermal power generation facilities. In this paper, the reflection coefficient and the transmission coefficient are derived for the torsional waves which propagate along a pipe and a simplified method to predict the waveform is proposed. The predictions of the waveforms by the FEM and a simplified method based on the reflection of torsional waves are also examined by comparing with experimental data.

scholarly journals Study of Mechanism and Modeling of Pipe Wall Thinning

2009 ◽  
Vol 51 (10) ◽  
pp. 740-744
Author(s):  
Kimitoshi YONEDA ◽  
Ryo MORITA ◽  
Kazutoshi FUJIWARA
Keyword(s):  
Pipe Wall ◽  
Wall Thinning
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