All issues
Volume 44 (2006)
- Issue 6 Pages 322-
- Issue 5 Pages 248-
- Issue 4 Pages 174-
- Issue 3 Pages 124-
- Issue 2 Pages 68-
- Issue 1 Pages 3-
Predecessor
Volume 44, Issue 5
Displaying 1-5 of 5 articles from this issue
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Original Paper
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Waichi IWASAKI, Masahiro OTA2006 Volume 44 Issue 5 Pages 248-255
Published: 2006
Released on J-STAGE: November 10, 2006
JOURNAL FREE ACCESSThe energy conversion efficiency of PEM electrolysis for H2 supply station was examined by verification test equipment. A high temperature electrolysis was also evaluated for purpose of reduction of power consumption using exergy diagram. A characterization of hydrogen energy was estimated by calculating Japanese power demand forecast with exhaustion of fossil fuels in mind. Also thermal power plant efficiency was calculated to put through Kyoto Protocol goal. Furthermore, water splitting by solar energy was considered for sustainable energy.View full abstractDownload PDF (424K) -
Naoya KASAI, Kazuyoshi SEKINE, Kimiyasu KATOH2006 Volume 44 Issue 5 Pages 256-262
Published: 2006
Released on J-STAGE: November 10, 2006
JOURNAL FREE ACCESSIn this study, the detection of fatigue damage accumulation and hydrogen embrittlement in 7075 alloy was confirmed using the eddy current method. Fatigue damage and hydrogen charging were accumulated in notched specimens, and then changes in amplitude and phase were measured in the specimens using eddy current testing. The maximum values of the signals were observed at an area where fatigue damage and hydrogen charging were accumulated. The experimental results correlated with accumulation of fatigue damage and hydrogen charging in the specimens. Therefore, the possibility of using this method for the quantitative evaluation of fatigue damage accumulation and hydrogen embrittlement in aluminum alloys is presented.View full abstractDownload PDF (360K)
Review
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Hirokazu TSUJI2006 Volume 44 Issue 5 Pages 263-270
Published: 2006
Released on J-STAGE: November 10, 2006
JOURNAL FREE ACCESSAsbestos products including gaskets will be completely prohibited in several years due to their toxicity. In order to solve some difficulties in the substitution for the asbestos gaskets, STOP (Sealing technology of pressure equipments) committee is in the investigation activity. Development of a series of standards is essential to the solution of difficulties, such as new flange joint design methodology that the amount of leakage can be taken into consideration, test method for the sealing behavior of the gaskets, and bolt tightening guidelines for flanged joint assembly. The regulation against the asbestos and the development of the standards including two standards published as HPIS are overviewed.View full abstractDownload PDF (269K) -
Part 2 Study on various assessment procedures and margin for failureYoshiro IDEGUCHI, Yoichi ISHIZAKI, Takayasu TAHARA2006 Volume 44 Issue 5 Pages 271-286
Published: 2006
Released on J-STAGE: November 10, 2006
JOURNAL FREE ACCESSFitness-for-Service (FFS) assessments are quantitative engineering evaluations that are performed to determine the structural integrity of an in-service component and can be used to make run-repair-replace decisions to help determine pressurized equipment containing flaws that have been identified by inspection can continue to operate safety for some period of time.
This report provides an interpretation of general and local metal loss assessment procedures which are specified in FFS assessment procedure developed by PAJ⁄JPCA FFS task group based on API RP579 with following three parts
Part 1 Overview of FFS assessments and fundamental technology of metal loss assessment
Part 2 Study on various assessment procedures and margin for failure
Part 3 Comparison of metal loss assessment procedures based on FEM analysis
The following article is the Part 2 “our study on various assessment procedure and margin failure” of the series that reports our study on WRC LLL and ASME PVP2000 presentation, both were developed by Dr. D. A. Osage who is the leading figure of API579.View full abstractDownload PDF (797K)
Lecture
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Shigemitsu KIHARA, Kengo ISHIGE, Akira OHTOMO2006 Volume 44 Issue 5 Pages 287-294
Published: 2006
Released on J-STAGE: November 10, 2006
JOURNAL FREE ACCESSThe relation between material properties and risk of various structures is discussed. The risk is defined by the product of [Likelihood of failure] and [Consequence of failure]. The likelihood of failure which strongly depends on the material properties is discussed for design⁄fabrication and operation⁄maintenance processes respectively.
In the process of design⁄fabrication the risk is mainly avoided by design margin. The design margin for pressure vessel is involved in allowable stress for material. In the case of ASME boiler & Pressure Vessel Code the allowable stress is fixed as the value of minimum tensile strength divided by 3. 5 (design margin) . The value of design margin is set to avoid ductile, brittle and fatigue fractures.
In the operation⁄maintenance process, the structures designed with enough margin can be failed by time dependent fracture mechanisms, fatigue, creep, corrosion, erosion and metallurgical degradation. The time dependent fracture must be controlled by residual life evaluation and inspection (monitoring) .
RBI (Risk Based Inspection) and FFS (Fitness For Service) are going to be applied as new maintenance methods. The application of these methods can be promoted by the establishment of material property data, life evaluation and inspection techniques.View full abstractDownload PDF (164K)
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