Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 46, Issue 6
Displaying 1-7 of 7 articles from this issue
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Original Paper
  • Development of fatigue limit analysis diagram
    Fumio TAKAHASHI, Kotoji ANDO, Koji TAKAHASHI, Hideki OKADA, Masayuki O ...
    Article type: Original paper
    2008 Volume 46 Issue 6 Pages 344-351
    Published: November 25, 2008
    Released on J-STAGE: January 30, 2009
    DOIhttps://doi.org/10.11181/hpi.46.344
    JOURNAL FREE ACCESS
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    Development of Fatigue Limit Analysis Diagram: FLAD was conducted to estimate the fatigue limit of materials with a surface defect like a surface flaw. To make the FLAD, new criterion of cyclic plastic zone, based on Dugdale model, and cyclic Crack Tip Opening Displacement: CTOD, were proposed. The FLAD in this study considers the effect of stress ratio. Therefore, assuming the residual stress as the stress ratio, the shot peening effect was considered. The FLAD using new criterion was compared with literature data. As a result, the proposed FLAD concurred with experimental data despite differences in materials and stress ratios.
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  • Low cycle fatigue behaviors of elbow pipe containing local wall thinning
    Koji TAKAHASHI, Kotoji ANDO, Sota WATANABE, Masakazu HISATSUNE, Akitak ...
    Article type: Original paper
    2008 Volume 46 Issue 6 Pages 352-362
    Published: November 25, 2008
    Released on J-STAGE: January 30, 2009
    DOIhttps://doi.org/10.11181/hpi.46.352
    JOURNAL FREE ACCESS
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    Low cycle fatigue tests were conducted using 100A elbow specimens of STPT410 with local wall thinning. Local wall thinning was machined on the inside of elbow specimens in order to simulate erosion⁄corrosion metal loss. The local wall thinning areas were located at three different areas, called extrados, crown and intrados. The elbow specimens were subjected to cyclic in-plane bending under displacement control without internal pressure. The effects of eroded conditions, such as eroded ratio, eroded angle and position, on the low cycle fatigue behavior and fatigue life were discussed. Three-dimensional elasto-plastic analyses were also carried out using the finite element method, which could accurately predict the location of crack initiation and the crack growth direction. In addition, the safety margin of the eroded elbows against seismic loading was evaluated by comparing the fictitious stress of elbows and the design code against seismic loadings.
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  • Development of Test Equipment for Measuring Compression Characteristics of Sheet Gaskets at Elevated Temperature
    Toshimichi FUKUOKA, Masataka NOMURA, Takashi NISHIKAWA, Minoru ASAHINA
    Article type: Original paper
    2008 Volume 46 Issue 6 Pages 363-369
    Published: November 25, 2008
    Released on J-STAGE: January 30, 2009
    DOIhttps://doi.org/10.11181/hpi.46.363
    JOURNAL FREE ACCESS
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    Evaluation of the sealing performance of pipe flange connection is significantly important for the safety of pipe line structures. The compression characteristics of sheet gaskets primarily affect the mechanical behavior of flanged connections. It is well known that the stiffness of sheet gaskets substantially varies as the temperature is increased. Therefore, the compression test must be conducted at various levels of elevated temperatures. From the experimental point of view, however, a great difficulty is involved in measuring the compression characteristics of gaskets at elevated temperature. For this reason, a definite testing procedure has not yet been established.
    In this paper, a prototype of compression test equipment has been developed for measuring the stress-strain curves of sheet gaskets at elevated temperature. The test equipment is compact and the experiments can be conducted with fairly easy operation. It can control the gasket stress from zero to 30MPa while keeping the temperature of test specimen at different levels from room temperature to 300°C and higher. Aramid sheet gaskets are selected as test specimens. Experimental results show that the gasket stiffness drops with an increase in temperature. The relationships between gasket contact pressure and gasket strain could be successfully identified using the equations, which had been valid for room temperature conditions. It is concluded that the test equipment proposed here has a high promise to measure the stress-strain curves of sheet gaskets and estimate the sealing performance of pipe flange connections at elevated temperature.
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  • Application of Plastic Region Tightening Bolt to Flange Joint Assembly
    -Behavior of Bolt force in Flange Joint Subjected to Internal Pressure-
    Shinobu KANEDA, Hirokazu TSUJI
    Article type: Original paper
    2008 Volume 46 Issue 6 Pages 370-377
    Published: November 25, 2008
    Released on J-STAGE: January 30, 2009
    DOIhttps://doi.org/10.11181/hpi.46.370
    JOURNAL FREE ACCESS
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    Elastic region tightening by means of the torque control method is a conventional method to tighten bolts. The bolt force is controlled by a torque wrench; however, it is not easy to achieve constant bolt force. When the torque control method is applied to the flange joint assembly, the scatter of the bolt force is significant with respect to the joint reliability, such that it may cause leakage of the internal fluid from the flange joint. Recently, plastic region tightening has received considerable attention, which provides good uniformity in the bolt force. In a previous study, plastic region tightening was applied to a flange joint assembly, and the superior uniformity of the bolt force was demonstrated. The present paper describes the behavior of the plastic region tightening bolt in a flange joint subjected to internal pressure. First, the flange joint is tightened to the plastic region using a downsized bolt. The internal pressure is then applied to the flange joint, and the behavior of the additional bolt force is investigated.
    Application of plastic region tightening to the flange joint assembly is found to be effective for obtaining leak-free joints and for downsizing of the nominal diameter of the bolt. The behavior of the bolt force in a flange joint subjected to internal pressure was clarified. The additional bolt force has a sufficient margin for the allowable limit.
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Recture
  • Introduction of evaluation method based on RBM Handbook supposed to be issued by RBM Specialty Study Committee
    Hiroaki MASATOMO
    Article type: Lecture
    2008 Volume 46 Issue 6 Pages 378-383
    Published: November 25, 2008
    Released on J-STAGE: January 30, 2009
    DOIhttps://doi.org/10.11181/hpi.46.378
    JOURNAL FREE ACCESS
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    Recently, Risk Based Maintenance (RBM) or Risk Based Inspection (RBI) becomes popular not only in USA and Europe, but also in Japan. Still there is no practical RBM procedure suitable for Japanese plants because of the specific conditions depending on the kinds of industries.
    The WG-2 of RBM Specialty Study Committee of High Pressure Institute of Japan (HPI) had studied API-581 and other foreign standards like RIMAP for risk evaluation methods since 2001. And, WG-2 has been focusing on making RBM Handbook suitable to evaluate Japanese plants especially for the last these 3 years. The RBM Handbook is almost completed and supposed to be issued in 2008.
    In this paper, the procedure for applying RBM to the plants in Japan explained in the RBM Handbook is introduced.
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