Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 56, Issue 3
Displaying 1-4 of 4 articles from this issue
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Original Paper
  • Sealing Performance Evaluation for Metal Flat Gasket under Leak Test with Platens
    Yuya OMIYA, Masahiro FUJII, Yuta SHIBAI
    2018 Volume 56 Issue 3 Pages 120-127
    Published: May 25, 2018
    Released on J-STAGE: June 28, 2018
    DOIhttps://doi.org/10.11181/hpi.56.120
    JOURNAL FREE ACCESS
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    Pipe flange connection with metal gasket is used under elevated temperature and pressure, and required high sealing performance. It has been known that gasket compressive force, that is closely related the leakage, is decreased due to internal pressure. The sealing performance evaluation in the case with internal pressure is important since the pressure is very high in metal gaskets. However, there is only a few researches that evaluates a leakage, metal gasket is empirically used up to the present time. Therefore, evaluated sealing performance of metal gasket, it is necessary to clarify the sealing mechanism. In this study, evaluated effect that decreasing of gasket compressive force affects leakage on metal flat gasket by simplified leak test and finite element method stress analysis, evaluation method of leakage in metal gasket is proposed. Based on this evaluation method, decision method of compressive force that guaranteed one amount of leakage to design internal pressure was shown with metal gasket.
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  • Evaluation of Durability of SCM435 Steel for High-pressure Hydrogen System by Slow Strain Rate Technique with Cathodically Hydrogen Charged Specimen
    Daichi TSURUMI, Hiroyuki SAITO, Hirokazu TSUJI
    2018 Volume 56 Issue 3 Pages 128-135
    Published: May 25, 2018
    Released on J-STAGE: June 28, 2018
    DOIhttps://doi.org/10.11181/hpi.56.128
    JOURNAL FREE ACCESS
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    As an alternative method to evaluation of slow strain rate technique (SSRT) under high-pressure hydrogen gas, SSRT tests were performed with a cathodically charged specimen. Cathodic charging was performed in 3% NaCl aqueous solution with pH=6 and at a current density of 50 to 600 A⁄m2. Cr-Mo low alloy steel with a tensile strength of 1000 MPa grade was selected as a test material. Relative reduction of area (RRA) values obtained by tests with continuous charge at a cathode current density of400 A⁄m2 were equivalent to those performed in hydrogen gas at pressure of 100 MPa. Fracture surface observations were also performed using scanning electron microscopy (SEM) . The quasi-cleavage fracture surface of hydrogen embrittlement (QCHE) was observed near the surface of specimen that were subjected to continuously hydrogen charged tests. It was necessary to charging hydrogen during a certain level of plastic deformation to form the QCHE. The results show that to simulate the high-pressure hydrogen gas test, it was necessary to perform the hydrogen-charged until rupture.
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Review
  • On the Protruding Length of Bolt Thread After Bolt Tightening
    Hiroshi YAMANAKA, Tsutomu KIKUCHI
    2018 Volume 56 Issue 3 Pages 136-141
    Published: May 25, 2018
    Released on J-STAGE: June 28, 2018
    DOIhttps://doi.org/10.11181/hpi.56.136
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    After tightening a bolt, technical knowledge on how far the thread of the bolt should protrude from the nut is not organized. Therefore, in addition to the surveys of existing standards, surveys were conducted in consideration of thread strength at bolt tightening, sealing performance of flange joints, and corrosion. As a result, it was found that the protruding length of the screw thread of the bolt had little influence on the strength of the screw and the sealing performance of the flange joint. However, if it is below flush with nut face, there is a possibility of promoting corrosion by dust and moisture, so one or more protrusion lengths may be required.
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  • Incidents of Storage Facilities for Energy Products Occurred Overseas in 2017
    Shoichi YOSHIDA
    2018 Volume 56 Issue 3 Pages 142-157
    Published: May 25, 2018
    Released on J-STAGE: June 28, 2018
    DOIhttps://doi.org/10.11181/hpi.56.142
    JOURNAL FREE ACCESS
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    The author has reported incidents of storage facilities for energy products in the EST-1 Committee of High Pressure Institute of Japan. The information was obtained from the Internet when the incidents occurred. In this paper, 63 incidents of storage facilities for energy products which occurred overseas in 2017 are reported.
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