Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
Volume 45, Issue 6
Displaying 1-5 of 5 articles from this issue
Original Paper
  • Toshio TAKANO, Masanori MONDE, WOODFIELD Peter
    2007 Volume 45 Issue 6 Pages 336-344
    Published: 2007
    Released on J-STAGE: December 28, 2007
    JOURNAL FREE ACCESS
    An experiment has been made to measure hydrogen temperature in an actual vessel during charging hydrogen until 35 MPa and 70 MPa at a different charging time and also to measure the temperature in a discharging bank at the same time. The measured temperatures of hydrogen for the vessel and bank are compared with the estimated temperature from the previous model proposed by authors. It reveals that the estimated temperature is in good agreement with the measured one and the effects of inlet enthalpy and thermal capacity of the tank on the temperature increase are made clear.
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  • Masami OSHIMA, Kazuyoshi SEKINE
    2007 Volume 45 Issue 6 Pages 346-356
    Published: 2007
    Released on J-STAGE: December 28, 2007
    JOURNAL FREE ACCESS
    As the tank fires at Tokachioki earthquake in 2003 suggested the possibility of catastrophic disaster against the environment in case of large volume of its contents and due to the applied seismic design codes and standards not covering the floating roof of the tank, development of a procedure for the seismic risk management for the tanks is highly necessitated. The authors have already revealed that responses of the tanks at seismic events are affected by their volume of content, and have developed a framework concerning the risk control method for bulging responses of tanks using liquid height control. This paper is the next step of the former study, and aiming to propose the similar framework concerning the risk control method for sloshing responses of tanks using the liquid height control. Damage modes of single deck type floating roofs in the cylindrical storage tanks are extracted, and with corresponding damage levels and cost for repair, the conditional expected losses in case of assumed earthquakes are calculated by using event trees. Finally, an index of cost effectiveness, which is defined as the sum of seismic strengthening cost and operation cost considering liquid height control and conditional expected loss, is introduced, and it is verified by a case study that the most appropriate seismic countermeasure is able to be selected by this frame work.
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  • -Effect of the Second Order Sloshing Mode-
    Haruki NISHI, Minoru YAMADA, Shinsaku ZAMA, Ken HATAYAMA, Kazuyoshi Se ...
    2007 Volume 45 Issue 6 Pages 357-363
    Published: 2007
    Released on J-STAGE: December 28, 2007
    JOURNAL FREE ACCESS
    The 2003 Tokachi-oki earthquake (M8. 0) caused the sinking of floating roofs of seven oil storage tanks in Tomakomai City. After the earthquake, the technical standard of the Fire Service Act regarding the sloshing of floating roof tanks was revised in 2005 and some floating roofs are to be reinforced until 2017 if necessary in order to prevent a similar damage on large oil storage tanks in future earthquakes.
    However, it is difficult to say that the behavior of a floating roof due to the second order-sloshing mode was verified thoroughly in a real-scale storage tank. The behavior is described as “ovalization” and “deflection of a deck”, which are theoretical background for the strength evaluation of the technical standard in the Fire Service Act. Especially, there were very few researches about the formulations of the effect of the second order sloshing mode upon the behavior of floating roofs. Therefore, it is needed to confirm the adequacy of the formulations of the sloshing, experimentally.
    In this study, we conducted shaking experiments by using a large shaking table and a model floating roof tank of 7. 6m-diameter, which is comparatively large tank.
    Considering the results obtained from the experiments, ovalizations were observed on the second order sloshing mode and the relationship between the deflection of the deck and the radial displacement of the floating roof was clearly confirmed. Then, we concluded that the formulations and the assumptions of the deflection and the ovalization defined in the Fire Service Act are adequate in comparison with the results from the experiments.
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  • Hiroshi MIMURA
    2007 Volume 45 Issue 6 Pages 364-371
    Published: 2007
    Released on J-STAGE: December 28, 2007
    JOURNAL FREE ACCESS
    An improved model based on the Beremin model is proposed to explain the experimental result that micro-cracks of size of ferrite grain are found in tensile test, but not found in fracture toughness test in the transition temperature region. Variation of the Weibull parameter due to change of temperature and stress triaxiality is also predicted in terms of the present model in consistence with experimental results.
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