All issues
Predecessor
Volume 42, Issue 1
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
Original Paper
-
Shinsaku ZAMA, Yoshiaki HISADA, Seiji TSUNO, Kazuyoshi KUDOArticle type: Original paper
2004 Volume 42 Issue 1 Pages 4-13
Published: 2004
Released on J-STAGE: February 18, 2004
JOURNAL FREE ACCESSIt is said that M8 class earthquake like the 1944 Tonankai earthquake may occur in the seismogenic zone off the Kii peninsula with considerably high probability in the near future. Such a large earthquake with shallow focal depth is prone to generate long-period ground motions which strongly excite liquid sloshing of oil storage tanks, as in the 1964 Niigata earthquake and the 1999 Chi-Chi Taiwan earthquake.
Here, we tried to predict the long-period ground motions from the hypothetical Tonankai earthquake at Nagoya, where tanks will be strongly affected, based on the empirical and theoretical methods. As a result, we found that the predicted acceleration spectra by both methods agree with each other, and that the predicted spectra show the high risk of overflow of oil from tanks with about 3 sec of natural period of sloshing.View full abstractDownload PDF (444K) -
Masao HAYAKAWA, Koji YAMAGUCHI, Megumi KIMURA, Kazuo KOBAYASHIArticle type: Original paper
2004 Volume 42 Issue 1 Pages 14-18
Published: 2004
Released on J-STAGE: February 18, 2004
JOURNAL FREE ACCESSNew observation method was developed for visualizing subgrain structure on a chemical-mechanically polished surface for a ferritic heat-resisting steel that contained 12mass% chromium and 2mass% tungsten, using field emission type-scanning electron microscope (FE-SEM) . The backscattering electron images showed that subgrain structures could be visualized clearly without being influenced by the presence of precipitated particles.View full abstractDownload PDF (167K) -
-Development of Corrosion Preventive Bottom Plate for Oil Storage Tank-4-Kenji KATOH, Keita SUZUMURA, Chyuuichi KATOH, Hiroyasu ISHIMOTO, Takas ...Article type: Original paper
2004 Volume 42 Issue 1 Pages 19-27
Published: 2004
Released on J-STAGE: February 18, 2004
JOURNAL FREE ACCESSApplicability of Zn sprayed steel plate for corrosion preventive bottom plate of oil storage tanks is investigated in this study.
From the results by laboratory experiments, it is found that apparent localized corrosion does not grow even in the condition where oxygen concentration differential cell is formed. The corrosion rate of Zn sprayed layer increases with elevation of temperature and of chloride ion concentration, but considering oil storage field condition, the corrosion rate is adequately low. Hence, applicability of Zn sprayed steel plate for corrosion preventive bottom plate of oil storage tanks is found.
Moreover, corrosion lifetime enhancement effect by Zn sprayed steel plate is estimated by summarizing results reported up to now utilizing extreme value statistic analysis. As a result, it is estimated that Zn sprayed layer with 400μm thickness enables to extend corrosion lifetime of oil storage tank bottom plate about twice in oil storage tank field.View full abstractDownload PDF (275K) -
Tomohiro TAKAKI, Toshimichi FUKUOKAArticle type: Original paper
2004 Volume 42 Issue 1 Pages 28-35
Published: 2004
Released on J-STAGE: February 18, 2004
JOURNAL FREE ACCESSIt is well known that the scatter of bolt loads occurs when bolting up a pipe flange connection with a number of bolts. In general practice, two factors presumably have dominant effects on the non-uniform loads. One is due to the scatter of bolt clamping force when adopting a torque control method. The second is elastic interaction due to the flange deformation occurring in the process of successive bolt tightening. In this study, bolt-up finite element simulations of the pipe flange connection are conducted by considering the scatter of bolt clamping force when using the torque control method.
Effects of interrelationship between the torque control method and the elastic interaction on the bolt load scatter occurring in the bolt-up process are evaluated.View full abstractDownload PDF (324K) -
Takeru SANO, Tatsumi TAKEHANA, Kazuyoshi SEKINEArticle type: Original paper
2004 Volume 42 Issue 1 Pages 36-47
Published: 2004
Released on J-STAGE: February 18, 2004
JOURNAL FREE ACCESSThe present paper describes a new gas detecting system which can visualize leak spots of LP-gas (main ingredient:propane-gas) on real time, using OPO-laser, IR-camera, optical system and reflecting screen. The irradiated OPO-laser beam with a certain wavelength (3. 37μm) is fully absorbed through LP-gas, and this phenomenon has been used as the basic principle for LP-gas detection. So, the IR-camera consisting of InSb elements which have excellent detectivity for wavelength band of 3μm-5μm has been employed for the experiment. The results of basic experiments on some factors affecting detectability of this system, such as effect of laser wavelength and exposure time of IR-camera, have been presented. Furthermore, intensity differences of infrared between the inspected spot through the LP-gas and background area on the screen have been also examined to determine the best condition of measurement for visualizing by this system. It is concluded that the proposed system offers a good tool for monitoring the LP-gas leakage.View full abstractDownload PDF (668K)
- |<
- <
- 1
- >
- >|