Journal of High Pressure Institute of Japan

IN-VIVO AND IN-SITU FLOW MEASUREMENT OF PRESSURIZED GAS IN NON-TRANSPARENT MATERIAL BY MAGNETIC RESONANCE IMAGING

Shohji TSUSHlMA, Shuichiro HIRAI, Hiroshi TAKAO, Yoshimasa YAMAMOTO, Y ...

2002 Volume 40 Issue 1 Pages 4-10
Published: 2002
Released on J-STAGE: January 15, 2003

DOIhttps://doi.org/10.11181/hpi.40.4

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In-vivo and in-situ flow measurement technique for investigating flow behaviors of pressurized gas was presented. Magnetic resonance imaging (MRI) with highly pressurized gas was applied to examine characteristics of gaseous flow inside a Diesel Particulate Filter (DPF), which was installed in a non-magnetic high-pressure test vessel.
It is shown that signal intensity detected by MRI was enhanced using pressurized gas and that MRI techniques gives its feasibility to measure velocity distribution of pressurized methane gas. Results of velocity distirbution in the DPF cell revealed that fluid motion of gas inside the DPF cell was relatively uniform and that amount of fluid penetrating through the ceramic wall was not varied depending on the distance from the inlet.

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Study on Brittle Fracture Toughness Decrease due to High Strain Concentration of 9% Nickel Steel inner Shell Plate at LNG Aboveground Storage Tank

Yoshimichi KAWAKAMI, Eiichi YANAGISAWA, Akio DEGUCHI, Junichiro IMAI

2002 Volume 40 Issue 1 Pages 11-17
Published: 2002
Released on J-STAGE: January 15, 2003

DOIhttps://doi.org/10.11181/hpi.40.11

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Recently, many papers have reported on a decrease in brittle fracture toughness that steel structures suffer after a strong earthquake. Thus, it is necessary to evaluate the structural integrity of 9% nickel steel tanks under high strain concentration. In this study, the 3-point bend CTOD testing of 9% nickel base metal and welded joints was carried out at LNG temperature. The effect of pre-strain and high-speed strain on the critical CTOD was experimentally investigated. Based on fracture mechanics, it was confirmed that cracks in welded joints would not be propagate from defects detectable by non-destructive inspection, in the event of high-speed strain after plastic pre-strain during a strong earthquakes.

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Development of titanium-based brazing filler metals with low-melting-point

Tadao Onzawa, Takashi Iiyama

2002 Volume 40 Issue 1 Pages 18-27
Published: 2002
Released on J-STAGE: January 15, 2003

DOIhttps://doi.org/10.11181/hpi.40.18

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Titanium and titanium alloy are excellent in specific intensity and corrosion resistance, and it is also good on the biocompatibility. And, the brazing is a bonding method of which productivity and reliability are high, when the complicated and precise structure is produced. Especially, the titanium base brazing filler metal is excellent in joint strength and corrosion resistance. In the other hand, when the brazing is carried out using the low-melting-point brazing filler metal, the bonding is completed without hurting characteristics of the base metal in the brazing, and the joint may become the uniform composition.
In the laboratory of authors, by adding elements such as Co, Ag, Ni, Cr to the base alloy of Ti-Zr-Cu, the low-melting-point brazing filler metal has been developed. As the method, the low-melting-point braring filler metal constituent was found by using low-melting-point eutectic search procedure in order to reduce the experiment point. As a representative brazing filler metal, in the ternary compound system, 37. 5Ti-37. 5Zr-25Cu alloy (melting point 825°C) and in the quaternary compound system, 30Ti-43Zr-25Cu-2Cr alloy (melting point 825°C) was developed. However, It was clarified that 820°C was limitative for the melting point, and that in present state, the melting point depression under this temperature is difficult.
Conclusively, it was proven that there was the possibility as a practical brazing filler metal on author's developing brazing filler metal, as a result of considering brazing joint structure, wettability and strength characteristic after the brazing.

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Infra-red Thermographic Inspection for Back-side Corrosion Type Flaws in Bottom Floor of Oil Storage Tanks.

Shigeo KITSUKAWA, Jun IWAMURA, Ohki HASHIMOTO, Kazuyoshi SEKINE

2002 Volume 40 Issue 1 Pages 28-36
Published: 2002
Released on J-STAGE: January 15, 2003

DOIhttps://doi.org/10.11181/hpi.40.28

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This paper is concerned with an application of the infrared thermographic technique for detection of back-side corrosion type flaws in bottom floor of oil storage tanks. For detection of back-side flaws, we employ the active method, in which the surface-coated steel plates with various sizes of corrosion type flaws will be heated over coatings with an external thermal stimulation and afterwards the infrared scanning camera will be activated and then their thermal responses will be recorded. The two-dimensional thermal images due to the back-side flaws were measured for different thicknesses of coating. The digital data on temperature distributions after the image processings were analysis for sizing the back-side flaws, and comparisons between temperature distribution changes and flaw sizes were made. As the result, it is found that the thermal image shape and temperature distribution changes are correlated the shape and depth of back-side flaws respectively. The quantitative method for determining flaw diameter and depth are also presented. The results obtained in this paper fulfills the expectations for capabilities of the thermographic to be used in actual oil storage tank floor inspection.

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