All issues
Volume 41 (2003)
- Issue 6 Pages 292-
- Issue 5 Pages 216-
- Issue 4 Pages 150-
- Issue 3 Pages 96-
- Issue 2 Pages 48-
- Issue 1 Pages 4-
Predecessor
Volume 41, Issue 3
Displaying 1-4 of 4 articles from this issue
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Original Paper
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-Design of LNG Piping using Invar Alloy -Susumu HONGOH, Shuji YAMAMOTO, Setsuji KISHIMOTO, Shinji TSUDA, Nobuyo ...Article type: Original paper
2003 Volume 41 Issue 3 Pages 96-105
Published: 2003
Released on J-STAGE: July 24, 2003
JOURNAL FREE ACCESSAustenitic stainless steel LNG piping, widely used, requires thermal deformation and stress reducing devices, such as pipe looping which is one of the causes to increase total piping construction costs due to its high costs for material, welding and insulation. To tackle this problem, the authors focused on Invar alloy having a coefficient of thermal expansion which is 1⁄10 that of stainless steel, and developed Invar alloy LNG piping, which can omit pipe looping.
This report (The 1st report) describes the concept and merits of Invar alloy LNG piping, and the results of studies on its design. Through the studies, design standard properties were determined and design problems peculiar to Invar alloy LNG piping were solved. Furthermore, the concept and design method were verified through the test piping construction and the experiments using it.View full abstractDownload PDF (245K) -
Tomohiro TAKAKI, Toshimichi FUKUOKAArticle type: Original paper
2003 Volume 41 Issue 3 Pages 106-114
Published: 2003
Released on J-STAGE: July 24, 2003
JOURNAL FREE ACCESSIn these environmentally sensitive times, bolted flanged joint design that makes the leakage from a joint a design criterion has been investigating. However, achieving uniform bolt preload is difficult when tightening pipe flanges with a number of bolts, even if the appropriate amounts of bolt preload can be calculated following established design rules. A guideline for bolted flange joint assembly has been presented by ASME. However, the guideline needs repeated bolt-up operations to get uniform preloads. In this study, in order to establish a more effective bolt assembly guideline, numerical calculations are systematically executed by using three-dimensional finite element analysis. The analytical objects are pipe flanges of class 150lb and 300lb raised face slip-on welding type specified in JPI with a compressed asbestos sheet gasket inserted. The variations of bolt preload and contact pressure distributions at the gasket bearing surface during bolting up are estimated.View full abstractDownload PDF (372K) -
Hiroshi YONEYAMA, Hassui MIHARADAArticle type: Original paper
2003 Volume 41 Issue 3 Pages 115-122
Published: 2003
Released on J-STAGE: July 24, 2003
JOURNAL FREE ACCESSIn ultrasonic testing, artificial defects made by electrical discharge machining (EDM) are often used as the reference defects. It is very important to confirm the difference of echo heights between for fatigue crack and EDM notch. So, an experimental confirmation of the echo height differences has been carried out for the fatigue cracks and the EDM notches of the same size. The results showed that the echo heights for the EDM notches were 10 to 14 dB higher than those for the fatigue cracks and the difference of flaw tip echo height was about 22 dB. It was also found that the fatigue crack having an opening 2μm or more could be detected at DAC100% level, and that it was deemed that the effect of fatigue crack surface roughness on the echo height could be negligible.View full abstractDownload PDF (182K)
Review
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Toshiyuki SAWAArticle type: Technical report
2003 Volume 41 Issue 3 Pages 123-130
Published: 2003
Released on J-STAGE: July 24, 2003
JOURNAL FREE ACCESSFive accidents on mechanical structures which the author investigated and their sources were described. (1) Two workers were killed by soil collapse due to a rupture of bolted joints in sheet pile structures. (2) Drive recklessly of tractor due to brake trouble. (3) Leakage accident of LPG internal fluid from bolted pipe flange connection due to earthquake. (4) Gas explosion from buried pipe line. (5) An accident where two workers were killed by a rupture of chains in operation. As conclusions, the author pointed out that engineers hand to pay a lot of attentions to the design and the instruction for structures. Especially, it is pointed out that a technology for bolted joints is important in practice.View full abstractDownload PDF (315K)
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