巻号一覧
48 巻 (2010)
- 6 号 p. 303-
- 5 号 p. 252-
- 4 号 p. 184-
- 3 号 p. 114-
- 2 号 p. 61-
- 1 号 p. 4-
前身誌
48 巻, 4 号
選択された号の論文の5件中1～5を表示しています
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資料
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橋本 哲, 堀内 知明原稿種別: 資料
2010 年 48 巻 4 号 p. 213-220
発行日: 2010/07/25
公開日: 2010/08/27
ジャーナル フリーPDF形式でダウンロード (1342K)
論文
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鈴木 雄二, 小林 英男, 小柴 佑介原稿種別: 論文
2010 年 48 巻 4 号 p. 184-191
発行日: 2010/07/25
公開日: 2010/08/27
ジャーナル フリーThis paper describes the analysis of a fire accident caused by the leakage of a large amount of oxygen gas in a university. Observation of the fracture surface of a ruptured oxygen tube with a scanning electron microscope provided undisputable evidence that ductile fracture of the tube occurred. Fire-cause investigation revealed that the fire accident was probably owing to the lack of safety-management system in the university. In order to improve the safety management in the university, accident scenarios which are useful for analyzing accidents were made using accident causes, human actions, and their results.抄録全体を表示PDF形式でダウンロード (892K) -
第5報: ポンツ-ン形状と応力低減石田 和雄, 内海 雅彦, 日詰 雅之原稿種別: 論文
2010 年 48 巻 4 号 p. 192-199
発行日: 2010/07/25
公開日: 2010/08/27
ジャーナル フリーIn a previous paper, it was shown that circumferential in-plane stresses in the pontoon shell are caused by the circumferential bending deformation of the pontoon of a floating roof due to nonlinearity of sloshing. Furthermore, the validity of the present nonlinear sloshing analysis method was confirmed by comparing the theoretical results with results of a sinusoidal excitation test using a floating roof of a cylindrical storage tank with capacity of 15, 000kl.
In this paper, dependence of the nonlinear responses of the stresses on the slope of the pontoon is examined. Numerical results show that the decrease in the slope of the upper and lower plate of the pontoon results in decrease of the in-plane stresses of pontoon lower part. This stress reduction is due to the fact the circumferential out-of-plane bending moment is decreased by reducing the cone effect produced by the slopes of the upper and lower plates of the pontoon shell. A method for reducing stresses in the floating roof pontoon is proposed.抄録全体を表示PDF形式でダウンロード (1236K) -
糸井 克豊, 長瀬 雄一郎, 澤 俊行, 小林 隆志原稿種別: 論文
2010 年 48 巻 4 号 p. 200-204
発行日: 2010/07/25
公開日: 2010/08/27
ジャーナル フリーThe use of asbestos gaskets in pipe-flanges has already been prohibited in Japan. Nowadays, non-asbestos gaskets, of which materials are PTFE, expanded graphite, etc. , are used in industries. Gasket users expect the non-asbestos gaskets to have better performance than that of asbestos gasket. So far, non-asbestos gaskets have not gained high reliability as gasket users do not have long term data in terms of the life of gaskets.
In this paper, the thermal endurance life of non-asbestos gaskets and asbestos gaskets were tested. The gaskets were held at several constant temperatures, such as 200°C, 214°C, 260°C, 280°C and 300°C, and the weight loss, the change of axial bolt force and sealability are measured using a test rig. The thermal endurance life is estimated using the Arrhenius equation and discussions are made on the non-asbestos-gasket life.抄録全体を表示PDF形式でダウンロード (728K) -
小林 隆志, 中田 吉彦, 江西 俊彦, 菊池 務, 澤 俊行原稿種別: 論文
2010 年 48 巻 4 号 p. 205-212
発行日: 2010/07/25
公開日: 2010/08/27
ジャーナル フリーAsbestos fiber gaskets had widely been used in bolted flange connections of piping systems in chemical plants, oil refinery plants, power plants and so on. However, the use of asbestos fiber gaskets has already been prohibited due to the health problems caused by the asbestos fibers. As substitutes for the asbestos fiber gaskets, non-asbestos gaskets, such as aramid fiber-based, expanded graphite-based and PTFE-based, have been developed by gasket manufacturers and they are in use. Contrary to the superior heat-resisting properties of the asbestos fiber gaskets, the thermal resistances of some of the non-asbestos gaskets are not high enough. The thermal resistances of non-asbestos fiber gaskets do not satisfy the demands of gasket users. This is a serious problem especially in the high temperature applications for low nominal pressure rating flanged connections. One of the solutions is to apply spiral wound gaskets to flanged connections instead of sheet gaskets. It is not a common practice to use spiral wound gaskets for low nominal pressure rating flanged connections as spiral wound gaskets normally require high bolt loads. However, spiral wound gaskets might be used in low nominal pressure flanged connections as the sealing performance of newly developed spiral wound gaskets is quite high.
In this paper, the sealing performance of sheet gaskets and spiral wound gaskets are tested under the same loading condition. Both the sealing performances are compared and discussions are made. It is found that the sealing performances of spiral wound gaskets are superior to those of sheet gaskets under the same gasket load. Thus, the spiral wound gaskets can be applied to low nominal pressure rating flanged connections as substitutes for sheet gaskets.抄録全体を表示PDF形式でダウンロード (677K)
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