低温貯槽ナックルプレートの許容圧縮応力の安全裕度について

DOI Web Site 参考文献18件

書誌事項

タイトル別名
  • Design Margin of Allowable Compressive Stresses for Knuckle Plate of Refrigerated Storage Tank
  • テイオンチョソウ ナックル プレート ノ キョヨウ アッシュク オウリョク ノ アンゼンユウド ニ ツイテ

この論文をさがす

抄録

Under conditions of internal pressure, circumferential compressive stresses are developed in the knuckle plate of refrigerated storage tank. In “Recommended Practice for LNG Aboveground Storage” and “Recommended Practice for LNG Inground Storage”, the analogy between compressive stresses in knuckle plate and those in axially loaded cylinders is employed and the allowable compressive stresses for knuckle plate are given linking to the allowable tensile stresses. In the ASME Boiler and Pressure Vessel Code Sec. VIII Div. 1, the factor of safety on tensile strength has been reduced from 4. 0 to 3. 5 in establishing the allowable tensile stresses. According to the reduction in the ASME Code, the factor of safety in these Practices were reexamined. In the reexamination, the design margin of the allowable compressive stresses for knuckle plate was investigated. <br>The knuckle plate is equivalent to the torus region of torispherical shell and the investigation of the design margin was performed using the failure pressure of the shell. The failure modes of the shell are buckling and plastic collapse and the design equations for these modes were used to calculate the pressure. The materials of the shell studied were A5083-O, 9% Ni steel and SUS304 for which the allowable tensile stresses have been increased because of the reduction in the factor of safety. The failure stress was calculated using the failure pressure and the design margin was defined as the ratio of the failure stress to the allowable compressive stress. The tentative lower limit for the design margin was set to be 2. 0 and at least 1. 5. For A5083-O and 9% Ni steel, the minimum design margins were above 2. 0, and the value for SUS304 was 1. 79. This demonstrates the validity of the reduction in the factor of safety in establishing the allowable tensile stresses.

収録刊行物

  • 圧力技術

    圧力技術 47 (5), 305-313, 2009

    一般社団法人 日本高圧力技術協会

参考文献 (18)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ