Application of Plastic Region Bolt Tightening to Flange Joint Assembly

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Other Title
  • フランジ継手への塑性域締結の適用
  • フランジ継手への塑性域締結の適用--フランジの小型化と内圧作用時のボルト軸力の挙動
  • フランジ ツギテ エ ノ ソセイイキ テイケツ ノ テキヨウ フランジ ノ コガタカ ト ナイアツ サヨウジ ノ ボルトジクリョク ノ キョドウ
  • -フランジの小型化と内圧作用時のボルト軸力の挙動-
  • -Downsizing of Flange Joint and its Behavior under Internal Pressure-

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Abstract

The present paper describes the behavior of plastic region tightening of a bolt in a downsized flange joint subjected to internal pressure. An API 4-inch flange joint is downsized for plastic region tightening. The nominal diameter of the bolt is reduced from M16 to M8, and the bolt pitch circle diameter and the outer diameter of the flange are decreased by 11%. The flange rigidity and the stresses of the compact flange joint are calculated and are superior to the original API flange joint. Internal pressure is applied to a compact flange joint, and the behavior of additional bolt force is demonstrated. Load factor depends on the type of gasket, such that the load factor is positive for a flexible graphite sheet gasket. The load factor is in agreement with the value calculated by the Load Factor Method (LFM) . When the external force is applied to the bolted joint under plastic region tightening, the allowable limit of the additional bolt force is approximately 10% of the bolt yield force. In the compact flange, the additional bolt force is as small as 1% of the bolt yield force. Therefore, the additional bolt force has sufficient margin for the allowable limit.

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