API650規格における材料設計応力
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API650の材料設計応力がなぜ一定値なのか、GB50341のように温度によって異なる値にならないのはなぜでしょうか？
API650の設計温度は90℃を超えない
50341、20度と100度では許容応力が異なり、その間の温度は補間法で求められますが、650において90度以下はすべて同じ値だということですか？
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