HG/T 20592 フランジ SO 600-25 RF 9.53において、25と9.53は何を意味していますか？
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皆様、こんにちは。組み合わせフランジにおいて、HG/T 20592規格のフランジSO 600-25 RF 9.53という記述がありますが、ここでの25と9.53は何を意味しているのでしょうか？
25は圧力等級PN25、9.53は接続管の壁厚です
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