GB/T 13401 大小頭寸法
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GB/T 13401におけるエルボーの最大サイズはDN1500までですが、DN1500を超えるエルボーにはどの規格が適用されますか？どなたかアドバイスをお願いします。ありがとうございます！
石油化学の基準で、あるいは非標準で
基準を大幅に超えているので、非標準品しか作れないな！
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