["GC C tuyau de transport", "Nous avons un tuyau de vapeur DN5 PN
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我司有一条蒸汽管道DN50,PN10的，是否属于GC1 呢？
现在部分管道变形，想要整改，自己可以做吗？
需要有制造安装资质，安装前办理安装告知，办理使用登记证。
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