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Credibility ,DN refers to the nominal diameter of the pipe. Note: This is neither the outer diameter nor the inner diameter; it should be related to the imperial unit in the initial development of the pipeline engineering; it is usually used to describe the galvanized steel pipe. Its correspondence with the imperial units is as follows:
De mainly refers to the outer diameter of the pipe, generally marked with De, and needs to be marked as the outer diameter X wall thickness; mainly used for description: seamless steel pipe, PVC and other plastic pipes, and other pipes requiring a clear wall thickness. Take galvanized welded steel pipe as an example. The two methods of marking with DN and De are as follows:
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