Pipeline standards
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May I ask where I can find the pipeline standards? What is the relationship between DN and ￠?
I’m not sure what profession you are in, but if you work at a design firm or an engineering company, the technical department will provide you with the standard documents needed for your work. For the remaining standards, you can ask your former colleagues to lend them to you, or search online; there are also material standards available in many manuals and appendices. DN is the nominal diameter, ￠ is the outer diameter. The common outer diameter and wall thickness series can be approximated as DN = outer diameter – 2 * wall thickness.
Your question is way too vague – which specific aspect of pipeline standards are you referring to? I hope that after you reply, I can help you look into it, OK