700NB denotes the pipe size; is there any difference from DN700?
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700NB denotes the pipe size; is there any difference from DN700? What is the specific standard for NB? Are there exact standard values for the outer diameter?
DN700=700NB=28″ refers to the nominal pipe diameter. NB stands for nominal, meaning the standard value; B denotes bore, which is the inner diameter. DN nominal means nominal, and D stands for diameter. DN is neither the outer diameter nor the inner diameter. But it is closer to the inner diameter. For those with a low pressure rating, the wall thickness is small, and the DN is less than the inner diameter ； Those with high pressure ratings have thick walls, and the DN is greater than the inner diameter