Why are the pipe ends N1 and N2 labeled as N?
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Why are the pipe ends N1 and N2 labeled as N? Where does this standard come from?
According to chemical engineering design, it is not necessarily required to use N; generally, a smaller letter can also be used
You can also use a, b, c...... or A, B, C......
Any letter can be used, as long as it is easy to distinguish. N is used because of Nozzle; there are usually regulations in the design and management systems, but they are not mandatory