When is the term \"cin\" used? When should φ be used to represent it?
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When measuring pipe fittings of the pipeline type, when should inches be used?
Imperial pipes use inches, metric pipes use mm
First, you need to understand what inch, DN, φ, and De mean; all of these are acceptable ways of expressing it
For imperial pipes, inches are used; for metric pipes, mm is used. These are actually common ways of representation. If you have a diagram, you can label the units yourself and use lines to indicate them clearly
It indicates the outer diameter, which is generally expressed as outer diameter * wall thickness, for example, De273*7
The general requirement is that inches are used for imperial pipes, while millimeters are used as the unit for metric pipes.
Quite a few; it’s a matter of the application – for example, buried PE pipes used for gas are labeled in this way