- #1
TSN79
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I'm wondering about the the term 'Diametre Nominal', or 'NPS' as it's called in the US. I've realized that pipes that are identified by "nominal" names are only loosely related to the actual dimensions. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches. I find this "inaccuracy" very strange. And another thing, most DN measures are relatively even numbers like 15, 20, 25, 40, 50 and so on. But then there is also a 32 in there which totally breaks the "even-ness"! That puzzle's me the most! If someone has a good explanation to my wonderings I would be grateful :)