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NominalDiameter on piping

Question asked by Alessandro Frattini on Apr 12, 2009
Latest reply on Apr 13, 2009 by Alessandro Frattini
Hi to all,
it's a curiosity, but what's the difference between nominal diameter and inner diameter ?
They are not the same thing ?
May have the same diameter ?
In Italy, the 63 mm diameter tube is called inner diameter and nominal diameter also.
Why in America are called different ?

Thank you,