Out of Roundness Definition ASTM A358
Out of Roundness Definition ASTM A358
(OP)
Hello,
I’ve seen out-of-roundness defined various ways depending on the standard. Can anyone please help me interpret the out-of-roundness per ASTM A358 (Electric Fusion Welded Stainless Steel Pipe) stating:
“Out-of-Roundness – difference between major and minor outside diameters, 1%.”
Is this similar to ASME Sec VIII Div UG-80; where Out-of-Roundness is defined as: (Major Outside Diameter – Minor Outside Diameter) / Nominal Outside Diameter?
I’ve seen out-of-roundness defined various ways depending on the standard. Can anyone please help me interpret the out-of-roundness per ASTM A358 (Electric Fusion Welded Stainless Steel Pipe) stating:
“Out-of-Roundness – difference between major and minor outside diameters, 1%.”
Is this similar to ASME Sec VIII Div UG-80; where Out-of-Roundness is defined as: (Major Outside Diameter – Minor Outside Diameter) / Nominal Outside Diameter?





RE: Out of Roundness Definition ASTM A358
In A358 you are dividing by the average, and in UG-80 you are dividing by the specified outside diameter.
I would hope that they would be the same in the end.
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P.E. Metallurgy, Plymouth Tube
RE: Out of Roundness Definition ASTM A358