Specified Minimum Yield Strength
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Specified Minimum Yield Strength (SMYS) means the specified minimum yield strength for steel pipe manufactured in accordance with a listed specification1. This is a common term used in the oil and gas industry for steel pipe used under the jurisdiction of the United States Department of Transportation. It is an indication of the minimum stress a pipe may experience that will cause plastic (permanent) deformation.
The equation for finding SMYS is P * OD / (2 * T), where P is pressure, OD is the pipe’s outside diameter, and T is its wall thickness.
ASME B31G-2012 "Manual for Determining the Remaining Strength of Corroded Pipelines"pag.2" pg. 2
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