CFR /  Title 46  /  Part 154  /  Sec. 154.401 Definitions.

As used in Sec. Sec. 154.440 and 154.447:

``[sigma]Y'' means the minimum yield strength of the tank material, including weld metal, at room temperature.

``[sigma]B'' means minimum tensile strength of the tank material, including weld metals, at room temperature.