49 CFR 192.107
Yield strength (S) for steel pipe.
(a)For pipe that is manufactured in accordance with a specification listed in section I of appendix B of this part, the yield strength to be used in the design formula in § 192.105 is the SMYS stated in the listed specification, if that value is known.#
(b)For pipe that is manufactured in accordance with a specification not listed in section I of appendix B to this part or whose specification or tensile properties are unknown, the yield strength to be used in the design formula in § 192.105 is one of the following:#
(1)If the pipe is tensile tested in accordance with section II-D of appendix B to this part, the lower of the following:#
(i)80 percent of the average yield strength determined by the tensile tests.#
(ii)The lowest yield strength determined by the tensile tests.#
(2)If the pipe is not tensile tested as provided in paragraph (b)(1) of this section, 24,000 p.s.i. (165 MPa).#