① The minimum elongation in 2 in. [50 mm] shall be that determined by the
following equation:
e = 625000（1940）A<sup>0.2</sup> / U<sup>0.9</sup>
where:
e = minimum elongation in 2 in. or 50 mm in percent, rounded to the nearest percent,
A = the lesser of 0.75 in. 2 [500 mm 2 ] and the cross-sectional area of the tension test specimen, calculated using the specified outside diameter of the pipe, or the nominal width of the tension test specimen and the specified wall thickness of the pipe, with the calculated value rounded to the nearest 0.01 in.<sup>2</sup> [1 mm<sup>2</sup>], and
U = specified minimum tensile strength, psi [MPa].
② See Table X4.1 or Table X4.2, whichever is applicable, for the minimum elongation values that are required for various combinations of tension test specimen size and specified minimum tensile strength.
