def t4_p(pressure):
    """ Release on the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam, September 1997
    Section 8.2 The Saturation-Temperature Equation
    Eq 31, Page 34 """
    beta = pressure ** 0.25
    e = beta ** 2 - 17.073846940092 * beta + 14.91510861353
    f = 1167.0521452767 * beta ** 2 + 12020.82470247 * beta - 4823.2657361591
    g = -724213.16703206 * beta ** 2 - 3232555.0322333 * beta + 405113.40542057
    d = 2 * g / (-f - (f ** 2 - 4 * e * g) ** 0.5)
    return (650.17534844798 + d - ((650.17534844798 + d) ** 2 - 4 * (-
        0.23855557567849 + 650.17534844798 * d)) ** 0.5) / 2
