Transmission lines: Permanent field repair of imperfections and damages.

(a)Each imperfection or damage that impairs the serviceability of pipe in a steel transmission line operating at or above 40 percent of SMYS must be—#

(1)Removed by cutting out and replacing a cylindrical piece of pipe; or#

(2)Repaired by a method that reliable engineering tests and analyses show can permanently restore the serviceability of the pipe.#

(b)Operating pressure must be at a safe level during repair operations.#