255.705 Transmission lines: patrolling.

(a)Each operator shall have a patrol program to observe surface conditions on and adjacent to transmission line rights-of-way, and distribution line rights-of-way where the distribution line operates at 125 psig (862 kPa) or more in a Class 3 or 4 location, for indications of leaks, construction activity, and other factors affecting safety and operation.#

(b)The frequency of patrols is determined by the size of the line, the operating pressures, the class location, terrains, weather, and other relevant factors, but intervals between patrols may not be longer than prescribed in the following tables:#

Maximum interval between patrols Class location line | At highway and railroad crossings | At all other locations 1,2 | 7½ months; but at least twice each calendar year. | 15 months; but at least once each calendar year. 3 | 4½ months; but at least four times each calendar year. | 7½ months; but at least twice each calendar year. 4 | 4½ months; but at least four times each calendar year. | 4½ months; but at least four times each calendar year.#