Current through Register Vol. 54, No. 50, December 14, 2024
Section 3a.35 - Ladders and runways(a) Walkways, runways and platforms are required between and on top of boilers, which are more than 8-feet high from the operating floor to afford accessibility for the operation and servicing.(b) Walkways, runways and platforms must meet the following requirements: (1) Be constructed of metal.(2) Be constructed of safety treads, standard grating, or similar material with a minimum clear width of 30 inches.(3) Be constructed by bolts, welds or rivets.(4) Be equipped with handrails that are 42-inches high with an intermediate rail and 6-inch toeboard.(c) A stairway that is a means of access to the walkways, runways or platforms must not exceed an angle of 45°.(d) A ladder that serves as a means of access to walkways, runways or platforms must be constructed:(2) So the rungs extend through the side members and are permanently secured to the side rails.(3) So the front of the rungs have a distance of at least 30 inches from the nearest permanent object on the climbing side of the ladder.(4) So the back of the rungs have a distance of at least 6 1/2 inches from the nearest permanent object.(5) So there is a clear width of at least 15 inches from the centerline of the ladder on either side across the front of the ladder.(e) A welder qualified under Standard Qualification Procedures of the American Welding Society is required for welding a walkway, runway, platform or ladder.(f) A walkway, runway or platform exceeding 6 feet in length must have at least two means of exit access.