Note: | • You can use fixed ladders for climbing elevated structures, such as tanks, towers, and overhead traveling cranes, when their use is common practice in your industry. |
• You can use winding stairways on tanks and similar round structures if the structure's diameter is at least five feet. | |
• You could use a spiral stairway as an exit route in a restricted area that lacks room for a conventional stairway. |
Definitions: | • A stairway or fixed stairs is a series of steps and landings: |
– Leading from one level or floor to another. | |
– Leading to platforms, pits, boiler rooms, crossovers, or around machinery, tanks, and other equipment. | |
– Used more or less continuously or routinely by employees or only occasionally by specific individuals. | |
– With three or more risers. | |
• A riser is the vertical part of the step at the back of a tread that rises to the front of the tread above. | |
• A tread is the horizontal part of the step. Tread width is the distance from the front of the tread to the back. |
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