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Yes, spiral, ship, and alternating tread-type stairs are allowed to be used when the employer can demonstrate that it is not feasible to provide standard stairs. Winding stairways may be used on tanks and similar round structures when the diameter of the tank or structure is at least 5 feet (1.5 m).
['Walking Working Surfaces']
['Stairway Railings and Guides', 'Walking Working Surfaces']