Regulations (Standards - 29 CFR) - Table of Contents|
| Part Number:||1917|
| Part Title:||Marine Terminals|
| Subpart Title:||Terminal Facilities|
| Standard Number:||1917.121|
| Title:||Spiral stairways.|
| GPO Source:||e-CFR|
Definition. "Spiral stairway" means one with closed circular form, uniform sector-shaped treads and a supporting column.
Requirements. Spiral stairways shall meet the following requirements:
Stairways shall conform to the minimum dimensions of Figure F-1;
|Spiral Stairway -- Minimum Dimensions|
|A (half-tread width)||B|
|Normal use by employees||11 inches (27.94 cm)||6 inches (15.24 cm)|
|Limited access||9 inches (22.86 cm)||5 inches (12.7 cm)|
Stairway risers shall be uniform and shall range from 6½ to 10½ inches (16.5 to 26.67 cm) in height;
Minimum loading capability shall be 100 pounds per square foot (4.79 kN), and minimum tread center concentrated loading shall be 300 pounds (1334 N);
Railings shall conform to the requirements of § 1917.112(c)(1). If balusters are used, there shall be a minimum of one per tread. Handrails shall be a minimum of 1¼ inches (3.18 cm) in outside diameter; and..1917.121(b)(5)
Vertical clearance shall be at least 6 feet, 6 inches (1.98 m) above the top step.
Maintenance. Spiral stairways shall be maintained in safe condition.
[62 FR 40141, July 25, 1997; 65 FR 40942, June 30, 2000]
Next Standard (1917.122)|
|Regulations (Standards - 29 CFR) - Table of Contents|
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