- Part Number:1917
- Part Number Title:Marine Terminals
- Subpart:1917 Subpart F
- Subpart Title:Terminal Facilities
- Standard Number:
- Title:Spiral stairways.
- GPO Source:
Definition. "Spiral stairway" means one with closed circular form, uniform sector-shaped treads and a supporting column.
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)|
[62 FR 40141, July 25, 1997; 65 FR 40942, June 30, 2000]