- Part Number:1915
- Part Number Title:OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT
- Subpart:1915 Subpart E
- Subpart Title:Scaffolds, Ladders and Other Working Surfaces
- Standard Number:
- GPO Source:
The provisions of this section shall apply to ship repairing, shipbuilding and shipbreaking.
Construction of portable wood cleated ladders up to 30 feet in length.
All knots shall be sound and hard. The use of material containing loose knots is prohibited. Knots shall not appear on the narrow face of the rail and, when in the side face, shall be not more than ½ inch in diameter or within ½ inch of the edge of the rail or nearer than 3 inches to a tread or rung.
Pitch pockets not exceeding ⅛ inch in width, 2 inches in length and ½ inch in depth are permissible in wood side rails, provided that not more than one such pocket appears in each 4 feet of length.
The width between side rails at the base shall be not less than 11½ inches for ladders 10 feet or less in length. For longer ladders this width shall be increased at least ¼ inch for each additional 2 feet in length.
Side rails shall be at least 1⅝ × 3⅝ inches in cross section.
Cleats (meaning rungs rectangular in cross section with the wide dimension parallel to the rails) shall be of the material used for side rails, straight-grained and free from knots. Cleats shall be mortised into the edges of the side rails ½ inch, or filler blocks shall be used on the rails between the cleats. The cleats shall be secured to each rail with three 10d common wire nails or fastened with through bolts or other fasteners of equivalent strength. Cleats shall be uniformly spaced not more than 12 inches apart.
leats 20 inches or less in length shall be at least 25/32 × 3 inches in cross section. Cleats over 20 inches but not more than 30 inches in length shall be at least 25/32 × 3¾ inches in cross section.
Construction of portable wood cleated ladders from 30 to 60 feet in length.
Rails shall be of not less than 2 × 6 inch lumber.
Cleats shall be of not less than 1 × 4 inch lumber.
Cleats shall be nailed to each rail with five 10d common wire nails or fastened with through bolts or other fasteners of equivalent strength.
[47 FR 16986, Apr. 20, 1982; 67 FR 44542, July 3, 2002]