The provisions of this section apply to ship repairing, shipbuilding and shipbreaking.
Table E-1 — Dimensions and Spacing of Wood Independent-Pole Scaffold Members
| Structural members | Light duty (Up to 25 pounds per square foot) — Height in feet | Heavy duty (25 to 75 pounds per square foot) — Height in feet |
|---|
| ≤24 | >24≤40 | >40≤60 | ≤24 | >24≤40 | >40≤60 |
|---|
| Poles or uprights (in inches) | 2 × 4 | 3 × 4 or 2 × 6 | 4 × 4 | 3 × 4 | 4 × 4 | 4 × 6 |
| Bearers (in inches) | 2 × 6 | 2 × 6 | 2 × 6 | 2 × 8 | 2 × 8 | 2 × 10 |
| Ledgers (in inches) | 2 × 6 | 2 × 6 | 2 × 6 | 2 × 8 | 2 × 8 | 2 × 8 |
| Stringers (not supporting bearers) (in inches) | 1 × 6 | 1 × 6 | 1 × 6 | 1 × 6 | 1 × 6 | 1 × 6 |
| Braces (in inches) | 1 × 4 | 1 × 6 | 1 × 6 | 1 × 6 | 1 × 6 | 1 × 6 |
| Pole spacing — longitudinally (in feet) | 7½ | 7½ | 7½ | 7 | 7 | 7 |
| Pole spacing — transversely (in feet) | 6½ min | 7½ min | 8½ min | 6½ | 10 | 10 |
| Ledger spacing — vertically (in feet) | 7 | 7 | 7 | 4½ | 4½ | 4½ |
Table E-2 — Specifications for Side Rails of Ladders
| Length (in feet) | Cross section (in inches) |
|---|
| At ends | At center |
|---|
| 15 | 17⁄8 × 2¾ | 17⁄8 × 3¾ |
| 16 | 17⁄8 × 2¾ | 17⁄8 × 3¾ |
| 18 | 17⁄8 × 3 | 17⁄8 × 4 |
| 20 | 17⁄8 × 3 | 17⁄8 × 4 |
| 24 | 17⁄8 × 3 | 17⁄8 × 4½ |
Table E-3 — Specifications for the Construction of Horses
| Structural members | Height in feet |
|---|
| ≤10 | >10≤16 | 16≤20 |
|---|
| | inches | inches | inches |
| Legs | 2 × 4 | 3 × 4 | 4 × 6 |
| Bearers or headers | 2 × 6 | 2 × 8 | 4 × 6 |
| Crossbraces | 2 × 4 | 2 × 4 | 2 × 6 |
| | or | | |
| | 1 × 8 | | |
| Longitudinal braces | 2 × 4 | 2 × 6 | 2 × 6 |
Table E-4 — Safe Center Loads for Scaffold Plank of 1,100 Pounds Fibre Stress
| Span in feet | Lumber dimensions in inches |
|---|
| A | B | A | B | A | B | A | B | A | B |
|---|
| | 2 × 10 | 15⁄8 × 9½ | 2 × 12 | 15⁄8 × 11½ | 3 × 8 | 25⁄8 × 7½ | 3 × 10 | 25⁄8 × 9½ | 3 × 12 | 25⁄8 × 11½ |
| 6 | 256 | | 309 | | 526 | | 667 | | 807 | |
| 8 | 192 | | 232 | | 395 | | 500 | | 605 | |
| 10 | 153 | | 186 | | 316 | | 400 | | 484 | |
| 12 | 128 | | 155 | | 263 | | 333 | | 404 | |
| 14 | 110 | | 133 | | 225 | | 286 | | 346 | |
| 16 | | | 116 | | 197 | | 250 | | 303 | |
(A) — Rough lumber.
(B) — Dressed lumber.
Table G-1 — Number and Spacing of U-Bolt Wire Rope Clips
| Improved plow steel, rope diameter, inches | Number of clips | Minimum spacing, inches |
|---|
| Drop forged | Other material |
|---|
| (¹) | | | |
| ½ | 3 | 4 | 3 |
| 5/8 | 3 | 4 | 3¾ |
| ¾ | 4 | 5 | 4½ |
| 7/8 | 4 | 5 | 5¼ |
| 1 | 4 | 6 | 6 |
| 11/8 | 5 | 6 | 6¾ |
| 1¼ | 5 | 7 | 7½ |
| 13/8 | 6 | 7 | 8¼ |
| 1½ | 6 | 8 | 9 |
¹Three clips shall be used on wire size less than ½-inch diameter.
Table G-2 — Maximum Allowable Wear at Any Point of Link
| Chain size in inches | Maximum allowable wear in fraction of inches |
|---|
| ¼ (9⁄32) | 3/64 |
| 3/8 | 5/64 |
| ½ | 7/64 |
| 5/8 | 9/64 |
| ¾ | 5/32 |
| 7/8 | 11/64 |
| 1 | 3/16 |
| 11/8 | 7/32 |
| 1¼ | ¼ |
| 13/8 | 9/32 |
| 1½ | 5/16 |
| 1¾ | 11/32 |
[47 FR 16986, Apr. 20, 1982, as amended at 61 FR 26351, May 24, 1996; 67 FR 44543, July 3, 2002; 76 FR 33610, June 8, 2011]