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 |
1⅞ × 2¾ |
1⅞ × 3¾ |
| 16 |
1⅞ × 2¾ |
1⅞ × 3¾ |
| 18 |
1⅞ × 3 |
1⅞ × 4 |
| 20 |
1⅞ × 3 |
1⅞ × 4 |
| 24 |
1⅞ × 3 |
1⅞ × 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
or
1 × 8 |
2 × 4 |
2 × 6 |
| 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 |
1⅝ × 9½ |
2 × 12 |
1⅝ × 11½ |
3 × 8 |
2⅝ × 7½ |
3 × 10 |
2⅝ × 9½ |
3 × 12 |
2⅝ × 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 |
| ⅝ |
3 |
4 |
3¾ |
| ¾ |
4 |
5 |
4½ |
| ⅞ |
4 |
5 |
5¼ |
TABLE G–1—NUMBER AND SPACING OF U-BOLT WIRE ROPE CLIPS—Continued
| Improved plow steel, rope diameter, inches |
Number of clips |
Minimum spacing, inches |
| Drop forged |
Other material |
| 1 |
4 |
6 |
6 |
| 1⅛ |
5 |
6 |
6¾ |
| 1¼ |
5 |
7 |
7½ |
| 1⅜ |
6 |
7 |
8¼ |
TABLE G–1—NUMBER AND SPACING OF U-BOLT WIRE ROPE CLIPS—Continued
| Improved plow steel, rope diameter, inches |
Number of clips |
Minimum spacing, inches |
| Drop forged |
Other material |
| 1½ |
6 |
8 |
9 |
1 Three 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 |
| ⅜ |
5/64 |
| ½ |
7/64 |
| ⅝ |
9/64 |
| ¾ |
5/32 |
| ⅞ |
11/64 |
| 1 |
3/16 |
| 1⅛ |
7/32 |
| 1¼ |
¼ |
| 1⅜ |
9/32 |
| 1½ |
5/16 |
| 1¾ |
11/32 |
[47 FR 16986, Apr. 20, 1982; 61 FR 26351, May 24, 1996; 67 FR 44543, July 3, 2002; 76 FR 33610, June 8, 2011]