The provisions of this section apply to ship repairing, shipbuilding and shipbreaking.
Table E-1--Dimensions and Spacing of Wood Independent-Pole Scaffold Members--------------------------------------------------------------------------------------------------------------------------------------------------------
Light duty (Up to 25 pounds per square foot)-- Heavy duty (25 to 75 pounds per square foot)--
Height in feet Height in feet
Structural members -------------------------------------------------------------------------------------------------------
<=24 24<=40 40<=60 <=24 24<=40 40<=60--------------------------------------------------------------------------------------------------------------------------------------------------------Poles or uprights (in inches)................... 2x4 3x4 or 2x6 4x4 3x4 4x4 4x6Bearers (in inches)............................. 2x6 2x6 2x6 2x8 2x8 2x10Ledgers (in inches)............................. 2x6 2x6 2x6 2x8 2x8 2x8Stringers (not supporting bearers) (in inches).. 1x6 1x6 1x6 1x6 1x6 1x6Braces (in inches).............................. 1x4 1x6 1x6 1x6 1x6 1x6Pole spacing--longitudinally (in feet).......... 7\1/2\ 7\1/2\ 7\1/2\ 7 7 7Pole spacing--transversely (in feet)............ 6\1/2\ min 7\1/2\ min 8\1/2\ min 6\1/2\ 10 10Ledger spacing--vertically (in feet)............ 7 7 7 4\1/2\ 4\1/2\ 4\1/2\--------------------------------------------------------------------------------------------------------------------------------------------------------
Table E-2--Specifications for Side Rails of Ladders------------------------------------------------------------------------
Cross section (in inches)
Length (in feet) ---------------------------
At ends At center------------------------------------------------------------------------15.......................................... 1\7/8\x2\3/ 1\7/8\x3\3/
4\ 4\16.......................................... 1\7/8\x2\3/ 1\7/8\x3\3/
4\ 4\18.......................................... 1\7/8\x3 1\7/8\x420.......................................... 1\7/8\x3 1\7/8\x424.......................................... 1\7/8\x3 1\7/8\x4\1/
2\------------------------------------------------------------------------
Table E-3--Specifications for the Construction of Horses------------------------------------------------------------------------
Height in feet
Structural members ------------------------------------------
<=10 10<=16 16<=20------------------------------------------------------------------------
inches inches inchesLegs......................... 2x4 3x4 4x6Bearers or headers........... 2x6 2x8 4x6Crossbraces.................. 2x4 2x4 2x6
or
1x8Longitudinal braces.......... 2x4 2x6 2x6------------------------------------------------------------------------
Table E-4--Safe Center Loads for Scaffold Plank of 1,100 Pounds Fibre Stress--------------------------------------------------------------------------------------------------------------------------------------------------------
Lumber dimensions in inches
Span in feet --------------------------------------------------------------------------------------------------------
A B A B A B A B A B--------------------------------------------------------------------------------------------------------------------------------------------------------
2x10 1\5/8\x9\1/ 2x12 1\5/ 3x8 2\5/8\x7\1/ 3x10 2\5/8\x9\1/ 3x12 2\5/
2\ 8\x11\1/2\ 2\ 2\ 8\x11\1/2\
(A)--Rough lumber.(B)--Dressed lumber.
Table G-1--Number and Spacing of U-Bolt Wire Rope Clips------------------------------------------------------------------------
Number of clips
Improved plow steel, rope diameter, ---------------------- Minimum
inches Drop Other spacing,
forged material inches------------------------------------------------------------------------(\1\).................................. ......... ......... .........\1/2\.................................. 3 4 3\5/8\.................................. 3 4 3\3/4\\3/4\.................................. 4 5 4\1/2\\7/8\.................................. 4 5 5\1/4\1...................................... 4 6 61\1/8\................................. 5 6 6\3/4\1\1/4\................................. 5 7 7\1/2\1\3/8\................................. 6 7 8\1/4\1\1/2\................................. 6 8 9------------------------------------------------------------------------\1\ Three clips shall be used on wire size less than \1/2\-inch
diameter.
Table G-2--Maximum Allowable Wear at Any Point of Link------------------------------------------------------------------------
Maximum allowable
Chain size in inches wear in fraction
of inches------------------------------------------------------------------------\1/4\(\9/32\)........................................ \3/64\\3/8\................................................ \5/64\\1/2\................................................ \7/64\\5/8\................................................ \9/64\\3/4\................................................ \5/32\\7/8\................................................ \11/64\1.................................................... \3/16\1\1/8\............................................... \7/32\1\1/4\............................................... \1/4\1\3/8\............................................... \9/32\1\1/2\............................................... \5/16\1\3/4\............................................... \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]