01.
General
Requirements. (3-31-22)
a. All lines,
shackles, blocks, etc., should be maintained in good condition and shall be of
sufficient size, diameter and material to withstand one and one half (1 1/2)
times the maximum stress imposed. (3-31-22)
b. Wire rope or other rigging equipment which
shows a fifteen percent (15%) reduction in strength shall be replaced.
(3-31-22)
02.
Splices. (3-31-22)
a. Two (2)
lines may be connected by a long splice, or by shackles of patent links of the
next size larger than the line where practical. (3-31-22)
b. A safe margin of line must be used for
making long splices. See Table 353.02.b.
|
TABLE
353.02.b.
|
|
Rope
Diameter
|
Unraveled
|
Total
Length
|
|
3/8"
|
8'
|
16'
|
|
5/8"
|
13'
|
20'
|
|
3/4"
|
15'
|
30'
|
|
7/8"
|
18'
|
36'
|
|
1"
|
20'
|
40'
|
(3-31-22)
03.
Wire Rope Clips or Clamps.
(3-31-22)
a. Clips should be spaced at least
six (6) rope diameters apart to achieve maximum holding power.
See Table 353.03.a.
|
TABLE
353.03.a.
|
|
Diameter of
Rope
|
Number of
Clips
|
Required Space Between
Clips
|
|
1-1/2-inch
|
8
|
10 inches
|
|
1-3/8-inch
|
7
|
9 inches
|
|
1-1/4-inch
|
6
|
8 inches
|
|
1-1/8-inch
|
5
|
7 inches
|
|
1- inch
|
5
|
6 inches
|
|
7/8-inch
|
5
|
5-1/4 inches
|
|
3/4-inch
|
5
|
5-1/2 inches
|
|
3/8 to 5/8-inch
|
4
|
3 inches
|
(3-31-22)
b. Clips should always be attached with the
base or saddle of the clip against the longer or "live" end of the rope. See
Figure 353.03.b. This is the only approved method.
FIGURE 353.03.b.
Click
here to view image
(3-31-22)
c. Do not reverse the clips or stager them.
See Figure 353.03.c. Otherwise the "U" bolt will cut into the live rope when
the load is applied.
FIGURE 353.03.C.
Click
here to view image
(3-31-22)
d. After the rope has been used and is under
tension, the clips should again be tightened to take up any looseness caused by
the tension reducing the rope diameter. Remember that even when properly
applied a clip fastening has only about ninety percent (90%) of the strength of
the rope and far less than that when rigged improperly. (3-31-22)
e. U-bolt wire rope clamps must not be used
to form eyes on running lines, skylines, machine guylines, or straps.
(3-31-22)
04.
Blocks. All blocks must be of steel construction or of material of
equal or greater strength and so hung that they will not strike or interfere
with other blocks or rigging. (3-31-22)
05.
Pins. All pins in blocks
shall be properly secured by keys of the largest size the pin hole will
accommodate (3-31-22)
06.
Shackles. (3-31-22)
a. Spread in
jaws of shackles shall not exceed by more than one (1) inch the size of yoke or
swivel of the block to which it is connected. (3-31-22)
b. All shackles must be made of forged steel
or material of equivalent strength and one (1) size larger than the line it
connects. (3-31-22)
07.
Cable Cutting. Cable cutters, soft hammers, or a cutting torch
shall be available and used for cutting cables. Eye protection must be used
when cutting cable. (3-31-22)
08.
Damaged or Worn Wire Rope. Worn or damaged wire rope creating a
safety hazard shall be taken out of service or properly repaired before further
use. (3-31-22)
