Under the
approved Code of Practice for Load Lifting & Rigging, slings assembled with wire rope clips are
not to be used for lifting
To comply with manufacturer’s specifications
the correct number of clips must be installed correctly and tightened to the correct torque
using a torque wrench. The correct installation technique is shown below.
When fitting clips “Don’t straddle a dead horse”.
A visual inspection should be carried out prior to and
during use.
Wire rope clips should be inspected before use to ensure
that:
•
all markings are legible;
• the wire rope clip is free from nicks, gouges and cracks;
• a wire rope clip with the correct dimension has been selected;
• never repair or reshape a wire rope clip by welding, heating or bending as this may affect the performance.
• the wire rope clip is free from nicks, gouges and cracks;
• a wire rope clip with the correct dimension has been selected;
• never repair or reshape a wire rope clip by welding, heating or bending as this may affect the performance.
The wire rope clip should be fitted to the wire rope as
shown in the diagrams below. The bridge of the wire rope clip should always be
placed on the load bearing part of the rope. The U-bolt of the clip should be
placed on the rope tail, also known as the “dead end” of the rope.
Turn back enough wire rope length so that the required
minimum number of clips can be installed according to the instructions below.
The first clip must be placed one bridge width from the
turned back rope tail or dead end of the rope, according to figure 1. Tighten
nuts to the specified torque.
The second clip must be placed
immediately against the thimble but nevertheless in such a position that the correct
tightening of the clip does not damage the outer wires of the wire rope (figure
2). Tighten the nuts firmly but not yet
to the specified torque
The following clips should be placed on
the wire rope between the first and second clip in such a way that they
are separated by at least 1½ times the clip-width with a maximum of 3 times the
clip-width according to figure 3.
Apply light tension on the rope and tighten all nuts
evenly, alternating until reaching the specified torque.
During assembly and before the rope is taken into service,
the nuts must be tightened once again to the prescribed torque. After the load
is applied for the first time, the torque value must be checked again and
corrected if necessary. Periodically re-tightening of the nuts must be done at
10.000 cycles (heavy usage), 20.000 e.g. every 3 months, 6 months, annually.
The torque values and the minimum number of clips to be
applied, in relation to the rope size, are given in the following tables.
Table 1, Wire rope clips required number and torque value
|
Diameter
|
Diameter
|
Min no of clip required
|
Length of rope to turn back
|
Torque value
|
Torque value
|
|
Inches
|
mm
|
|
|
Nm
|
Ft. Lbs
|
|
1/8
|
3-4
|
2
|
85
|
6.1
|
4.5
|
|
3/16
|
5
|
2
|
95
|
10.2
|
7.5
|
|
1/4
|
6-7
|
2
|
120
|
20.3
|
15
|
|
5/16
|
8
|
3
|
133
|
40.7
|
30
|
|
3/8
|
9-10
|
3
|
165
|
61
|
45
|
|
7/16
|
11-12
|
3
|
178
|
88
|
65
|
|
½
|
13
|
3
|
292
|
88
|
65
|
|
9/16
|
14-15
|
3
|
305
|
129
|
95
|
|
5/8
|
16
|
3
|
305
|
129
|
95
|
|
¾
|
18-20
|
4
|
450
|
176
|
130
|
|
7/8
|
22
|
4
|
480
|
305
|
225
|
|
1
|
24-25
|
5
|
660
|
305
|
225
|
|
1 1/8
|
28-30
|
6
|
860
|
305
|
225
|
|
1 ¼
|
32-34
|
7
|
1120
|
488
|
360
|
|
1 3/8
|
36
|
7
|
1120
|
488
|
360
|
|
1 ½
|
38-40
|
8
|
1370
|
488
|
360
|
|
1 5/8
|
41-42
|
8
|
1470
|
583
|
430
|
|
1 ¾
|
44-46
|
8
|
1550
|
800
|
590
|
|
2
|
48-52
|
8
|
1800
|
1017
|
750
|
|
2 ¼
|
56-58
|
8
|
1850
|
1017
|
750
|
|
2 ½
|
62-65
|
9
|
2130
|
1017
|
750
|
|
2 ¾
|
68-72
|
10
|
2540
|
1017
|
750
|
|
3
|
75-78
|
10
|
2690
|
1627
|
1200
|
|
|
|
|
|
|
|