17.5.2 Rating for Various Modes of Use
Always ensure that slings of sufficient capacity are selected, and that careful consideration is given to the mode of assembly. The marked working load limit of the roundsling must be multiplied by the appropriate mode factor to obtain the SWL for the particular mode of assembly and this SWL must not be exceeded. Various modes of assembly, mode factors and SWLs are given in the following tables:
SWL tonnes (t) | |||
|---|---|---|---|
Straight pull = WLL  Figure 17.5.2-1 M = 1 | Choked  Figure 17.5.2-2 M = 0.8 | Basket (legs parallel)  Figure 17.5.2-3 M = 2 | Basket 0 - 45° to the vertical  Figure 17.5.2-4 M = 1.4 |
1 | 0.8 | 2.0 | 1.4 |
2 | 1.6 | 4.0 | 2.8 |
3 | 2.4 | 6.0 | 4.2 |
4 | 3.2 | 8.0 | 5.6 |
5 | 4.0 | 10.0 | 7.0 |
6 | 4.8 | 12.0 | 8.4 |
8 | 6.4 | 16.0 | 11.2 |
10 | 8.0 | 20.0 | 14.0 |
10 + | |||
With multi-leg slings, it should be noted that the individual roundslings forming the legs will be colour coded for their own working load limits and not that of the sling assembly. As with single slings, the SWL for the particular sling configuration is obtained by multiplying the working load limit of a single endless leg by a mode factor. #id-ec70f5a1-4e20-4c49-9679-1f8e626d5cfc__id-e624adc0-50ad-496a-a125-6148ade671c2 gives the SWLs for two leg and four leg slings having identical legs.
SWL load tonnes (t) | ||
|---|---|---|
Straight pull per leg (equal to WLL of a single sling) M = 1 | Two leg sling 0-45° to vertical M = 1.4 | Four leg sling 0-45° to vertical M = 2.1 |
1 | 1.4 | 2.1 |
2 | 2.8 | 4.2 |
3 | 4.2 | 6.3 |
4 | 5.6 | 8.4 |
5 | 7.0 | 10.5 |
6 | 8.4 | 12.6 |
8 | 11.2 | 16.8 |