Reflex Marine FROG-XT6 - Control of Lifting Assembly

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3.9 Control of Lifting Assembly
The FROG-XT6 is designed to stay firmly on the deck of the vessel whilst passengers are
entering or leaving the capsule. The Crane Operator must maintain slack in the line upon
landing to allow for the vessel movement.
Table 4 Control of lifting assembly
Parameter
Recommendation
Ideal Sling Length
The recommended limits in this section are based on the use
of the standard FROG-XT wire rope lifting assembly length of
30 ft (9 m).
Shorter Slings
For the use of shorter lifting assemblies an additional risk
assessment combined with dry runs should be performed to
establish safe operational routines and weather conditions.
Using a shorter sling set also increases risks associated with
the hook block being in close proximity to the capsule
Table 5 Sling lengths
Sling Length
Recommended
Slack
Allowable Drift
Distance to the
Crane Hook
30 ft
10 ft
22.4 ft
20 ft
20 ft
10 ft
17.3 ft
10 ft
10 ft
8 ft
9.8 ft
2 ft
Figure 5 Lifting assembly slack