GUIDELINES FOR MARINE LIFTING & LOWERING OPERATIONS 0027/ND Rev 11 Page 47 of 84 13.8.2
Accessible areas within the swing radius of a rotating crane and counterweight shall be barricaded to
prevent personnel from being struck or crushed by the counterweight.
13.8.3
A minimum clearance distance of 600 mm is to be maintained at all times between the slewing part of the
crane and adjacent hazard or structure to prevent potential crushing of personnel.
13.8.4
Crane tracks should be marked and the surface levelled/improved if required.
13.8.5
A thorough check for obstructions in way of the cranes, structure and rigging should be carried out.
This also applies to overhead lines and the minimum clearance requirements to overhead lines (e.g.
power lines) shall be in accordance with local or national requirements.
13.8.6
It shall be ensured by surveys and monitoring (e.g. crane boom radius/boom angle, load readings,
structure level etc.) that all allowable load assumptions are properly accounted for (see Sections 13.7.3
to 13.7.7). For roll-up operations, monitoring should include:
a)
Lifted/upended object deflections
b) hoist line angles
c) crane positions
d) reaction loads/behaviour in roll up cells
e) roll-up angle
f) clearances e.g. of the structure to crane booms
13.8.7
Where relevant, additional considerations for offshore lifts will be applicable for onshore lifting
operations. Details for these can be found in Section 18.
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