Cause & Consequence
- Moving machinery or material being machined
Any Location Type
Lifting, crane, rigging, deck operations
WHAT CAUSED IT:
Crane personnel made the decision to attempt to pick up the stairs at a difficult angle due to the placement of hydraulic fracturing tanks and pallets of mud in front of the rig. This caused the crane to be over-extended and excessively boomed down.
Line of sight restriction between the crane operator and the rigger resulted from obstructions.
The chokers and chains were not adjusted to allow the angle of the steps to come up without first being in a bind.
The rigger failed to recognize the potential of the steps to come loose and to position himself accordingly.
CORRECTIVE ACTIONS: To address this incident, this company did the following:
All employees were reminded to ensure that there is adequate room to make the lift safely.
Riggers were reminded to ensure that the rigging is properly positioned over the center of gravity of the load and the boom and rigging is properly adjusted at the correct angle for the lift.
Crane operators and riggers were instructed to ensure that the line of sight is not obstructed.
Riggers were instructed to check their position during each lift and ensure they have an escape route.
Riggers were reminded to consider what could happen when items are in stress/bind or stored energy is released.