Offshore Crane Operator Safety
#Rig_Inspection_Workshop

Crane checklist (relevant for MODUs) :
• Record the date of the last crane diesel engine overhaul.
• Check the date of the last slewing brake test.
• Ensure that the aircraft warning lights in the boom and A-frame are working (API Spec 2D appendix C).
• Ensure a windsock is fitted.
• Check the condition of the A-frame ladders.
• Check the certification of the wires: boom, main and whip wire.
• Check the date of the last load test (Classification Society, Lloyd’s Register, ABS, and DNV).
• Check the last load test by Class (up to 20 tons: SWL plus 25%: from 20 to 50 tons: SWL plus 5 tons: above 50 tons: SWL plus 10%).
• Ensure load cell management and radius/weight alarms are installed and working satisfactorily.
• Verify that NDT inspections of the pedestal, crane boom and blocks are part of the lifting- gear surveys.
• Verify that four-yearly NDT inspections of the slewing (bearing) bolts are carried out (internal and external). Some rig crews do 25% yearly.
• Function-test the high limit switches of the main and whip line, and the high and low limit switches of the crane boom (API Spec 2D app C Section 4.1.2d).
• Verify that only safety glass is used for the crane cabin windows (API Spec 2C Section 12.2).
• Check the records of the last boom pin NDT inspections (API Spec 2D Appendix C).
• Verify that the crane control handles return to the centre position when released (API Spec 2C Section 11.1.2).
• Check the operation of the wire drum braking systems (API Spec 2C Section 8).
• Verify that the friction brakes are fitted with rain guards (API Spec 2C Section 13.3).
• Verify that the sheave sizes are no less than eighteen times the diameter of the wire rope (API Spec 2C Section 7.4.1.1).
• Verify that there is a load chart in the crane cabin (API Spec 2C Section 4.2).
• Verify that an emergency stop for the crane engine is available, that it is operated from the crane cabin and is in working condition.
• Check the correct installation of wedge-type sockets, paying particular attention to the wire clamps (API Spec 2C Section 7.3.3).
• Verify the land rig crane procedures: only allow lifting when the support legs are extended and secured.
• Check that there is a procedure to ensure that land rig cranes are not allowed to move while there is a lift hanging in the crane.
• Note some cranes are now built to lift and carry.
• Land rig cranes require to follow the rules and requirements of the local authorities and the drilling contract.

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