Incident alert

LOCATION:
OTHER
ACTIVITY:
MAINTENANCE & HOUSEKEEPING
SUB ACTIVITY:
N/A
ALERT STATUS:
Normal
DATE ISSUED:
06/03/2009
INCIDENT No:
00218

TITLE
Dangerous Situation: Incorrectly Mounted Crab
COUNTRY OF ORIGIN
United Kingdom
ACCIDENT / INCIDENT DETAILS
What happened?

•A pair of crane crabs were suspended in preparation for a job in BB 22.

•The nuts were not properly tightened on one of the crabs, allowing the wheels to buckle.

•On the other crab the bolts were not well packed, so that the nut could not be properly tightened, and the wheels could buckle.

•At the start of the job the crabs were not checked for correct mounting.

•During the job a load of 2200kg was suspended from the crabs. The load shifted the wheels, so that the load could have fallen.
ACCIDENT / INCIDENT IMAGES
Click image to enlarge

These nuts were not properly tightened, so that the wheels were leaning under load.
Click image to enlarge

There is only limited thread per bolt, so that it is important to pack the bolts to the maximum. One washer was missing so that the nut reached the shoulder and could never be fully tightened.
LEARNING POINTS / ACTIONS TAKEN
Recommendations:

•When starting a job, always check the material to be used for testing, positioning, execution.

•Do not assume that a situation is safe, but determine for yourself whether it is safe. It is up to you to decide whether you find something is safe or hazardous.

•Discuss the working methods with your colleagues in advance.

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LEARNING POINTS / ACTIONS IMAGES




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