Derrick Collapse
Although not a common occurrence, derrick or mast collapse most frequently happens during rigging-up and rigging-down procedures.
Derrick Collapse
- The greatest strains are exerted on the mast components during these operations.
- Derrick frames subjected to abuse during movement may be damaged and wrecked.
- Inspection of the derrick structure is important for the detection of weld weakness, oxidation, and bent members.
- Weight indicators and recorders allow the driller to stay within mast load tolerances; consequently, they must be maintained and inspected.
- Manufacturers' rig capacities and guying requirements should always be followed.
Knowledge Check Choose the best answer for the question.
3-7. Although not a common occurrence, when do most derrick or mast collapse happen?
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