• Published: 28 Jun 2011
  • Incident ID: 3357

Improperly Mounted Rig Floor Winch Results in Hi-Potential Near Hit

Cause & Consequence

  • Handling, lifting or carrying
Incident Consequence
Not Assigned

Incident Location

Drilling unit

Incident Activity

Drilling, workover

Incident Info Source

International Association of Drilling Contractors

Specific Incident Equipment

4500kg floor winch

Lessons Identified

  • The origina winch base did not have the same design bolt pattern as the base holding plate and required modification before use (holes were misaligned).
  • Failure to recognize situation as requiring Management of Change (MOC) controls.
  • Undersized bolts used to secure the winch to its base failed under load.
  • There was no follow-up inspection record of the modification or load testing performed.
  • Wrong team members were involved in the installation.

Incident Recommendations

  • Check all lifting equipment before use for damage or potential mechanical failure.
  • Follow Management of Change (MOC) process to plan the scope of work and who needs to be involved at each phase.
  • Renewal and modifications to equipment are to be checked by OIM, Mantenance Supervisor and QHSET Officer at a minimum (Tourpusher to be included for drilling equipment and barge engineer for marine equipment.
  • Any load bearing equpment should be load tested to SWL before use.

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