• Published: 23 May 2016
  • Incident ID: 3952

Dropped Angle Iron from Drill Floor Ducting Support

Cause & Consequence

  • Moving, flying or falling object

Backup Contributing Factor

Change management, Control of work

Description of Process

During plug & lubricate (P&L) operations, a four-man team was on the drill floor breaking down a wireline toolstring.

Description of Incident

A piece of angle iron weighing 7.75 kg, used to secure the draw-works exhaust ducting dropped from approximately 12m. The angle iron hit and smashed the re-enforced glass roof of the dog house, bounced 2m laterally (contacting one of the wireline team on their hard hat) and eventually landed a further 2m away on the drill floor.

Immediate Cause:

  • the angle iron fell from the draw-works motor discharge duct after primary fixing bolts had either failed or worked loose.

Underlying Causes:

  • Potential bi-metallic corrosion. Carbon steel bolts were used to secure the stainless steel angle iron section.

  • The failed / loose bolts were not identified during inspection. The ducting inspection work order only called for a general visual inspection from drill floor level.

  • Reliable securing practices were not utilised as evidenced by double nuts used on other parts of the structure.

  • The draw-works exhaust duct is not captured in the weekly derrick inspection as it is owned by the platform maintenance & operations team

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