• Published: 8 Feb 2016
  • Incident ID: 3890

Pressure release when breaking containment - Safety Moment

Cause & Consequence

  • Moving, flying or falling object
  • Release of a harmful substance

Contributing Factor

  • Complacency
  • Control of work

Description of Process

A blind flange was being removed to replace corroded bolts. The valve was connected to a system which had been previously depressurised.

Description of Incident

There was a sudden, uncontrolled release of pressure when the last retaining bolt was removed. The technician sustained injuries.

Good Practice Guidance

Depressured systems can contain pockets of pressure. This should be covered during the Toolbox Talk to ensure all the team are aware. Control of Work processes and breaking of containment procedures must be followed.

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