• Published: 22 Aug 2011
  • Incident ID: 3376

Trapped Pressure in Valve

Cause & Consequence

  • Uncontrolled release of a flammable gas or liquid
Incident Consequence

Incident Location

Drilling unit

Incident Activity

Any Activity Type

Incident Info Source


Specific Incident Equipment

  • Pressure Check valves and Pressure Control Valves

Lessons Identified



Zero energy

was not achieved during the isolation process

• Section of pipe without bleed-off could potentially have trapped pressure

Incident Recommendations


Review piping systems to ensure small sections between isolation valves can be de-pressured and to identify areas with no bleed-off valves.

• Ensure these sections of piping can be safely de-pressured and

zero energy

can be verified.

Rate this alert

Average Rating

Latest Alerts & Moments

Our searchable catalogue of hundreds of Safety Alerts and Safety Moments are all designed as learning resources that can help improve workplace safety.