Trapped Pressure in Valve

Cause & Consequence

• Uncontrolled release of a flammable gas or liquid

Incident Location

Drilling unit

Incident Activity

Any Activity Type

Incident Info Source

ENFORM

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.