HCR from ring tight joint on a non-return valve

Cause & Consequence

• Uncontrolled release of a flammable gas or liquid

Incident Location

Fixed Installation

Incident Activity

Production operations

Specific Incident Equipment

Ring tight joint on a non- return valve.

Lessons Identified

• On investigation, the break out results from the stud bolts showed that the bolts were under torqued.

Incident Recommendations

• Ensure close adherence to torqueing procedures and ensure that the torque applied is revalidated when any hydrocarbon system flanges have been broken and made-up. This confirms the requirement to ensure that only competent personnel are involved in the breaking and make-up of bolted joints.