Severity
Incident
Leak
Yes
Ignition
No

The contractor was replacing a needle valve and a check valve on the nitrogen purge line to the dispenser because of a small leak at the connection between the needle valve and the check valve. On reinstalling the valves, the contractor installed the check valve backwards, causing the pressure disk in the regulator to fail, venting about 1000 psig hydrogen into the air for about 10 seconds. This was found during testing of the contractor's work before the system was returned to normal service.

Incident Date
Feb 24, 2006
Equipment
  • Piping/Fittings/Valves
  • Valve
Damage and Injuries
Contributing Factors
When Incident Discovered
Lessons Learned

Proper installation of check valves and other equipment should be visually inspected prior to pressurization.