Fuel gas leak

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Alert ID: 
Description of Task: 

On 18th December 2013 a 20% LEL low gas alarm on the main fire and gas panel activated in a generator turbine enclosure.  The alarm reset immediately.  The generator was shutdown to allow fault finding and investigation of the potential leak path.  A damaged/fretted fuel gas flexible hose was quickly identified as the probably source of the leak and was subsequently replaced.

Then on 22nd December 2013 during the re-commissioning of the fuel gas system, two 20% LEL gas detectors came into alarm activating the plaform general alarm.  The generator was being re-commissioned after replacing the defetctive flexi hose.

Further investigation of the generator package identified that the leaks had come from a hairline crack on the fuel gas manifold.

Lessons Identified: 

Don't assume your immediate finding is the root cause.  Further investigation may identify the underlying root cause the prevent recurrence.

  • Check other hoses in generators for evidence of fretting against steelwork;
  • Survey generator packages with similar fuel gas manifolds for signs of stress and/or potential failure;
  • Implement the use of FLIR camera when carrying out service testing of generator packages post intrustive maintenance.
Specific Equipment: 

Generator turbine fuel gas manifold.

Incident consequence: 
Hydrocarbon release
Any Activity Type
Fixed Installation
Cause of accident or incident: 
Not Assigned