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.
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.
Generator turbine fuel gas manifold.