Project Details

Risk-Based Fire and Gas Mapping


Example of a jet fire from production riser. Early leak detection before ignition of the leak is of paramount importance

Example of a jet fire from production riser. Early leak detection before ignition of the leak is of paramount importance.

Sava and his team carried out a risk-based review of the Fire and Gas Detection system of an offshore facility. Fire and flammable gas detection facilities are traditionally designed by fire and gas detection mapping where locations of detectors are based on equipment locations. The risk-based review applied an integrated risk- and analysis- based detection design. This work brought together technical information from the numbers, frequencies and locations of potential leaks, the sizes of gas clouds and fires to be detected, detection performance criteria (checked back-to-back with respect to potential explosion loadings), detector vendor data (for the compositions of the leaking hydrocarbons with respect to the selected detectors), time-dependent probabilities of ignition, consequences of explosions and fires, escape and evacuation of personnel, etc.

The review resulted in the change of location of a substantial number of detectors with the following benefits:

  • Higher speed of detection;
  • Improved reliability of detection;
  • Reduced probability of ignition of the leaking hydrocarbons;
  • Reduced consequences (fewer and/or less severe) of the accident;
  • Improved control of the accident;
  • Improved safety of the accident;
  • Integration of engineering subjects as relevant to fire and gas detection with all the positive effects these may have;
  • Substantial cost-efficient risk reductions to as low as reasonably practicable (ALARP) (where the costs of ALARP actions were practically none).

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