Installation of a Fixed Fire Fighting System allows a project owner to avoid or reduce other planned safety investments.


Fixed fire fighting systems are known to significantly reduce the fire heat release rate (HRR) from a tunnel fire. Less known are the compensatory effects of installing a fixed fire fighting system or how to exploit the full potential of the system. The most important compensatory effects are highlighted below.

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Ventilation and critical velocity 

Thanks to the significant smoke reduction and cooling of smokes after activating the Fixed Fire Fighting System:

  • The number or capacity of jet fans can be substantially reduced
  • In certain cases longitudinal ventilation can be used instead of planned semi-transversal, transversal ventilation systems or smoke extraction systems
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Structural protection

Due to the excellent cooling effect of the fixed fire fighting system and its ability to absorb heat from a tunnel fire makes it possible to:

  • Eliminate or reduce planned passive fire protection
  • Allow for lower fire rated components within the tunnel e.g. electrical installations 
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Improved risk analysis

Installing a fixed fire fighting system allows for more sound strategies e.g.:

  • Higher traffic intensity
  • Transport of hazardous and potentially flammable cargo through the tunnel
  • Implementation of safer evacuation strategies

The compensation effect makes it possible to balance the investment of a Fixed Fire Fighting System by recognizing the compensation effects in the total ROI.

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