COMPENSATING EFFECTS OF INSTALLING A FIXED FIRE FIGHTING SYSTEM

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

COMPENSATING EFFECTS

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.

Valve Icon

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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