Applications – Transportation – Tunnels – Tunnel systems

Three pre-engineered HI-FOG^® systems are available for tunnels. Each system is designed for different space characteristics and water availability.

HI-FOG^® spray head system

 

 

The HI-FOG^® spray head system is the normal solution for most tunnels. The system uses zone valves to divide the protected area into pre-defined zones. When a fire is detected, the system attacks fire by activating the zone in which the fire is located as well as the two adjacent zones. Within seconds of activation, the temperatures near the fire drop radically.

Zone length varies according to the fire risk assessment and tunnel conditions. In principle, all three zones are activated simultaneously. Depending on dimensioning and operational requirements, more zones can be activated.

HI-FOG^® sprinkler system

 

 

The HI-FOG^® sprinkler system is designed for tunnels with sections that are significantly wider than average and where there is a very limited water supply. The guiding design principle of the HI-FOG^® sprinkler system is to restrict activation to the immediate location of the fire and thereby conserve water.

In stand-by mode, the HI-FOG^® sprinkler heads are covered by a protective cap to prevent premature activation. When the fire detection system detects a fire and pinpoints its location, pressure builds in the system. The protective caps are released from the HI-FOG^® sprinkler heads, exposing the heat sensitive bulbs. The bulbs in the immediate location of the fire burst, releasing the HI-FOG^® water mist.

HI-FOG^® hybrid system

 

The HI-FOG^® hybrid system is best for tunnels with wider than average sections and where the water supply is limited. This system provides flexibility in covering, for example, areas with multiple lanes merging or emergency areas.

The HI-FOG^® hybrid system is equipped with both HI-FOG^® sprinkler and spray heads, distributed in a mixed pattern over the zones of coverage. The HI-FOG^® spray heads activate across the three zones relevant to the fire, triggered by the fire detection system, preventing the fire from spreading. The HI-FOG^® sprinkler heads attack the fire in its precise location, activating when the ambient temperature bursts the heat-sensitive bulbs. The net result is effective fire suppression with reduced overall water consumption.

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