The Danfoss SEM-SAFE High Pressure Water Mist Suppression System is a unique solution in the field of firefighting. Suppression is achieved by spraying water through nozzles at high pressure to create a fine mist.
A single high-pressure pump unit is sufficient for the operation of the system. This SEM-SAFE unit can protect multiple zones. If it is required to expand the system in the future, there is no need to replace the pump unit.
On stand-by, the system maintains a pipe pressure of approximately 12 bars. When the temperature exceeds 57°C, the heat-sensitive glass bulbs mounted in the nozzle heads melt. At this point, the high-pressure pump is automatically activated and water is forced through nozzles at 60 or 100 bar to create a fine mist. Only nozzles with melted bulbs are activated. This means that only the heat-affected area will be actively sprayed.
On stand-by, the system has dry piping. This system will activate manually or when sensors have detected heat, smoke or a flame, depending on type and application. The nozzles are grouped in sections and all the nozzles in the activated section will be released.
In case of fire, the high-pressure pump draws water from the tank on unit, and forces it through a non-return valve to a high-pressure manifold. From here, high pressure water is pressed into the relevant section(s) where fire occurs. Possible increases in pump pressure are continuously controlled by the pressure relief valve.
