XFlow Water Mist System

What makes XFlow® technology different?

The secret of the Unitor XFlow technology is a combination of fine water droplets and water mist, giving optimal system performance. The water droplets cool the surface preventing reignition, while the mist encapsulates the fire and suffocates it by restricting the oxygen flow. The droplets stabilize the mist extinguishing the fire with minimum damage to machinery and other vital installations. This makes the system more efficient for certain types of fires compared to high pressure water mist systems, even though both systems have to pass the same tests. The Unitor Xflow water mist system can be released immediately when a fire is detected. There is no need to evacuate the protected room before release, as water represents no risk to humans or the environment. Because the fire figting system can start immediately, the risk of the fire spreading is significantly reduced.

Where can the systems be used?

Total flooding fire extinguishing: The Unitor XFlow water mist system is designed to protect machinery spaces of Category A. It is suitable for use in engine rooms, turbines, enclosures, paint booths, cable ducts, switchboard installations and other enclosed spaces. The Unitor water mist system provides reliable fire protection based on the newest technology. Local application fire protection: The Unitor XFlow local protection water mist system is a localised fire extinguishing system for internal combustion machinery in Category A spaces.

Advantages include:

The local protection unit is supplied as plug and play, ready to connect to water, power, pumps, and pipes. It has Type approved heavy duty non-corrosive section valves, whilst the nozzle heads are protected in stand-by position. The Dry pipe system uses very small amounts of water for immediate release, with a maximum pressure of 16 bars. The Unitor XFlow System can be supplied as part of the total flooding or accommodation system. The system meets the requirements of MSC/circ. 1387 type and certification IMO Circ.913

Accommodation fire fighting

The Unitor XFlow accommodation water mist system consists of a number of water mist heads mounted in a wet pipe system. Each water mist head works automatically and independently. Advantages include: The water mist head is concealed in the ceiling and only visible when activated, whilst the nozzle has an elegant Danish design and comes in a variety of different materials & colours. Standard components are based on a maximum system pressure of 16 bars. Minimal installation costs and maintenance. Fixed water-based water mist system designed in accordance with SOLAS chapter II-2 and Res. A.800 (19)

System Design and Configuration

For engine room systems, the nozzles are mounted in a dry pipe system and released in sections through a total flooding system or as individual objects through local fire fighting systems. The system activation for a section is done manually from release stations in connection with the protected area or remotely from a release panel located at a fire control station, ECR or wheelhouse. For accommodation areas, the nozzles are mounted in a wet pipe system and each water mist nozzle work automatically and independently. The nozzles activate when the fire reaches a certain temperature. The water mist is confined to the area or object affected by the fire, and the system can be activated without closing all vents and full evacuation of staff. When a water mist nozzle is activated, water starts flowing through the pipes, causing the pressure to drop and the pumps to start. This triggers an optical and acoustic alarm on the bridge. The Unitor XFlow water mist system uses water from the vessel’s freshwater tank. The system is also connected to seawater for back up operations. No dedicated storage space is required, increasing the overall productive space available on your vessel.

Extinguishing Fire Using Water Mist

The Unitor XFlow water mist system creates a mist of fine water droplets. Droplets in variable sizes circulate in the airflow, suppressing the supply of oxygen and absorbing the heat energy, and thereby breaking the chain of combustion. Water is an effective agent for fire fighting as it is readily available and environmentally friendly. When water is added as mist it is most efficient at reducing and dissipating heat and thereby controlling, suppressing and extinguishing a fire.


The Unitor water mist system provides reliable fire protection based on the newest technology and gives you a number of advantages: Quick release - The system can be released immediately without evacuation as it is harmless to crew and machinery. This reduce the risk of damaging surrounding equipment. Compact design - The Unitor water mist system uses water from the vessel’s fresh water tank, with a backup connection for seawater. No dedicated storage space is required, increasing the overall productive space available on your vessel. Low water consumption - The XFlow water mist nozzle has fire suppression and water distribution capabilities similar to those of high pressure systems. It uses a dry pipe system with minimal water consumption which means low power demand, and minimal water damage and clean-up cost. Higher safety level - The XFlow nozzle soaks the affected area(s) with a penetrating mist that extinguishes the fire quickly. In addition, the system uses fresh water with the fire mains as back up for safe return to port, in accordance with low pressure requirements. Standard components - The Unitor water mist system uses a water mist nozzle with low working pressure and low water flow. The pipe system components such as fittings and valves are standard components, keeping installation and maintenance costs low.


The Unitor XFlow® water mist system gives you low pressure, standard pumps and piping, with Immediate release, and no need to evacuate. It is less sensitive than a high pressure system, with less costly components, installation and maintenance. The secret of the XFlow technology is the mix of very small and small droplets, giving unique cooling effect and oxygen displacement

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     Technical Drawings 

     LAFF, TF & ACC Drawing

     LAFF & TF Drawing 

     LAFF Drawing