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Watermist is a versatile and highly efficient fire-fighting medium. What differentiates Watermist from traditional water based systems is its reduced droplet size. When a droplet of water vaporises, it expands by some 1,600 times. Because heat absorption is a function of surface area and not volume, smaller droplets mean more surface area and therefore faster heat absorption.

Watermist has the unique ability to deliver water as a fine atomised mist. This mist is quickly converted to steam that smothers the fire and prevents further oxygen from reaching it. At the same time, the evaporation creates a significant cooling effect of combustion gases and blocks the transfer of radiant heat. In this way, Watermist combines the fire suppression properties of both conventional water spray or sprinkler systems and gaseous fire suppression systems. However, smaller droplets do not necessarily mean better performance. Droplets must have the necessary momentum to get to the seat of the fire where they rapidly cool, and expand to deny the fire oxygen.

Utilising the unique properties of Watermist, Tyco have designed and developed a low pressure version of WaterMist delivering droplet momentum to the seat of the fire.

Accommodation Watermist

Based on over 100 years fire protection experience the Accommodation Mist system has been designed retaining all of the proven performance and reliability of traditional sprinkler systems, while capturing the efficiency of small water droplets and watermist technology.

The advantage of Accommodation Mist is that mist is achieved at a minimum nozzle pressure of 6 bar (87 psi). This low pressure allows Accommodation Mist to use exactly the same design philosophy and components as a tradi tional system.

Specific savings come from the fact that a minimum of just 33.1 litres (8.7 US gallons) per minute flows from each nozzle. This means less weight, reduced pipe diameter, faster installation and minimal water clean-up. Low operating pressure also gives the option of using pipework of varying materials. Of course water is completely safe for people, equipment and the environment.

The Accommodation Mist system design is based on nozzle coverage, proven by fire tests, rather than specific water application density. Water supply is based on an area coverage of 280m² with maximum installation sizes of 140m². A typical system is divided into installations or zones whereby a single installation does not exceed two vertical decks or cross a main vertical fire zone.

The system is primed with fresh water and pressurised by an air pressure tank. Any drop in system pressure by the operation of one or more Accommodation Mist nozzles will automatically start a dedicated seawater pump, thus providing an inexhaustible supply of seawater.

Machinery Space Total Flood

Tyco has developed a Water Mist System for the Total Flood protection of Machinery Spaces of Category A.

The advantage of Total Flood Mist is that mist is achieved at a minimum nozzle pressure of 8 bar (116 psi). This low pressure allows Total Flood Mist to use exactly the same design philosophy and components as traditional total flood water spray systems.

Specific savings come from the fact that a minimum of just 15.84 litres (4.18 US gallons) per minute flows from each nozzle. This means less weight, reduced pipe diameter, faster installation and minimal water clean-up. Low operating pressure also gives the option of using pipework of varying materials. Of course water is completely safe for people, equipment and the environment.

The system is charged with fresh water taken from the ships potable water supplies and is manually operated from local and remote control stations.

Machinery Space Local Application Mist

Tyco has developed a Water Mist System for the localised protection of equipment within Machinery Spaces of Category A.

The advantage of Local Application Mist is that mist is achieved at a minimum nozzle pres sure of 12 bar (174 psi). The system has been engineered to retain all of the proven performance and reliability of traditional water based systems while capturing the efficiency of small droplets and water mist technology.

Specific savings come from the fact that a minimum of just 16.1 litres (4.25 US gallons) per minute flows from each nozzle. This means less weight, reduced pipe diameter, faster installation and minimal water clean-up. Low operating pressure also gives the option of using pipework of varying materials. Of course water is completely safe for people, equipment and the environment.

The system takes fresh water from the ships potable water supplies and in the case of periodically unattended Machinery Spaces, the system is to have both automatic and manual release capabilities.

Tyco (formerly Mather & Platt) installed the first marine sprinkler system in the UK on board the vessel Princess Maud in 1933. With many years’ experience built on the first success story, Tyco continues to provide the best fire engineering solutions for marine applications.

All systems will be designed to meet the individual needs of our customer and in accordance with IMO & all Marine classification society rules and regulations.

Benefits of WaterMist Systems

  • Less water consump

  • Better penetration & good cooling

  • Smaller pipes, therefore less system weight

  • Quick/low cost refill

  • Long systems life (30 years plus)

How We Can Help

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