A Pre-Action Water Mist System is a system which employs automatic and closed-type water mist nozzles connected to a piping system that contains air rather than water and has a supplemental system of detection serving the same area of protection. In these systems, the water is prevented from entering the piping by a pre-action valve. When the detection system is activated by the heat or smoke detectors, an electric signal is sent to the releasing solenoid and the valve opens. The water then fills the pipe and is ready to flow through the water mist nozzles that are activated. These systems are typically used in applications where an accidental discharge of water would be catastrophic, such as computer servers, telecommunications equipment, and high voltage electrical components.

The primary difference between a Pre-Action Water Mist System and a Pre-Action Sprinkler System is the piping. A Pre-Action Water Mist System requires non-ferrous piping (cpvc, copper, or stainless steel). Non-ferrous piping is corrosion resistive, so the system will not have the “dirty” black water commonly found in standard sprinkler systems. A Nitrogen Inerting System is not required on a Pre-Action Water Mist System, since there is no corrosion.

Properly designed, installed, and maintained systems is key to their proper operation. BFPE International can assist you with making the right choice of Water Mist System for your application. We appreciate the opportunity to design, install, service, and test & inspect your system.

Contact BFPE International for a Pre-Action Water Mist System. Please see the other Products and Services we offer, as well as our Total Fire Protection Agreement.