Water Mist Solutions

Firefly PowerImpact™ extinguishing is used in process ducts and chutes, it has a unique design spraying from different directions into a chute or duct utilising Full cone spray nozzles. Large water droplets for more momentum and penetration with a minimum of three water nozzles and solenoid valves per zone. Each water nozzle uses a Quick-connection and flexible hose that makes it easy to test the system without releasing water into the process

Firefly Water Mist Suppression Systems have remarkable flame suppression capabilities, utilising a small amount of water. The unique design of the hydraulic system enables a very quick system response time.



Why FireFly – Water Extinguishing 

PowerImpact extinguishing™

Firefly provides high-speed and powerful full-cone extinguishing with a unique nozzle design and placement from different directions aimed to penetrate and cover the entire material flow inside a pneumatic conveying system or chute.

Conventional extinguishing systems use hollow-cone spray nozzles with relatively small water droplets, often installed only from one direction. Consequently, conventional extinguishing provides less ability to penetrate the entire material flow and can leave uncovered areas inside a pneumatic conveying system or chute.

Water Extinguishing in Ducts 

Fire Extinguishing in Ducts Standard Spark Detection
  • Full cone water spray
  • Big water droplets are used to get momentum and enough force to penetrate the air speed and the material in a transport duct
  • Hollow cone water spray. No water in the centre of the spray zone.
  • Smaller water droplets that will follow the air flow.
  • Firefly always use water nozzles from different directions in the duct to cover the entire cross section of the duct or chute.
  • Water nozzles normally located from one direction – the entire cross section of the duct or chute will not be covered.
  • Firefly always use one solenoid valve on each water nozzle thus reducing any reaction time or delay.
  • One solenoid valve will activate up to three water nozzles.
  • Water nozzles with quick release functionality.
  • The system can be tested without spraying water into the process.
  • Fixed water system.
  • Water will be injected into the process when testing the system.

Water Extinguishing for Pressers and Planers

Firefly – Water Mist   Other Manufacturing
  • Average droplet size approximately 120 micron.
  • Smooth cooling effect – less risk of thermal shock.
  • Minimal water usage.
  • Deluge systems have too large water droplets and require larger water volumes to achieve the same extinguishing effect.
  • There is a risk for rapid cooling of the press construction, steel belt and Planer motors.

Water Extinguishing 

Process industries generally handle large material flows; from hundreds of kilos up to hundreds of tons per hour. High flows of compact material demand a powerful extinguishing which is able to fully penetrate these flows.

Water is the most common method of extinguishing. However, dangerous particles can also be eliminated by means of mechanical diversion, isolation, steam or gas in applications where water is not suitable for use in the process.

If you use water extinguishing to protect your process from fires and dust explosions:

  • Require extinguishing from different directions in order to secure full coverage of the entire cross-section of a duct or chute.
  • Extinguishing needs to be powerful enough to penetrate also large and compact material flows.
  • Extinguishing needs to react within milliseconds after detection.
Firefly Water Mist Solutions

Application Note – Fast Water Mist Systems

How does Water Mist work?

The small water droplets will evaporate into steam

  1. COOLING – when turning into vapor, the water mist absorbs more heat from the fire than any other extinguishing agent (>2 MJ/kg)
  2. INERTING – when evaporating, the water particles expand by 1700 times, thereby displacing the oxygen
  3. HEAT ABSORBTION – the water mist will ”block” the heat transfer from the fire
Firefly Water Mist Solutions

Critical water droplet size

  • Smaller water droplets have a larger specific surface area and a quicker evaporation – More efficient extinguishing!
  • This means that smaller water droplets have a more efficient usage of the water volume – Less water can be used!


  • Too small water droplets have less momentum and could follow the thermic airflow from the press
  • Too large water droplets require larger water volumes to achieve the same extinguishing effect and there is a risk for rapid cooling of the press construction and steel belt

1 Litre of Water

Droplet Size (mm) No. of Droplets Surface Area (m2)
1 1 900 0.6
0.1 1 900 00 6
0.01 1 900 000 000 60

Water Extinguishing

Full cone water spray

Used in pneumatic ducts of fall chute, to penetrate the airflow or material flow

Full cone water spray Water nozzles WNSXXQC:

Note that nozzles WNS means wide spray angle (110°)

This is the normal nozzle we use

WNS50QC:          50 lit/min (used when less water is required)

WNS75QC:          75 lit/min (Standard nozzle for dust extraction ducts)

WNS90QC:          90 lit/min (Standard nozzle for material transport ducts OR fall chutes)

WNS120QC:       120 lit/min (Used for black powder applications)

Full cone water spray Water nozzles WNXXQC:

Note that nozzles WN have a narrower spray angle (60°). The spray distance from these nozzles will be longer. This can be used in larger ducts of very dense material flow where we need to penetrate the material flow.

Note that we often need to compensate with more nozzles due to the smaller spray angle

Available nozzles: WN50QC, WN75QC, WN90QC and WN120QC

Firefly Water Mist Solutions
Firefly Water Mist Solutions

Firefly Certificates & Approvals

Hover Box Element

Click edit button to change this text. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Other Extinguishing Methods

Firefly offers a wide variety of methods for extinguishing, isolation or diversion of ignition sources for processes where the use of water is not suitable.

Firefly’s ultra-fast isolation and diverter valves are known for their high quality and superb functionality and are available in many types and sizes. CO2 gas is often used in combination with isolation valves to inert the isolated process volume.

Also other extinguishing methods such as inert gas, foam, steam or other chemical agents can be included in Firefly’s system solutions.

Firefly Water Mist Solutions
Firefly Water Mist Solutions
Firefly Water Mist Solutions