HIGH PRESSURE
WATERMIST EXPLAINED

Fireworks are specialist designers and installers of water mist fire suppression systems for Residential, Commercial and Industrial Applications.

Imagine a fire fighting system that puts out the fire in seconds, with minimal consumption of water and water damage, giving you the best possible protection. With a high-pressure water mist system fromFireworks – that is exactly what you get. 

THE INTELLIGENT USE OF WATER

High Pressure Water Mist

The investment in fixed installed pure water based fire suppression systems often counts for less than 1% of the total investment in a new building and can mean a major reduction in insurance premiums (in some cases up to 70%). In buildings fully protected by water-based fire suppression systems, 99% of fires are controlled by the suppression system alone, and losses are estimated to be less than 10% compared to unprotected buildings

Heat

To fight a fire, a traditional sprinkler system spreads water droplets over a given area, which absorb heat to cool the room. Due to their large size and relatively small surface, the main part of the droplets will not absorb enough energy to evaporate, and they quickly fall to the floor as water. The result is a limited cooling effect. By contrast, high-pressure water mist consists of very small droplets, which fall more slowly. Water mist droplets have a large surface area relative to their mass and during their slow descent towards the floor they absorb much more energy. A great amount of the water will follow the saturation line and evaporate, meaning that water mist absorbs much more energy from the surroundings and thus the fire. That’s why high-pressure water mist cools more efficiently per litre of water: up to seven times better than can be obtained with one litre of water used in a traditional sprinkler system.

The uniqueness of water mist is that it combines the suppression effect of gas and traditional sprinkler systems. As well as removing the oxygen, it simultaneously cools the fire like a traditional sprinkler and the cooling effect additionally lowers the risk of re-ignition.

Oxygen

The very small droplets in a high-pressure water mist system quickly absorb so much energy that the droplets evaporate and transform from water to steam due to the high surface area relative to the small mass of water. This means that each droplet will expand more than 1,700 times, when getting close to the combustible material, whereby oxygen and combustible gases will be displaced from the fire, meaning that the combustion process will increasingly lack oxygen.

 

 

THE FIRE TRIANGLE

EFFICIENT
COOLING

SURFACE
WETTING

OXYGEN DISPLACEMENT

 

HOW IT WORKS

High pressure water mist

Fireworks specialise in the design and installation of high-pressure water mist systems for industrial and commercial applications and have gained vast experience from many installations throughout the UK over the past 22 years. Due to the nature of the design the system can be retrofitted into existing buildings which gives a number of advantages over the traditional sprinkler design.

The high pressure water mist system comprises three main components:


1. A Pump Unit that takes the water from the public main or reservoir through the tank on the unit through the high pressure pumps to the discharge manifold. The system pressure can range from 60- 130bar.

2. A number of section valves that divides the complete system into different sections depending on the layout and design. The section valves can be operated manually or automatically.

3. A range of different nozzles designed to use the minimum amounts of water and power.

Piping Material:
All installations are undertaken using high class stainless steel which exceeds AISI 316 standard. The material is so soft that it can be bent and the small sizes of pipe mean that they can be shaped with hand tools saving the cost of a large number of fittings and reducing the risk of leakage.

Water Supply:
Water is supplied via either pump units or cylinder systems. This covers small systems of just a few nozzles right up to systems with thousands of nozzles, with or without electrical power.

Water mist system with Closed Nozzles:
On stand-by, the water mist system maintains a pipe pressure of approx. 12 bar. When the temperate exceeds a predetermined value the heat sensitive glass bulbs mounted in the nozzle heads activate and water flows through the nozzle, at this point the high pressure pump is automatically activated and the water is forced through nozzles at high pressure (60 or 100 bar depending on nozzle type) to create a fine mist. Only nozzles with activated bulbs flow water meaning that only the area affected by the heat will be suppressed.

 

LESS DAMAGE

Water mist has many advantages compared to conventional sprinklers.
One of the key benefits is that it often uses only 10% of the water used by a traditional sprinklers protecting the same risk. In addition, the majority of the water evaporates, causing much less water damage to buildings, furniture, electrical installations, etc.
In industrial applications, the dramatic reduction in direct damage is of great value, but it is usually even more important that the production line or factory will be able to resume manufacturing very quickly after the fire.

 

Specially Designed Water Mist Nozzles

Fireworks are distributors of the Danfoss Semco SEM-SAFE® system and the Hydramist® high pressure water mist systems. Their water mist nozzles are based on two different technologies; One is the technology used in the unique Danfoss simplex micro nozzles that has been a speciality for decades. Thanks to the special form of the simplex micro nozzles, the water gains strong rotary motion in a swirl chamber and is almost instantly transformed into a water mist that is sprayed into the fire. The wide spray angle and the specially engineered spray pattern of the micro nozzles enables superior spacing. The droplets formed in the micro nozzles are shaped under a pressure of approx. 100bar and have a size of 10 to 50 micron. In order to maintain its technology-leading position, Danfoss Semco has also developed a new series of high-pressure water mist drilled nozzles. These nozzles are based on patented nozzle designs and methods for generating water mist. To enhance the process of turning water into mist, the holes drilled in the nozzles are partly conical and partly cylindrical. The positioning of the holes is designed to direct the water only towards the places where the fire is, this way minimizing water consumption. The patented method for the hole geometry in the nozzles allows larger spacing and superior distribution of the water droplets, resulting in improved control when suppressing fires. Water is distributed through the drilled nozzle holes at a pressure of 60-100 bar.

 

Unique Pump Design:


Intensive research undertaken by our partner Danfoss Semco has led to the creation of the world’s lightest and most compact high pressure pump unit. Each pump has multi-axial pistons made in stainless steel which is corrosion resistant. The unique design of the pump means that it uses water as a lubricant, eliminating the need for routine servicing. The pump is protected by international patents and is used across many different sectors. They also offer up to 95% energy efficiency.

Highly Corrosion Proof valves:
All of the component parts within the high pressure water mist system are made from stainless steel which are highly corrosion proof and dirt resistant. Also the manifold block design makes the valves very compact allowing for easy installation and ease of operation.

Overview of High Pressure Water Mist systems

How it works:
When water is forced through nozzles at high-pressure, a fine mist is formed that has a two-fold extinguishing effect – it rapidly cools down the fire and starves the flames of oxygen to suppress the fire, reduce damage and prevent re-ignition of the fire.

 

MONEY SAVING SOLUTIONS

  • • With fewer nozzles required thanks to optimized spacing and the need for only one pump unit for all applications installation cost and time as well as required service interventions are considerably reduced.


  • • 30% fewer components compared to other competing systems mean ours is lighter and more compact. This allows for easier installation, simplified maintenance and 
valuable space saving.


Cost of water supply is significantly reduced due to less piping, reduced water demand from the water supply. High Pressure water mist systems use up to 50% less water when compared to low pressure water mist systems and up to 80% less water when compared to traditional sprinklers.

 

LESS DAMAGE

Less DamageWater mist has many advantages compared to conventional sprinklers.
One of the key benefits is that it often uses only 10% of the water used by a traditional sprinklers protecting the same risk. In addition, the majority of the water evaporates, causing much less water damage to buildings, furniture, electrical installations, etc.
In industrial applications, the dramatic reduction in direct damage is of great value, but it is usually even more important that the production line or factory will be able to resume manufacturing very quickly after the fire.

 

Water mist A long period of down-time in production means a high risk of losing market share,

which often results in a dramatic long-term negative economic effect, far in excess of the original fire damage.

Statistics show that only 4 out of 10 industries are able to start manufacturing goods again after a major fire.

 

 

WATER MIST EXTINGUISHING SYSTEMS INCLUDE

  • Hotels
  • Hospitals
  • Archives
  • Data Centres and Server Rooms
  • Food industry
  • Restaurants
  • Prisons
  • Custodial Suites
  • Paint booths
  • Biomass Industry
  • Test engine cells
  • Car parks

NEED US URGENTLY?

For more information contact us on 01953 458420 or email enquiries@fireworks-ltd.com