Ⅰ. High-pressure Water Mist Fire Extinguishing Technology
High-pressure water mist fire extinguishing system series products include Automatic High-pressure Water Mist Fire Extinguishing System, High-pressure Water Mist Fire Hydrant System, High-pressure Water Mist Fire Separation and Smoke Reduction System.
manual mode and mechanical emergency capable of linking with the automatic fire alarm system. It able to reach long-distance and super high-rise building direct transmission and has stable performance, reliable operation, short response time, convenient maintenance and high performance-price ratio.
HPS high-pressure Water Mist has been widely applied at domestic and overseas, owns thousands of construction projects cases. It is a innovation in the field of fire fighting.
Ⅱ. Comparison of Different Fire Extinguishing Technologies
|
terms |
High-pressure Water Mist |
Low-pressure Water Mist |
Water Sprinkling |
Dry Powder |
Gas |
|
Cooling Effect |
Strongest |
Stronger |
Common |
Common |
No |
|
Smothering Action |
Only in fire source area |
Limited |
No |
Common |
For the whole space |
|
Influence on Human Body |
Safe |
Safe |
Safe |
Stimulating respiratory tract |
Causing asphyxiation of personnel |
|
Pollution to Environment |
No |
Long Extinguishing Time |
Large Water Consumption |
Chemical Pollution |
Causing greenhouse effect |
|
Pre-alarm Time |
Not Required |
Not Required |
Not Required |
Required |
Necessary |
|
Influence on Electrical Components |
Little |
Great |
Great |
Great |
Little |
|
Area Separation Requirement |
Not Required |
Not Required |
Not Required |
Not Required |
Necessary |
|
Rechargeable Cost |
Not Required |
Not Required |
Not Required |
High |
High |
|
Maintenance Cost |
Low |
Low |
Low |
High |
High |
|
Explosion Risk |
No |
No |
No |
Potential |
Potential |
Ⅲ. Advantages
Safety and Environmental Protection: Water is the only fire extinguishing agent and having no damage and pollution to environment, protecting objects and personnels in the protected area.
High Efficient Fire Extinguishment: water mist vaporizes immediately when encountering fire and reduces the temperature quickly, with cooling rate 100 times higher than the ordinary sprinkling system. Also the high-pressure water mist with penetrability can solve the problem of whole space and shelter, and also can prevent the after combustion of the fire.
Purification Action: capable of purifying smoke and exhaust gas to facilitate the safe evacuation of personnels, fire fighting and rescue of the fire fighter.
Radiant Heat Shield: shielding the heat radiation properly to prevent the fire from spreading and quickly control the fire.
Low Water Damage: water consumption is only 1% of the water sprinkling system, preventing the secondary disaster due to large quantity water drainage.
Excellent Electric Insulativity: capable of effectively fighting the fire of the live electrical equipment.
High Reliability: Capable of inspecting the spraying of the system regularly after its installation and the system adopts stainless steel pipe, so it has long service life.
Flexible Configuration: either used as whole space system to protect the whole space or locally used to protect individual facility or certain part of the facility.
Simple Installation: compared with traditional fire extinguishing system, it has small pipe diameter of only 10~50 mm, to make the installation cost reduce correspondingly and save great space.
Convenient Maintenance: with only water as fire extinguishing agent, under normal pressure in the standby state, making the workload and cost of daily maintenance reduce greatly.
Ⅳ. Content Related to Water Mist Standard
The formulation of National Standards of Water Mist Fire Extinguishing System Technical Specification and General specification for Water Mist Fire Extinguishing System will have great influence on the development of high-pressure water mist.
The attending expert group of National Standard of Code for Design of Fire Protection and Prevention for Non-ferrous Metal Enterprises agrees that “the water mist fire extinguishing system has the advantages of safety, environmental protection, high efficiency, water conservation and wide application, and can substitute the fire extinguishing systems such as gas, water sprinkling and water mist. In addition, it has advanced technology, excellent equipment and compact configuration reaching internationally leading level. Therefore, combined with the features of non-ferrous metal industry, it can be applied in the power transformation and distribution system, center control room, information center, cable duct (cable interlayer), diesel equipment, hydraulic system and heavy oil depot, as well as in the area with heavy dust such as shaft and drift and storage yard to degrade dust and purify the environment.”
The National Standard of Code for Design of Fire Protection and Prevention for fossil fuel power plants and substations has definitely stated that the water mist can be applied in the cable interlayer, electro-hydraulic device (except for fire-resistant oil), hydrogen seal oil device, water supply pump oil tank(except for fire-resistant oil), steam turbine oil storage tank(in the power house), coal mill lubricating oil tank, diesel generator room and oil tank, cable tunnel as well as the diesel-driven fire pump room in the fire-pump room.
The Code for Design, Installation and Acceptance of Water Mist Fire Extinguishing System of Henan Province was formally published and implemented on Nov. 1st, 2006.
Ⅴ. Application
1. In archives, museums, ancient building, hospitals, superstores and entertainment places as well as other people-intensive sites
High-pressure water mist system provides ideal fire fighting mode for this sort of buildings. The water damages caused by traditional water sprinkling system sometimes even exceeds the loss of the fire. The high-pressure water mist system utilizes the fire-fighting water in high efficiency to reduce the water damages to the least. Compared with the traditional water sprinkling system, the installation area for fire-fighting pump room is smaller due to the absence of fire-water pool and large fire-water tank. The pipe of 10-50 mm can be installed into the existing buildings or historical buildings conveniently. Compared with gas fire-extinguishing system, high-pressure water mist possesses more advantages.
2. In data center, telecom equipment room and high and low voltage distribution room
These places often have higher fire hazard for the over load of the system or short circuit of electrical apparatus. And once these places break down, it will bring quite a great amount of loss for the society. The burning of electric insulating materials may generate great amount of acidic smoke and carbon particles, the strong corrodibility of which may not only exert negative influence on the circuit board and data carrier but also result the short circuit and the failure of the system when falling on the surface of the objects. The high-pressure water mist system can control the spreading of smokes, and the water mist may absorb the smoke dusts and conduct the degradation of it on the ground. Since the small water quantity of high-pressure water mist, its influence on EDP components can be ignored.
3. In cable tunnels and cable interlayers
Cable tunnels and cable interlayers are important electric parts and possesses high fire hazard. Due to the narrow space and negative conditions for ventilation as well as heat emission, the sharply raising temperature will cause the burning of cables and short of circuit once a fire is occurred, and greater losses will be exerted. In the past, in consideration of causing short circuit of cables due to the large amount of fire water, it is usually left unprotected. The high-pressure water mist system can reduce the loss of cable tunnels to the least for the small amount of fire water and the excellent cooling performance.
4. In tobacco industry and storehouses with large space
Tobacco storehouses are often those with large spaces. For the tobacco is smoldering, excessive amount of fire water and chemical fire extinguishing agents with peculiar smell will cause the tobacco rotten and deteriorated or rancid. Therefore, neither gas fire extinguishing nor sprinkler or chemical fire extinguishing shall be applied in those places.
High-pressure water mist owns merits of small water consumption, odorless and pollution free. With the assistance of its good diffusion characteristics, it can control the smoldering fire in areas with large space and ensure the fire-extinguishing safety of tobacco and large rooms to the most.
5. Workshops of internal combustion engine, power generating set, hydraulic system and heat treatment workshop
Having great quantity of oil substances, these places owns high fire hazard which can be caused by oil, electricity and high temperature. Once there is a fire, it will spread quite quickly.
It has been proved that high-pressure water mist is quite effective to fire caused by oil and the thermal stress and the machines service life will not be affected due to the surface cooling effect of well-distributed water mist. The system can be designed into prevention system for one certain objective or the entire floor of the building to shorten the time loss caused by the fire to the least.
6. In stations and sections of railways and various tunnels
The application of it on stations, various waiting rooms and railway locomotives of railway tunnels and highway tunnels above the level of class 4 shall solve the problems which can not be solved by the existing fire extinguishing methods completely, bringing excellent security for the entire industry.
7. In military equipments and storerooms
Military equipments, with high value density, own fire hazard integrating electricity, oil and ammunitions together which are explosive and flammable. The fire prevention of equipments for battle and duty, which shall be ready on battle at any time, is of extreme importance. And it is the same with various storerooms of military equipments like missile launchers, armored vehicles and planes. High-pressure water mist technology becomes the best one to solve the problem of fire prevention.
8. In petrochemical industry and various oil tanks
Accidents in petrochemical industry, like the Jilin chemical plant which is burnt for tens of hours, explored, polluted the Songhua River and caused fires in oil tank areas, tells us that small fires or explorations resulted by minor ignorance or mistakes may exert tremendous hazards or secondary hazards. Merits of high-pressure water mist which can control the fire or explosion rapidly provides best technical plan as well as methods for these international problems. It is the only reliable method to control the fire caused by alcohols, gasoline and other oils.
9. In synthesis tower of coal chemical industry
The synthesis tower of coal chemical industry has certain working pressure. Once the fine coal powder is released, there will be jet fires or even explosions. Since the heating value of synthesis gas is high, the heat generated by burning may cause the deformation of steel structure of the synthesis tower, and greater loss will be exerted.
The excellent characteristics of heating absorption and well-distributed surface cooling for high-pressure water mist can keep the heating steel structure non-deforming when the temperature is decreased. And the good dustfall characteristics can conduct degradation for the released coal power to the ground to prevent fire and exploration.
The high-pressure water mist fire extinguishing system is the best choice for the coal chemical industry.
