WO1996029117A1 - Device for waterfog extinguishing of especially a-fires - Google Patents

Device for waterfog extinguishing of especially a-fires Download PDF

Info

Publication number
WO1996029117A1
WO1996029117A1 PCT/NO1996/000066 NO9600066W WO9629117A1 WO 1996029117 A1 WO1996029117 A1 WO 1996029117A1 NO 9600066 W NO9600066 W NO 9600066W WO 9629117 A1 WO9629117 A1 WO 9629117A1
Authority
WO
WIPO (PCT)
Prior art keywords
waterfog
nozzles
fires
extinguishing
room
Prior art date
Application number
PCT/NO1996/000066
Other languages
French (fr)
Inventor
Søren ØVRETVEIT
Ottar Braut
Original Assignee
Fokus Bank Asa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fokus Bank Asa filed Critical Fokus Bank Asa
Priority to EP96908401A priority Critical patent/EP0820327A1/en
Priority to AU51647/96A priority patent/AU5164796A/en
Publication of WO1996029117A1 publication Critical patent/WO1996029117A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C99/00—Subject matter not provided for in other groups of this subclass
    • A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
    • A62C99/0072—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using sprayed or atomised water

Definitions

  • the invention relates to a device for waterfog fire extinguishing of especially A-fires.
  • the object of the invention is to provide a device for waterfog extinguishing fires.
  • the object is achieved in that a building internally is equipped with nozzles for supplying waterfog both from ceiling and floor, and that the nozzles in the floor of the building are adapted to supply waterfog having a somewhat larger drops than the nozzles in the ceiling of the building.
  • Waterfog extinguishes fires in that the waterfog is converted into steam binding heat and, thus, acts cooling, and in that the steam displaces air and, thus, oxygen from the combustion zone.
  • Waterfog is produced in that water under pressure is conducted through nozzles of a known type.
  • nozzles There exist several types of nozzles for supplying waterfog.
  • In the ceiling fixed nozzles may be used.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)

Abstract

A device for waterfog extinguishing of fires, especially for use in sensitive wooden buildings worth preserving. According to the invention, the room is internally equipped with nozzles for supply of waterfog both from ceiling and floor, the nozzles in the floor, preferably, being adapted to supply waterfog having larger drops than the nozzles in the ceiling of the room.

Description

DEVICE FOR WATERFOG EXTINGUISHING OF ESPECIALLY A-FIRES
The invention relates to a device for waterfog fire extinguishing of especially A-fires.
It has been found efficient to extinguish fires by means of waterfog, and installations for waterfog fire extinguishing replace little by little other known types of fire extinguishing installations as sprinkler and halon system. Waterfog fire extinguishing has been demonstrated in connection with relatively vigorous fires developing a large heat effect, such as hydrocarbon fires.
In waterfog fire extinguishing, relatively small amounts of water are supplied, and waterfog installations have been met with great interest in connection with sensitive wooden buildings such as stave churches and other old houses worth preserving. However, reliable extinguishing of fires of this type, socalled A-fires, has not been demonstrated with success, in spite of many attempts and many concepts of various kinds. High impulse supply of waterfog from a small number of fog nozzles by means of one or more fans has been met with interest, but satisfactory extinguishing results have failed to appear. Little by little, it has been generally accepted that it is possible to dampen and control an A-fire by means of waterfog, but that extinguishing requires other means. The object of the invention is to provide a device for waterfog extinguishing fires.
According to the invention, the object is achieved in that a building internally is equipped with nozzles for supplying waterfog both from ceiling and floor, and that the nozzles in the floor of the building are adapted to supply waterfog having a somewhat larger drops than the nozzles in the ceiling of the building.
Waterfog extinguishes fires in that the waterfog is converted into steam binding heat and, thus, acts cooling, and in that the steam displaces air and, thus, oxygen from the combustion zone. Waterfog is produced in that water under pressure is conducted through nozzles of a known type. There exist several types of nozzles for supplying waterfog. In the ceiling, fixed nozzles may be used. In the floor, for practical reasons, vertically movable nozzles of a known type are used, said nozzles being aligned with the floow surface when they are not in use, and raise from the floor, releasing nozzle openings when the water pressure has been put on in connection with extinguishing.
When waterfog is supplied from above, the room above the flame is gradually filled with water steam displacing air and reducing access of oxygen. With a small fire in a large room, it takes a long time to produce enough steam and, in practice, it has been found that such a fire may most probably be kept down, but it will not be extinguished. Experiments have shown that a small bonfire on a floor will not be notably influenced by fog supplied from above, relatively little steam being produced. When supplying fog from below towards a correspondingly small bonfire, experiments show that this is not sufficient either. Through a combination of fog supplied both from above and from below, the fire can be extinguished.

Claims

C l a i m
A device for waterfog extinguishing of fires in a room wherein the room internally is equipped with nozzles for supplying waterfog both from ceiling and floor, c h a r a c t e r i z e d i n that the nozzles in the floor of the room are adapted to supply waterfog having larger drops than the nozzles in the ceiling of the room, the nozzles in the floor of the room being adapted to supply waterfog in the lower portions of the room volume, the nozzles in the ceiling of the room being adapted to supply waterfog in the higher portions of the room volume.
PCT/NO1996/000066 1995-03-23 1996-03-25 Device for waterfog extinguishing of especially a-fires WO1996029117A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP96908401A EP0820327A1 (en) 1995-03-23 1996-03-25 Device for waterfog extinguishing of especially a-fires
AU51647/96A AU5164796A (en) 1995-03-23 1996-03-25 Device for waterfog extinguishing of especially a-fires

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO951105A NO302604B1 (en) 1995-03-23 1995-03-23 Water mist based fire extinguishing system
NO951105 1995-03-23

Publications (1)

Publication Number Publication Date
WO1996029117A1 true WO1996029117A1 (en) 1996-09-26

Family

ID=19898044

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1996/000066 WO1996029117A1 (en) 1995-03-23 1996-03-25 Device for waterfog extinguishing of especially a-fires

Country Status (4)

Country Link
EP (1) EP0820327A1 (en)
AU (1) AU5164796A (en)
NO (1) NO302604B1 (en)
WO (1) WO1996029117A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684019A (en) * 1971-05-07 1972-08-15 Howard W Emmons Method for fighting a fire
WO1992015370A1 (en) * 1991-02-28 1992-09-17 Sundholm Goeran Spray-head for fighting fire
WO1993000962A1 (en) * 1991-07-12 1993-01-21 Sundholm Goeran Fire-fighting equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684019A (en) * 1971-05-07 1972-08-15 Howard W Emmons Method for fighting a fire
WO1992015370A1 (en) * 1991-02-28 1992-09-17 Sundholm Goeran Spray-head for fighting fire
WO1993000962A1 (en) * 1991-07-12 1993-01-21 Sundholm Goeran Fire-fighting equipment

Also Published As

Publication number Publication date
NO951105L (en) 1996-09-24
AU5164796A (en) 1996-10-08
EP0820327A1 (en) 1998-01-28
NO951105D0 (en) 1995-03-23
NO302604B1 (en) 1998-03-30

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