EP1064055A1 - Fire extinguishant - Google Patents
Fire extinguishantInfo
- Publication number
- EP1064055A1 EP1064055A1 EP99954124A EP99954124A EP1064055A1 EP 1064055 A1 EP1064055 A1 EP 1064055A1 EP 99954124 A EP99954124 A EP 99954124A EP 99954124 A EP99954124 A EP 99954124A EP 1064055 A1 EP1064055 A1 EP 1064055A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- acid salt
- potassium
- proportion
- fire
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/0071—Foams
- A62D1/0085—Foams containing perfluoroalkyl-terminated surfactant
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/0071—Foams
Definitions
- the present invention relates to a fire extinguishant solution-
- a modified aqueous fire fighting foam comprising a modified aqueous fire fighting foam and a salt selected from a group
- hydrocarbon surfactant such as sodium octyl sulphate.
- a salt selected from a group containing potassium lactate, a glycollic acid salt, a lactic
- a fluorosurfactant in a proportion from 0.02 weight % to 1 weight %, a hydrocarbon
- a foam booster such as
- diethylene glycol monobutyl ether in a proportion from 0.1 weight % to 2.0 weight %
- hydrocarbon surfactant typically an
- anionic surfactant provides a highly effective fire extinguishant when combined with a
- the resulting water-based compound has a
- the fire extinguishant has an approximately neutral
- PH is non-toxic, and it improves on powder base extinguishants in that it is easier to
- potassium lactate is the preferred salt, salts of glycollic acid, lactic acid,
- hydroxybutyric acid and tartaric acid may be used. Also potassium glycollate, potassium
- hydroxybutyrate or potassium tartrate salts may be used.
- the preferred composition is 5 weight % to 60 weight % (most preferably 45 weight %
- potassium lactate 0.02 weight % to 1 weight % (most preferably 0.08
- hydrocarbon surfactant 0.5 weight % (most preferably 0.2 weight % to 0.3 weight %) hydrocarbon surfactant
- foam booster (Diethylene glycol monobutyl ether [butyl carbiton/butyl
- the foam booster is optional but its inclusion improves the performance of the foam booster
- the preferred extinguishant may be used for fixed systems and portable appliances.
- Potassium lactate is non-toxic and generally harmless.
- the water droplets absorb heat as they boil and
- the addition of the modified AFFF reduces the surface tension of the water to below 20mN/m, and the water forms smaller droplets. The greater
- Potassium lactate absorbs more energy as it breaks down than potassium bicarbonate
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing Compositions (AREA)
Abstract
A fire extinguishant solution comprising a modified aqueous fire fighting foam and a salt selected from a group containing potassium lactate, a glycollic acid salt, a lactic acid salt, a hydroxybutyric acid salt, a tartaric acid salt, potassium glycollate, potassium hydroxybutyrate and potassium tartrate, wherein the aqueous fire fighting foam is modified by the removal of an anionic hydrocarbon surfactant such as sodium octyl sulphate.
Description
FIRE EXTINGUISHANT
The present invention relates to a fire extinguishant solution-
According to the present invention there is provided a fire extinguishant solution
comprising a modified aqueous fire fighting foam and a salt selected from a group
containing potassium lactate, a glycollic acid salt, a lactic acid salt, a hydroxybutyric acid
salt, a tartaric acid salt, potassium glycollate, potassium hydroxybutyrate and potassium
tartrate, wherein the aqueous fire fighting foam is modified by the exclusion of an anionic
hydrocarbon surfactant such as sodium octyl sulphate.
According to the invention, there is also provided a fire extinguishant solution consisting
of a salt selected from a group containing potassium lactate, a glycollic acid salt, a lactic
acid salt, a hydroxybutyric acid salt, a tartaric acid salt, potassium glycollate, potassium
hydroxybutyrate and potassium tartrate in a proportion from 5 weight % to 60 weight %,
a fluorosurfactant in a proportion from 0.02 weight % to 1 weight %, a hydrocarbon
surfactant in a proportion from 0.05 weight % to 0.5 weight %, a foam booster such as
diethylene glycol monobutyl ether in a proportion from 0.1 weight % to 2.0 weight %
and a trace of biocide, the remainder being water.
Fire extinguishant solutions in accordance with the invention will now be described by
way of example.
It is desirable to combine the benefits of foam extinguishants with the fast fire knock¬
down effect of fire extinguishing powders. However, an extinguishant combining a salt
such as potassium lactate or citrate with a fluorosurfactant has been found to be unstable
and unsatisfactory.
An alternative approach is to combine an aqueous foam fire fighting compound (AFFF)
with a salt such a potassium lactate. This is also unsatisfactory since the resulting solution
is unclear and unstable and has an increased viscosity.
It has been found, however, in accordance with the invention that an AFFF which has
been modified by the removal or alteration of a hydrocarbon surfactant (typically an
anionic surfactant) provides a highly effective fire extinguishant when combined with a
salt such as potassium lactate. Furthermore, the resulting water-based compound has a
low freeze temperature (being usable at temperatures less than -40° C) and provides a
cost-effective method of producing small particles of extinguishant within a fire for more
effective fire-fighting. Furthermore, the fire extinguishant has an approximately neutral
PH, is non-toxic, and it improves on powder base extinguishants in that it is easier to
distribute through pipework without clogging and is easier to clean up after discharge.
It also provides a more effective fire extinguishant than water or a foam/water mix.
Although potassium lactate is the preferred salt, salts of glycollic acid, lactic acid,
hydroxybutyric acid and tartaric acid may be used. Also potassium glycollate, potassium
hydroxybutyrate or potassium tartrate salts may be used.
The preferred composition is 5 weight % to 60 weight % (most preferably 45 weight %
to 55 weight %) potassium lactate, 0.02 weight % to 1 weight % (most preferably 0.08
weight % to 1.0 weight % fluorosurfactant (Atochem Forarfac 1157N), 0.05 weight % to
0.5 weight % (most preferably 0.2 weight % to 0.3 weight %) hydrocarbon surfactant
(Henkel APG 325N), 0.1 weight % to 2.0 weight % (most preferably 0.4 weight % to 0.6
weight %) foam booster (Diethylene glycol monobutyl ether [butyl carbiton/butyl
diglycol]) and a trace of biocide (Nippon Bactrachem W15), the remainder being water.
The foam booster is optional but its inclusion improves the performance of the
extinguishant.
Comparative tests have been conducted on a lm3 test rig with all sides covered apart from
the front. An obstruction in the form of a car engine was placed in the centre of the rig
and the extinguishant agents were discharged via horizontal jets or overhead sprays. Five
litres of diesel with 1 litre of petrol floating on a water base was used as the fuel. The fire
was allowed to burn for 30 seconds to allow for full fire involvement of the diesel before
extinguishant actuation.
The following results were obtained:
Tests have also been conducted to compare the effect of the preferred composition and
AFFF on polar-solvent fires.
Tests were conducted on a fire tray as described in MoD Defence standard 42-41 /Issue
1, 0.25m2 fire tray. Comparative tests were conducted with a 3 ltr. portable fire
extinguisher filled with AFFF and the preferred composition respectively.
These tests show that the preferred composition has a better performance than AFFF
premix, FM200 and FE36. The performance approaches that of Halon 1211.
The preferred extinguishant may be used for fixed systems and portable appliances.
Potassium lactate is non-toxic and generally harmless.
In operation, the various components of the extinguishant contribute to the extinguishing
action. Thus, the water cools the flammable liquid to below its ignition temperature and
the fire goes out. The limiting factor is the droplet size; hence the success of mist and fog
systems as compared to jets of water. The smaller the droplet size the greater the surface
area, and the more effective the spray. The water droplets absorb heat as they boil and
turn to water vapour. This water vapour also takes up significantly more volume, thus
diluting the local oxygen level. The addition of the modified AFFF reduces the surface
tension of the water to below 20mN/m, and the water forms smaller droplets. The greater
surface area of the smaller droplets increases the speed of operation of the extinguishant.
Finally, the potassium lactate is broken down by the fire. Heat is absorbed as the
compound breaks down and potassium ions are liberated which break the 'fire chain'.
Potassium lactate absorbs more energy as it breaks down than potassium bicarbonate
which has been used as an extinguishant. The solution droplets entering the combustion
zone and impinging on the hot surfaces will release the potassium lactate from the
solution.
Claims
1. A fire extinguishant solution comprising a modified aqueous fire fighting foam and
a salt selected from a group containing potassium lactate, a glycollic acid salt, a lactic
acid salt, a hydroxybutyric acid salt, a tartaric acid salt, potassium glycollate, potassium
hydroxybutyrate and potassium tartrate, wherein the aqueous fire fighting foam is
modified by the exclusion of an anionic hydrocarbon surfactant such as sodium octyl
sulphate.
2. A fire extinguishant solution according to claim 1, wherein the salt is present in
a proportion of from 5 weight % to 60 weight %.
3. A fire extinguishant solution according to claim 1 or claim 2, wherein the aqueous
fire fighting foam includes a fluorosurfactant present in a proportion of from 0.02 weight
% to 1 weight %.
4. A fire extinguishant solution according to any preceding claim, wherein the
aqueous fire fighting foam includes a hydrocarbon surfactant present in a proportion from
0.05 weight % to 0.5 weight %.
5. A fire extinguishant solution according to any preceding claim, wherein the
aqueous fire fighting foam includes a foam booster present in a proportion from 0.1 weight % to 2.0 weight %.
6. A fire extinguishant solution consisting of a salt selected from a group containing
potassium lactate, a glycollic acid salt, a lactic acid salt, a hydroxy butyric acid salt, a
tartaric acid salt, potassium glycollate, potassium hydroxybutyrate and potassium tartrate
in a proportion from 5 weight % to 60 weight %, a fluorosurfactant in a proportion from
0.02 weight % to 1 weight %, a hydrocarbon surfactant in a proportion from 0.05 weight
% to 0.5 weight %, a foam booster such as diethylene glycol monobutyl ether in a
proportion from 0.1 weight % to 2.0 weight % and a trace of biocide, the remainder being
water.
A fire extinguishant solution including a modified AFFF as described herein.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9900637 | 1999-01-12 | ||
GB9900637A GB2345849B (en) | 1999-01-12 | 1999-01-12 | Fire extinguishant |
PCT/GB1999/003620 WO2000041770A1 (en) | 1999-01-12 | 1999-11-02 | Fire extinguishant |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1064055A1 true EP1064055A1 (en) | 2001-01-03 |
Family
ID=10845880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99954124A Withdrawn EP1064055A1 (en) | 1999-01-12 | 1999-11-02 | Fire extinguishant |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1064055A1 (en) |
AU (1) | AU1056300A (en) |
GB (1) | GB2345849B (en) |
WO (1) | WO2000041770A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100469404C (en) * | 2003-12-26 | 2009-03-18 | 中国科学技术大学 | Additive for water-mist fire suppression system |
CN1915461B (en) * | 2006-09-07 | 2010-08-18 | 广州市花都区花东南方林业扑火工具厂 | Extinguishing agent and manufacturing method |
CN102083500A (en) | 2008-05-30 | 2011-06-01 | 基迪-芬沃尔公司 | Fire extinguishing composition |
CN107469268B (en) * | 2017-10-10 | 2021-05-18 | 广东国信融资租赁有限公司 | Water-based fire extinguishing agent |
GB2575988B (en) * | 2018-07-30 | 2020-07-22 | Kingspan Holdings Irl Ltd | Phenolic foam and method of manufacture thereof |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE634505A (en) * | 1962-08-03 | |||
JPS4914197B1 (en) * | 1970-12-31 | 1974-04-05 | ||
DD106123A3 (en) * | 1972-04-19 | 1974-06-12 | ||
GB1596045A (en) * | 1977-04-20 | 1981-08-19 | Dunlop Ltd | Fire extinguishants |
AU520410B2 (en) * | 1977-06-21 | 1982-01-28 | National Foam System, Inc. | Fighting fire |
JPS55184A (en) * | 1979-04-09 | 1980-01-05 | Fukada Kogyo Kk | Bubble quenching agent |
DE3037155A1 (en) * | 1980-10-01 | 1982-05-06 | Hoechst Ag, 6000 Frankfurt | FOAM DELETE CONCENTRATE AND ITS USE |
US4756839A (en) * | 1986-03-26 | 1988-07-12 | Curzon Jon L | Fire extinguishing composition |
DE4108341A1 (en) * | 1991-03-14 | 1992-09-17 | Guenther Rottmann Gmbh | Water-based fire extinguisher compsns. for class A fires e.g. wood, textiles, etc. - contg. potassium hydrogen tartrate, potassium carbonate and surfactant |
DE4120993A1 (en) * | 1991-03-14 | 1992-12-10 | Guenther Rottmann Gmbh | Fire extinguisher solns. for class=A fires - contg. potassium hydrogen tartrate and di:potassium tartrate, (bi)carbonate or (di)hydrogen phosphate, surfactant, preservative and antioxidant |
US5391721A (en) * | 1993-02-04 | 1995-02-21 | Wormald U.S., Inc. | Aqueous film forming foam concentrates for hydrophilic combustible liquids and method for modifying viscosity of same |
JPH07171228A (en) * | 1993-12-17 | 1995-07-11 | Yamato Protec Co | Method for fire fighting |
GB2331457B (en) * | 1997-11-12 | 2001-07-04 | Graviner Ltd Kidde | Fire or explosion suppressants and methods |
-
1999
- 1999-01-12 GB GB9900637A patent/GB2345849B/en not_active Expired - Fee Related
- 1999-11-02 EP EP99954124A patent/EP1064055A1/en not_active Withdrawn
- 1999-11-02 AU AU10563/00A patent/AU1056300A/en not_active Abandoned
- 1999-11-02 WO PCT/GB1999/003620 patent/WO2000041770A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0041770A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000041770A1 (en) | 2000-07-20 |
AU1056300A (en) | 2000-08-01 |
GB2345849B (en) | 2003-02-12 |
GB2345849A (en) | 2000-07-26 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20001010 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE DK ES FR |
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17Q | First examination report despatched |
Effective date: 20020110 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20020723 |