Sentences with phrase «of halons»

Firefighters have called on the world's users of halons not to destroy the ozone - depleting chemicals — or worse, release them into the air — as old fire - extinguishing systems are junked.

However, the company's technical service manager Jan Haeck, told the seminar that none of the agents under trial could match the performance of halons.

The phaseout of halons has led to a scramble by government and industry researchers to find environmentally suitable replacements.

But last month, the European Commission announced that it will allow companies to import 2000 tonnes of halons, with an ozone - destroying potential equal to 20 000 tonnes of CFCs.

None have been identified with all the positive qualities of halon 1211 and halon 1301.

The impending end of halon production is forcing the fire protection industry to consider recycling the halons already in use.

Not exact matches

Methyl bromide, used in agriculture, and halons, which are used to fight fires, are the principal humanmade sources of the chemical, and their use helped double the amount of bromine in the atmosphere from the mid to the late 20th century.

The company has trained workers to use water to fight electrical switchgear fires if halon is not available, the report said, raising the risk of flooding in adjacent rooms with electrical controls because flood doors have not been established.

The Montreal Protocol and associated agreements have led to decreases in the atmospheric abundance of gases, such as CFCs (chlorofluorocarbons) and halons, once used in products such as refrigerators, spray cans, insulation foam and fire suppression.

Bromotrifluoromethane (CF3Br, or halon 1301) is a close cousin to halon 1211, but has a much lower boiling point and toxic level — properties that have made halon 1301 the firefighting chemical of choice for applications where sprinklers can not be used.

The trick is that the bromine and chlorine atoms in the halon molecule — the very ones that are so damaging to the stratospheric ozone — are also incredibly aggressive scavengers of hydrogen atoms, which are key to maintaining a combustion chain reaction.

Manufacturers have introduced new families of chemicals containing no chlorine or bromine, called hydrofluorocarbons (HFCs), that have physical properties similar to the halons and no ozone depletion potential.

The countries that have signed the Montreal Protocol have agreed to ban some of the most destructive chemicals, including CFCs and halons, much earlier than originally planned.

Its Technology and Economic Assessment Panel, which will be the final arbiter, has already refused to allow any exceptions to the ban on halons despite pleas to be allowed to use them in certain types of fire extinguishers used on planes and trains.

France, Britain and Belgium all argued that they should be allowed to continue to make some halons, claiming they are needed for the new generation of trains designed to run through the Channel Tunnel.

These properties made halons an ideal choice for protecting computers, archives and works of art.

The Dutch government has helped set up a national halons «bank» to ensure the most effective use of the chemicals; Britain is considering following suit, Ann Godfrey, a senior official at the Department of the Environment confirmed last week.

Some industrialised countries have built up large stockpiles of recycled halons, as none has manufactured the chemicals since 1994.

«It would be a tragedy for the world to gather up and destroy all the halons and then have to come back a couple of years later and restart production to supply airlines and the military,» says Taylor.

NASA's space shuttle fleet and its launch facilities are protected by 40 000 pieces of firefighting equipment containing halon - 1301.

But he urges continued monitoring of other harmful and long - lived compounds still in use, including halons with bromine that are present in fire extinguishers.

EU ODS Regulations * No change to halon critical use list but EC chaired regulatory committee given authority to change the list and / or set time limits * DG Environment proposal contains the following end dates for aviation critical uses o Cargo compartment fixed systems — can not be installed on new aircraft after 2015, end of critical use exemption is 2030 o Cabin / crew compartment portables — 2010, 2015 o Engine nacelles and APU — 2010, 2030 o Lavatory (potty bottles)-- 2008, 2015 o Dry bays — 2010, 2030; Inert fuel tanks — 2008, 2030

Summary for Policymakers Technical Summary Chapter 1 Ozone and Climate Chapter 2 Chemical and Radiative Effects of HFCs, PFCs, and Their Possible Replacements Chapter 3 Methodologies Chapter 4 Refrigeration Chapter 5 Residential and Commercial Air Conditioning and Heating Chapter 6 Mobile Air Conditioning Chapter 7 Foams Chapter 8 Medical Aerosols Chapter 9 Fire Protection Chapter 10 Non-medical Aerosols, Solvents and HFC - 23 Chapter 11 Current and Future Supply, Demand and Emissions of HFCs and PFCs, plus Emissions of CFCs, Halons

Replacements for HCFCs, methyl bromide, and halons are still being sought, and studies of the new compounds must continue.

Other classes of GHGs are included in the Montreal Protocol for Substances that Deplete the Ozone Layer and its subsequent amendments and are the chlorofluorocarbons (CFCs), halons, and chlorine - and bromine - containing (halogenated) solvents (methyl chloroform (CH3CCl3), carbon tetrachloride (CCl4), bromochloromethane (CH2BrCl), etc.).

The stratospheric ozone layer has become substantially depleted throughout much of the globe since the 1980s because of enhanced human production and use of ozone - depleting chemicals, such as chlorofluorocarbons, halons, and others, during the 20th century.