Description
Stored Pressure, (AFFF) foam, Fire Extinguisher with mounting bracket Aqueous foam extinguishers are effective both in smothering flames AND in reducing the heat from combustion. This is because the foam is mostly water and, of the common extinguishing agents, water is most effective at removing heat. The problem in using water alone, is that it will 'float' and spread fire in light liquids, such as paraffins (from Octane, right up to waxes) and petroleum and aromatic fuel spirits. Applying water as a foam achieves several benefits: there is little run off, lower surface tension of the foam more readily applies water to the heat source, the foam smothers flame, depriving it of a ready source of oxygen and, as the water boils away to steam, in the fire, every gramme removes more tha n 130 calories of heat energy - weight for weight; this is more than 100 times what carbon dioxide is able to remove and better than fifty times what intumescing powder exinguishers can remove. This size of extinguisher offers useful effect in dealing with bigger fires but weight is a consideration and soem situations might be better met by using two, 6 litre extinguishers. The extra weight, about 3.5 Kg, of a 9 litre extinguisher significantly reduces one's ability to run with it, to manipulate it and thus to react properly, in due time; so; for offices, medical rooms and laboratories, especially those occupied by women, the 6 litre size in generally the most useful - remembering that all portable extinguishers compromise fire-fighting capacity against weight and manoeverability. Notes on selection: Powder is more tenacious, though, remaining at the fire seat for longer than foam - although powder removes less heat. Powder extinshing media do not conduct electricty, either but foam and water will, once a surface is thoroughly dampened. Usually, foam extinguishers are the 'best all-rounders' and powder extinguishers can be subject to clogging and so failing, should there be even the tiniest amount of moisture inside the cylinder.This means that the powder extinguisher's gas propellant must contain less than 25 milligrammes of moisture, per cubic metre; whereas compressed air from industrial compressors usually contains about ten thousand times this amount! Foam extinguishers are easily serviced and refilled, after discharge and have high, operational reliability. Foam Fire extinguishers leave no mess and, used on engine fires, will not inherently cause damage to bearing component surfaces A 9 Litre, foam extinguisher is best suited for combating risk from factory and warehouse fires, in material including rubber, plastics, wood, paper or flammable liquid fires. Directed at the base of the fire, Foam extinguishers have good 'knock-down' characteristics (though not quite so good as Dry-powder) and have the great advantage of absorbing similarly large amounts of heat from the fire, as does water. Suitable for: flammable liquid fires: machine and vehicle fires, factories and laboratories, situated at marked Fire Points. Types of fire: include Classes A, B (solids, flammable liquids) and fires involving live electrical equipment at less than 50 Volts PD. Technical Specification 5-Year Warranty Easily serviced, on -site Optimum spray nozzle & valve assembly BS EN3 approved, BAFE approved, CE Marked, BSi Kitemarked Fire rating 21A/233B Supplied filled and ready for use and wall bracket included Approximate dimensions: Height 600 x 190 dia. mm; weight 14 Kg Discharge time 40 seconds Operating temperature 0 to 60°C Notes: Fire precautions and Fire fighting equipment must be accompanied by regular training and its selection and use based on your Fire Risk Assessment.We offer a Fire Risk Assessment Service and full, first aid Fire-fighting training, at our Telford training centre.Information is available from our down loads section, including a proforma for risk assessment and a guide on the selection and use of portable extinguishers.