dry powder fire extinguisher的意思|示意

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Dry powder fire extinguishers are designed to tackle fires involving both flammable solids and liquids, and can even be effective against fires involving gases, under certain conditions. They also have the advantage of blanketing the fire with an extinguishing agent, which can help to prevent re-ignition.

The dry powder extinguisher is the most common type of extinguisher and is usually suitable for tackling most types of common fires, including those commonly seen in domestic, commercial and industrial settings.

It works by rapidly depleting the oxygen content of the atmosphere around the fire, and works by blanketing the flames and cutting off the source of oxygen. The dry powder also creates a barrier between the fuel and oxygen which helps to stop the fire from reigniting.

The dry powder extinguisher should never be used in confined spaces without adequate ventilation as the powder can create a choking hazard, and the user should ensure that they are wearing suitable respiratory protection or a dust mask.

When using the extinguisher, it is important to keep the nozzle at least 1.5 metres away from the fire and to aim the jet of powder at the base of the flames, as this will be most effective. A single large jet of powder should be used, rather than a series of small jets, and it is advisable to use a sweeping motion if possible, as this will help to evenly distribute the powder and reduce the risk of the fire reigniting.

If you think that a dry powder extinguisher is suitable for tackling the fire, then it is important to ensure that it is operating correctly. To do this, check that the pin is in place and the pressure gauge is in the green area. If you find it is not in the green area, then the extinguisher needs to be recharged and should not be used in the event of a fire.