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9 Cards in this Set
- Front
- Back
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THE DRY POWDER EXTINGUISHER IS DESCRIBED IN THE QFRS AS
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As a portable fire fighting medium which is expelled by internal pressure and is easily identified red cylinder with a white band.
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THE DRY POWDER EXTINGUISHER IS USED IN THE QFRS TO
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Supress the flame of a class ABC fire, this powder melts at a low temperature to form a layer of slag which excludes the gas and heat transfer at the fuel surface.
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THE DRY POWDER EXTINGUISHER IS CONSTRUCTED IN 3 MAJOR COMPONENTS
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Consisting of the cylinder, operating head assembly and the discharge hose and nozzle...
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STARTING WITH THE IDENTIFICATION AND CYLINDER MARKINGS...
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Colour coded area to establish at-a-glance contents recognition signal red white collar...
The cylinder is permanently marked with a specification and operation instruction label including... "DRY POWDER TYPE" Extinguisher classification and rating... Instructions?pittographs... Servicing information... Manufacturers name... Size of the agent... |
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THEN WE HAVE THE CYLINDER...
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Constructed of stainless steel, carbon steel or non ferrous metal may also contain a Polyester external coating adds extra protection to withstand extreme temperatures, dirty environments and UV degradation....
Non-damaging plastic skirt... Neck ring with internal thread... And a hanging bracket for being mounted to a wall... |
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NEXT IS THE OPERATING HEAD ASSEMBLY...
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This opens the primary seal on the cylinder...
Simple seize and squeeze method of operation combined with controllable discharge for maximum fire-fighting performance and minimum mess... Screws into the neck ring... Anti tamper seal which is attached to the safety pin... Gauge indicates cylinder pressure... Syphon tube which extinguishing agent is conveyed to the operating head... Pressure release vents, discharge any residual cylinder pressure which prevents the seperation of the head from the cylinder... |
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LASTLY WE HAVE THE DISCHARGE HOSE AND NOZZLE...
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Flexible hose which controls the direction and projection of the medium
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TO BRING THE DRY POWDER EXTINGUISHER INTO OPERATION IN THE QFRS REQUIRES THE FOLLOWING SKILLS...
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Locate the extinguisher and take it to objective...
Prepare the extinguisher by releasing the hose from the reatining clip, release the safety pin and grasp the hose... Test the operation by sqeezing the lever for a short time... Operate Extinguisher... Sweeping motion above base of fire...???????????? |
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IN ADDITION...
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ABC powder is monoammonium phosphate and/or ammonium sulfate.. For this reason it can also effective against class A fires. ABC powder is usually the best agent for fires involving multiple classes. However it is less effective against three-dimensional class A fires, or those with a complex or porous structure...
The expellant is stored in the same chamber as the firefighting agent itself... |
