Hand extinguishers

Asbestos suits, axes, ladders, hand extinguishers, hoses, wrenches, and nozzles on hand Fire-fighting proceduies planned Foam chemicals on hand Fire brigade organized... 

For ease in handling, fully charged hand extinguishers should not weigh more than 55 lb (25 kg). All hand extinguishers should be furnished with the manufacturer s standard wall hook or bracket for mounting. If the extinguisher is to be mounted on a vehicle, it should be purchased with a bracket suitable for this purpose. 

There is a wide range of firefighting equipment - from the simple hand extinguisher to sophisticated fire-engine type vehicles. Also, a distinction can be drawn between mobile and fixed apparatus. 

Depending upon the classes of anticipated workplace fires, employers must provide and distribute fire extinguishers according to the requirements outlined above. If on the other hand, extinguishers are provided but are not intended for employee use and the employer has an emergency action plan and a fire prevention plan that meet the requirements of 1910.38 and 1910.39 respectively, then only the requirements of paragraphs (e) and (f) of 1910.157 apply, and fire extinguishers do not need to be made available. 

As the moving contact moves away, so the arc plasma elongates, losing its initial intensity, and as it approaches the current zero, it loses the most of it. The gas, on the other hand, cools and regains its lost mass, while its pressure in the chamber continues to build to its optimum level, making it more capable of extinguishing a less severe arc plasma. The interrupter can thus be adjusted to blow out the arc at the first current zero, while clearing heavy to very heavy fault currents. 

A minor incident is one eapable of being dealt with fairly effeetively and quiekly by personnel on the spot using the emergeney equipment, e.g. fire extinguishers and monitors, on hand. The situation ean be dealt with by the workforee, possibly ineluding a Works Fire Brigade, fairly rapidly. It is reasonably loealized and no other unit is affeeted. 

On a number of occasions people have received a mild electric shock while using a carbon dioxide fire extinguisher. The gas jets from the extinguishers contain small particles of solid carbon dioxide, so a charge will collect on the horn of the extinguisher and may pass to earth via the hand of the person who is holding the horn. 

Define areas and buildings to use wet and dry sprinkler systems, foam systems, location of hand and hose fire extinguishers, fire carts, fire engines. 

Staff who may require to use the extinguishers must be trained both in selecting the appropriate extinguisher and in handling it properly. There is no substitute for actual hands-on use of extinguishers, and fire brigades are usually very pleased to help. 

Vardanyan [65,66] discovered the phenomenon of CL in the reaction of peroxyl radicals with the aminyl radical. In the process of liquid-phase oxidation, CL results from the disproportionation reactions of primary and secondary peroxyl radicals, giving rise to trip-let-excited carbonyl compounds (see Chapter 2). The addition of an inhibitor reduces the concentration of peroxyl radicals and, hence, the rate of R02 disproportionation and the intensity of CL. As the inhibitor is consumed in the oxidized hydrocarbon the initial level of CL is recovered. On the other hand, the addition of primary and secondary aromatic amines to chlorobenzene containing some amounts of alcohols, esters, ethers, or water enhances the CL by 1.5 to 7 times [66]. This effect is probably due to the reaction of peroxyl radicals with the aminyl radical, since the addition of phenol to the reaction mixture under these conditions must extinguish CL. Indeed, the fast exchange reaction... 

An optical flame sensor installed at the beginning of the pipeline is the most suitable device for such an isolation system, since the propagating flame from the explosion has to be detected and extinguished. Pressure detectors alone are, in principle, not suited to the case on hand because there is no distinct separation between the pressure and flame fronts for explosion in pipelines. Optical ir sensors that have a relatively low sensitivity to daylight are normally chosen and have proved themselves amply in industrial practice. Therefore, daylight into the pipe in the vicinity of the sensor must be avoided. It is necessary to flush the optical lens with gas (e.g., nitrogen, air) to keep it dust-free. 

FoS had obvious antioxidant effect. In cell-free system after the addition of hydrogen peroxide solution the extinguishing of fluorescence of 2 ,7 -dichlorofluo-rescein was evident with H202 concentrations at 97 and 194pM. At the substantially higher concentration of the latter (970 pM) a slight nonsignificant overlap of control level was evident (Fig. 7.2). These data confirm the antioxidant activity of pristine C60. On the other hand, they indicate that it is limited to a certain antioxidant capacity (Fig. 7.2). 

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