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When firing the fireworks there are various factors that are a potential danger to others. Knowledge of these factors can significantly improve the safety of users and others in the event of conditions not covered in the instructions. The main hazards are:
A. Flame or high temperature combustion product
This factor is typical for the fountains, fireworks moving through the jet thrust rocket, sun, etc. The danger lies in the possibility of ignition of flammable substances, which are close to the fireworks.
Discounted items products (tablets fireworks, sparks, slag)
This danger arises when the work of Roman candles, fireworks and other products, the effect of which is achieved by spreading at the height of the burning brightly colored stars. Burning time is chosen by designers so that they could burn up before reaching the earth`s surface. So if, for example, place the Roman candle fireworks or not upright, but at an angle, then burning may fall to the ground.
When triggering, high-altitude fireworks sometimes occurs zvezdok fall burning. Usually this is a consequence of design flaws or mortar, or change the properties of pyrotechnic compositions with prolonged or improper storage of products.
In low-quality candles Bengal sometimes fall off red-hot slag. At home, it is extremely dangerous. Therefore it is better to try once in a safe environment candle, as you are not sure.
Nevertheless, there are special types of fireworks that throw sparks and burning zvezdki at the surface in all directions. These fireworks are allowed to use only water and spectacle they create, extremely impressive.
Moving from the initial velocity of ejection, or under the influence of reactive force the product or its components
The danger is traumatizing spectators or material damage in a collision with a product or its components.
To ensure the safety of fireworks, rockets, balloons, etc. is vertically upwards away from the various facilities. The design of fireworks should not have sharp edges and edges, or should be provided with protective caps or lugs.
Corps of fireworks from small firecrackers to the largest ball made of paper, paperboard or use lightweight or easily breakable plastic parts. Such details are quickly losing speed, and even falling from a great height, can cause damage.
For large-scale missile threat is a separate drop-wooden slats of the stabilizer. These missiles may be used only away from the audience.
The composition of the combustion products
Pyrotechnic compositions are multicomponent mixtures, which may form during combustion are harmful to health at a high concentration of the substance. In this regard, the majority of fireworks are allowed for use only outdoors.
Five. Sound pressure
A very large volume of fireworks at rupture can cause many viewers a sense of discomfort or injury to the hearing aid. With increasing distance the volume decreases rapidly. Beyond the boundaries of the danger zone volume should not exceed the permissible norms of 140 decibels.
Limitations on the volume relevant to firecrackers and other explosive charges. In the immediate vicinity of the large-caliber mortar sound pressure can injure unprotected eardrums.
These factors are the primary in determining the boundaries for each firework danger zone, ie areas where you may receive an injury or material damage. Size of the zone specified in the instruction manual or technical documentation.
For all the potential dangers fireworks are divided into classes V. In a free market people are allowed no more than fireworks only Class III hazards. The radius of the danger zone is:
Class I - no more than 0.5 meters: this is mainly for indoor fireworks - firecrackers, sparklers candles, tabletop fountains
Class II - no more than 5 feet: Most fountains, firecrackers , fireworks ground
Class III - less than 20 meters: fireworks, rockets, festival balls
For Class IV includes articles in which the radius of the danger zone for at least one of these hazards is more than 20 meters - a professional fireworks, the treatment of which requires special training.
For Class V includes all the remaining fireworks, hazards and hazardous areas are defined by special arrangement.