General exchange extraction of the lower zone of craters
Warehouses that store bulk materials in the label (and drums and similar containers, dust is much less. If the bulk material is not poisonous, there might restrict natural ventilation. But in this case by all the same desirable mechanical ventilation. If the toxic materials (lead , manganese, cadmium compounds, etc.) then you must pomoschyo recovery facilities with artificial ventilation. In addition, special attention should be paid to cleaning, especially floors. Manual cleaning is totally unacceptable. If you have dry cleaning should use an industrial vacuum cleaner or provide a neutral stationary pylesosnuyu installation.
Ventilation warehouse is solved according to the method of its loading and unloading. The most reasonable supply of bags or drums on pallets by forklifts with forks. In this case, transfer of dissolved and the shaking of bags, but in this type of dust in a warehouse still available.
When a carrier bag and hand them stacking arises dust emission in the field handler. If such places are fixed, then they are arranged near the zone pumps in the form of craters and crevices. When the place of transshipments are not fixed, dusting occurs almost throughout the warehouse. Zone of greatest concentration of dust is mostly lower on the perimeter of the warehouse. In this case only general exchange inefficient extraction of the lower zone of craters, are located at the walls at a height of 300 mm from the floor.
The amount of air removed one funnel, take 300-500 m3 / h, funnels are located between the stacks of bags or drums.
Multiplicity of exchange on the premises of warehouses that store bulk materials in containers that are made from 4 to 10 per hour, depending on the toxicity of the released dust.
In heated warehouses stretching should be compensated by the influx of the same people obeme.Esli stay indoors stock short, perhaps limited to devices of special air-conditioned cabins, places of recreation. At short-term stay working in a dusty atmosphere should use a respirator such as "petal" of fabric FPP-15.
The chemical industry is often used bridge cranes. Crane cab usually has an open aperture is required to monitor the movable goods. Crane, located in the upper zone of the premises, often in adverse conditions, being exposed to high temperatures, toxic gases, and sometimes - aerosols and dust. In the chemical industry as in any particular need to protect the crane from harmful influences. Personal protection is not applicable, since the crane operator is in the unhealthy zone the entire working day.
The only way to ensure a normal air environment for the crane is to feed into the cockpit of processed fresh air. Air is supplied to the cabin in an amount that provides a speed its exit through the open doorway as excluding the ingress into the cockpit harmful gay. Depending on the size or the cab windows, speed, crane and the degree of contamination of the shop air supply volume is taken into the cabin air in the range from 500 to 2000 ml1ch. Only in exceptional cases, the amount of air taken more than 2000 m3 / h. Air is supplied to the cabin predominantly upper side opposite the working window, or on the perimeter of the cabin.
Need to stipulate that in the chemical industry taps open cabs are not applicable.