Electrical safety &ppes

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The expected hazardfs involved in mechanical works

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Injury to workers during handling of materials.  Hands or legs caught underneath loads.Burns ,electric shock during welding works and other hot works ,short cir cute & fire incide4nts. Collapse of cranes & other lifting equipments. Failiear of lifting tools & tackles. Eye injury due to falling particles during grinding,grit blasting & power brushing. Suffocation due to excessive smoke or dust during welding & blasting operations. Swinging of load and hitting on existing facilities during rigging operation in strong wind. Welders trapped underneath pipes during welding works -as support are moved. Back fire and explosion of compressed gasses during oxy -acetylene flame cutting. Hazards due to smoking in prohibited areas. Hazards due to bursting of pipe lines during hydro testing at high pressure range.
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Local Exhaust Ventilation

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This system of ventilation is provided at or near the point of  generation of contaminants  in the work area .Where as the mechanical ventilation only partly removes the contaminants  from the working atmosphere ,while the local exhaust  system achieves complete exhaust of contaminants from the work area .This system is cheap when compared to mechanical ventilation.Since the filtering units required occupies only a small area of point of generation of contaminants
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Extinguishing media (FORM)

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Liquids having a specific gravity lower than that of water are much difficult for extinguishing with the use of water. When water is put to the burning surface of a liquid, it lower the temperature momentarily and then sinks below the surface of the liquid. Form is relatively insoluble in most liquids and because of its light weight , floats on the surface of the liquids. It forms a blankets capable of covering the surface of the burning liquid & so extinguish  the fire .It also forms a radiant heat barrier , which is of importance in extinguishing oil and petrol fires.
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