Ventilation electrical equipment

Generally, it is more economical to prevent explosive atmospheres ia rooms than to try to provide explosion-proof electrical equipment. Personnel should never be allowed to work ia a ha2ardous atmosphere. Where such an atmosphere cannot be avoided through control of flammable Hquids, gases, and dusts, access to the area iavolved should be limited and the area segregated by hoods or special ventilation. Electrical equipment on open, outdoor stmctures more than 8 m above-ground usually is considered free from exposure to more than temporary, local explosive mixtures near leaks (86). 

Appurtenance 9- p9rt-n9n(t)s, - par-t n-an (t)s (14c) n. Any built-in, nonstructural portion of a building, such as doors, windows, ventilators, electrical equipment, partitions, etc. 

As part of a Process Hazards Analysis (PHA). I was required to check a naturally ventilated building containing electrical equipment and a fuel gas supply, for adequate air flow due to thermal forces (stack effect). API RP 500 has a method that they recommend for buildings of l,000fP or less. The building in question was much larger, because ... 

Equipment inside the building also often influences the ventilation parameters. For example, some electrical equipment needs especially precise indoor conditions. The requirements of these parameters can be one decade stricter than the target levels for people working inside the building. 

The only significant electrical cost involved in ventilation systems is operation of fans. Other electrical equipment such as dampers, compressors, etc. generally mn for such short periods that costs are negligible. 

Laboratories working frequently with flammables, such as in extraction processes, may set aside a separate room for such work for maximum safety. Ideally, this room should have explosion-proof electrical equipment and special ventilation. Rigid work rules should be enforced, such as requiring workers to leave matches and lighters on a shelf outside before entering. Installation of conductive flooring should be considered, and steel tools should be prohibited at times when work is in progress. 

You will need to ensure that all plant and equpment (eg lift trucks, vehicles, gas appliances, machinery guarding, ladders, electrical equipment, lifting equipment, air receivers, ventilation plant) that requires maintenance (eg pre-shift checks, servicing, thorough examinations) is identified and that the maintenance is done. 

Closed system, ventilation, explosion-proof electrical equipment and lighting. 

Ozone (O3) is a powerful oxidizing agent. It is found naturally in the atmosphere by the action of electrical storms. The major indoor source of ozone is from electrical equipment and electrostatic air cleaners. The indoor ozone concentration is determined by ventilation. It depends on the room volume, the number of air changes in the room, room temperature, materials, and the nature of surfaces in the room. Ozone is irritating to the eyes and all mucous membranes. Pulmonary edema may occur after exposure has ceased [32,33]. 

Consequently, substantial concentrations of ozone can accumulate around electrical equipment and photocopying machines. Rooms containing these must be well ventilated, since ozone is toxic and can cause headaches and irritation of the mucous membranes, even in low concentrations. It has been suggested that ozone may be the cause of the excess death rate from leukemia (blood cancer) in electrical workers. Ozone is also extremely damaging to plant life, much more so than acid rain (Sections 8.4 and 8.5). It also attacks rubber and may cause rubber insulation on electrical equipment to perish rapidly. 

Igniter powders should be screened in a well-ventilated area equipped with an expl proof suction fan. Due to the flammability and expl nature of the fine dust from igniter powders, no electric motors, hot plates, or other electrical equipment should be operated near the powder being screened. For drying operations, steam heat is preferred over electrical ovens... 

Use explosion-proof electrical/ventilating/ lighting/.../equipment. 

Fire and explosion prevention, dust control, proper storage of flammable liquids, grounding of electrical equipment, accessibility of extinguishers and hose lines, leak detection of reaction vessels, adequate ventilation of storage rooms, accumulation of solid wastes, static spark control (metal-free shoes, static bars on friction-generating machinery). 

Electronic control enclosures as well as other electrical equipment are best placed at a lower level, and away from gas generating units, process lines and storage containers. This is because hydrogen rises rapidly away from the ground and normally disperses quite quickly. Such placement is, however, not a substitute for appropriate enclosures since a slight breeze or draft can blow a hydrogen emission sideways and/or downwards, even when adequate ventilation has been provided for the gas to escape upwards and not collect. 

PERSONAL PROTECTION wear impervious gloves, footwear, and clothing wear splash-proof safety goggles above the flash point, use a closed system of local exhaust ventilation use explosion-proof electrical equipment wear positive pressure self-contained breathing apparatus maintain eyewash baths and safety showers in work area. 

PERSONAL PROTECTION Wear impervious protective clothing, including boots, chemical-resistant gloves, lab coat, apron or coveralls wear dust-proof safety goggles enclose operations and use local exhaust ventilation at site of chemical release use dust explosion-proof electrical equipment and lighting for extra personal protection, chemical protection suit including self-contained breathing apparatus is recommended. 

PERSONAL PROTECTION Wear gaslight suit and viton7 rubber gloves wear approved chemical safety goggles material should be handled or transferred in an approved fume hood or with adequate ventilation electrically ground all equipment when handling this product a NIOSH approved air supplied respirator is recommended in absence of proper environmental controls maintain eyewash baths and safety showers in work area. 

DISPOSAL AND STORAGE METHODS eollect powdered material and deposit in sealed containers store in tightly closed containers in a cool, well-ventilated area away from water and moisture separate from acids, alkalies, halogenated compounds, oxidizers, combustible materials use explosion-proof electrical equipment and fittings. 

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