Dusts airborne

Typieally, you will find that there is a reasonable eoneern about exposure to dusts on many sites. It you find that dusts are a potential eoneern, eonsider adding the following information to the HASP doeument. 

Developing a Site-Specific Health and Safety Plan 62 

Stand up-wind whenever intrusive aetivities oeeur and generate visible signs of airborne dust. 

Monitor for airborne dust (surfaee or subsurfaee soil) with portable, aerosol dust direet reading instruments. 

Utilize wet methods (spraying ground, wet drilling, ete.) when visible signs of airborne dust are generated. 

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Transparent siUca can normally be used in air continuously at temperatures up to 1000°C and for short periods up to 1250°C without devitrification occurring. This recommendation assumes, however, that the glass surface is substantially free of alkaU contamination which can occur from sources, such as airborne dust or fingerprints. 

Operating conditions that also must be considered in selecting the enclosure type are exposure to airborne dust, dirt and moisture, the possibility of corrosive dust or vapors in the area, and the expected maximum ambient temperature. 

In the forcc-ventilated or drip-proof types, the cooling air passes directly over the motor winding insulation. As a rule of thumb, a motor requires about 4,000 cfm of cooling air per thousand horsepower. Therefore, the possibilities of airborne dust and dirt collecting on the winding must he considered carefully. Filters in the air intake will lessen the hazards of this condition. Not much can be done about moisture drawn in with the cooling air, but careful selection of motor location inside ihe shelter can minimize the amount of wind-blown rain striking the motor. 

Simple gravimetry of the sample is likely to be an integral component of the determination of, e.g., the concentration of, or exposures to, airborne dust. Care is required to avoid errors arising from absorption of atmospheric moisture. Tliis can be avoided by using blank filters, by conditioning the filters in an atmospherically-controlled room, or use of a desiccator. 

Tube blockage caused by airborne dusts, affecting the flow rate. 

Discrimination between fire types in samples of airborne dust on filters using microscopy... 

Cristobalite in respirable airborne dust Lab method using X-ray diffraction (direct method) 76... 

Asbestos exposure limits and measurement of airborne dust concentrations... 

Quartz m respirable airborne dusts (direct method)... 

Benzene m air (porous polymer diffusion samplers, thermal desoiption and gas chromatography) Quartz in respirable airborne dusts (X-ray diffraction)... 

A well-designed auxiliary-air-supplied hood reduces air-conditioning costs and improves hood capture efficiency. The disadvantages of this hood include higher initial cost and maintenance due to the additional replacement air system, the possible introduction of airborne dust into the laboratory, discomfort... 

TOTAL INHALABLE DUST The fraction of airborne dust which enters the nose and mouth during breathing and is available for deposition in the respiratory tract. 

MDHS38 Quartz in respirable airborne dusts (KBr disc technique). 

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