Anemometers often cannot be used if the duct contains dust or mist because air must actually pass through the instrument for it to work. No quantity of paint can be stored in any exits, stairways or public hallways. Close the mixing room door Closing the door prevents vapors in the mixing room from entering the … The meter should always be read in the upright position, and only the tubing supplied with the equipment should be used. Investigate the background and objectives of the project. Please click the button below to continue. Lack of make-up air (high negative pressures affect propeller fan system output; lack of supplied make-up air causes high airflow velocities at doors and windows). Use filters with a 50-70% collection efficiency rating. Use of the six-and-three rule ensures better design by providing for a minimum loss at six diameters of straight duct at the fan inlet and a minimum loss at three diameters of straight duct at the fan outlet (Figure II:3-7). Table III:3-4 lists preventive measures for controlling microbial problems in ventilation systems. Air flow in industrial ventilation ducts is almost always turbulent, with a small, nonmoving boundary layer at the surface of the duct. Health-Related Ventilation Standards Other Than Airflow. The second phase of the investigation involves an examination of the ventilation system's physical and operating characteristics. The measurement can be made with a pitot tube or by a static pressure tap into the duct sheet metal (see Figure III:3-3), Figure III:3-3. Stacks disperse exhaust air into the ambient environment. If the duct diameter (D) is 6 inches, then the maximum distance of the emission source from the hood should not exceed 9 in. Grinding, polishing, and buffing operations, 29 CFR 1910.252(c)(2)(i)(a) and (b); (c)(2)(ii), Ventilation for general welding and cutting--General, Fluorine compounds--Maximum allowable concentration, Ventilation and protection in welding, cutting and h eating--Gal welding, cutting, and heating, Ventilation and protection in welding, cutting, and heating--General welding, cutting, and heating, Abrasive blasting--Personal protective equipment, Abrasive blasting--Air supply and air compressors, Abrasive blasting--Operational procedures and general safety, Open surface tanks--Special precautions for cyanide, Open surface tanks--Inspection, installation and maintenance, Open surface tanks--Vapor degreasing tanks, Hydrogen--Gaseous hydrogen systems--Separate buildings, Hydrogen--Gaseous hydrogen systems--Special rooms, Hydrogen--Liquid hydrogen systems--Separate buildings, Hydrogen--Liquid hydrogen systems--Special rooms, Flammable and combustible liquids--Container and portable tank storage--Design and construction of inside storage room--Ventilation, Flammable and combustible liquids--Industrial plants--Unit physical operations--Ventilation, Flammable and combustible liquids--Bulk plants--Building--Ventilation, Flammable and combustible liquids--Processing plants--Processing building--Ventilation, Spray finishing using flammable and combustible materials--Spray booths--Dry type overspray collectors, Spray finishing using flammable and combustible materials--Ventilation--Conformance--General, Spray finishing using flammable and combustible materials--Electrostatic hand spraying equipment--Ventilation, Dip tanks containing flammable combustible liquids--Ventilation--Ventilation combined with drying, Precautions before entering--Flammable atmospheres and residues, Cleaning and other cold work (flammable vapors), Painting--Paints and tanks coatings dissolved in highly volatile, toxic and/or flammable solvents, Compressed Air--Ventilation and air quality--(Tunnels), Welding, cutting and brazing--Health protection and ventilating--Ventilation for general welding and cutting--General, Welding, cutting and brazing--Health protection and ventilating--Ventilation in confined spaces, Welding, cutting and brazing--Fluorine compounds, Welding, cutting and brazing--Zinc--Confined spaces, Welding, cutting and brazing--Lead--Confined spaces, Ventilation and protection in welding, cutting and heating--Welding, cutting and heating in confined spaces, Ventilation and protection in welding, cutting and heating--Welding, cutting or heating of metals of toxic significance, Tunnels and shafts--Air quality and ventilation, Precautions before entering--Toxic atmospheres and residues, Precautions before entering--Oxygen deficient atmospheres, Mechanical paint removers--Power tools--(paint dust), Ventilation and protection in welding, cutting and heating--Welding, cutting and heating confined spaces. Cleaning and filtering devices that ensure continuous and reliable collection of the contaminant should be used. Figure III:3-2. Avoid designs that require that the velocities through some openings be very high in order to develop the minimum acceptable velocity through other openings or parts of the hood. Outside air for ventilation or makeup air for exhaust systems may bring contaminants into the workplace (e.g., vehicle exhaust, fugitive emissions from a neighboring smelter). Different types of air cleaners are made to remove particulates (e.g., precipitators, cyclones, etc.) Reduced capture velocities or excessive fugitive emissions. Figure III:3-6 provides a guide for determining an effective flange width. Remove stagnant water and slime from mechanical equipment. Historically, air-conditioning has been used in industry to improve or protect machinery, products, and processes. Time the smoke plume's travel over a two-foot distance. This helps both to contain the material and to minimize the effect of room air. Investigation Phases distribution ducts, boxes, plenums, and registers. Mark ambiguous phrases, "legalese," and repetition. The design of the air cleaner depends on the degree of cleaning required. American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). be exhausted outside the building and not recirculated. (The average velocity pressure is about 81% of centerline velocity pressure.). add make-up air where it will be most effective. 1988. National Institute for Occupational Safety and Health (NIOSH). 8th ed. Standard Paint Kitchen. Any paint booth manufacturer should have this type of construction built in right out of the box. 1991. Ventilation criteria or standards are included in OSHA regulatory codes for job- or task-specific worker protection (see Appendix III:3-3). ASHRAE is a society of heating and air conditioning engineers that has produced, through consensus, a number of standards related to indoor air quality, filter performance and testing, and HVAC systems. The purpose of most ventilation systems is to prevent worker inhalation of contaminants. Similarly, the minimum capture velocity should not be less than 50 fpm. Calculate the velocity in feet per minute. The conditioning of air for humans has become normal and expected. For this reason, the hood should be located so that contaminants are not drawn through the worker's breathing zone. Use of Smoke to Demonstrate Air Flow. Washington, DC 20210
The drawings come in several views: plan (top), elevation (side and front), isometric, or section. In addition, OSHA has requirements for the design of equipment and operations involved in spraying flammable or combustible materials. In practice, replacement depends on mixing efficiency. Standard hood designs may not be adequate to contain highly toxic materials. The system should include feedback devices that monitor system performance, e.g., static pressure taps, particulate counters, amperage monitors. Special Conditions Standards. type and concentration of contaminants in the air (because this affects the fan type and materials of construction); and. Paint storage rooms have a different classification from a paint mixing room. The correct amount of air should be supplied to the space. Avoid high-velocity drafts through cracks in walls, under doors, and through windows; Avoid differential pressures on doors, exits, and windows; and. 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