Respiratory protective hood

Quarter mask (EN 140) Filtering half mask (EN 149) Respiratory protective hood ... 

Personal protective equipment (PPE)—Examples include protective suits, gloves, foot covering, respiratory protection, hoods, safety glasses, goggles, and face shields. pH— A scale indicating the acidity or alkalinity of aqueous solutions. 

Respiratory protective devices - Powered filtering devices incorporating a helmet or a hood - Requirements, testing, marking. Superseded BS EN 146 1992... 

Personnel protective equipment may be used in certain circumstances where exposure to airborne particulates contaminated with chemical carcinogens could occur. In those situations, personnel should be equipped with a complete clothing change, as well as respiratory protection selected on the basis of work performed, type of chemical used, and containment equipment. The respiratory protection may be a face mask, respirator [selected from those approved by the National Institute for Occupational Safety and Health (NIOSH)] (4, 5), or emergency breathing air system. In the latter case, a head hood or a complete protective suit may be used with a breathing air supply system. Figure 2. 

Figure 2. Respiratory protective equipment. Full-mask facepiece, half-mask facepiece, air-supplied head hood.

Level B is used when the highest level of respiratory protection is required, but skin and eye protection will suffice with splash resistant gear. The equipment includes SCBA and splash resistant clothing, hood, gloves, hardhat, boots, booties, and two-way communication and cooling system. 

PERSONAL PROTECTION Wear impervious protective clothing, including boots, chemical-resistant gloves, lab coat, apron or coveralls wear chemical safety goggles handle only in a chemical fiime hood for respiratory protection, use appropriate OSHA/MSHA approved safety equipment. 

Respiratory Protection To assess the safety of any particular operation, measurement of the solvent vapor exposure to workers in the area is recommended. If it is determined that the concentration in air is less than the recommended TWA for the solvent, no injury would be expected to workmen. If changes are made in the operation, which may result in an increase in concentration, duration, or frequency of exposure, measurements should be repeated. The degree of hazard can be minimized by containing the cleaning operation in an enclosed area, such as a hood, by ventilation that removes the vapors from the workroom air away from workers. The use of personal protective devices, such as gas masks, respirators, and self-contained or remote breathing apparatus, are not recommended for continuous use but can be effective for handling spills or similar upsets. 

Adequate general ventilation, provision of appropriate containment equipment (fume hoods, safety cabinets, or localized exhaust systems), procedural controls, or use of personal protective equipment, respiratory protection, and protective gloves, clothing, and eye protection are all part of a possible program to reduce exposures. 

Supplement the protection provided by the fume hood with the use of respiratory protection, if needed, to achieve compliance with airborne concentration limits. 

Ifa laboratory is properly designed and operated,withadequateventilationandefficientfume hoods or other types of safety cabinets, additional respiratory protection normally will not be needed formostprocedures. However, in theevent ofan accident oran unusual operation which cannot be performed in ahood,orwhenworkingwithhighly toxic substances, laboratory persons working with toxic materials should be included in a respiratory protection program, managed by the institution or corporation. There are a few situations which should require the availability of respiratory protection immediately at hand. 

Describe special clothing or respiratory protection required . Appropriate gloves and other personnel protective equipment are used when working in the ventflation hoods with the low activity, product dilution samples. Anticontaminatiop clothing and respirators may be required when entering Zone 2A for maintenance. ... 

In the event of a gaseous ammonia leak, shut down aU ignition sources and ventilate the area at once to prevent flammable mixtures from forming. Carefully remove cylinders with slow leaks to a fume hood or remote outdoor location. Limit access to an affected area. Respiratory protection may be necessary in the event of a large... 

To respond to a release, use appropriate protective equipment and clothing. Positive pressnre air-snpplied respiratory protection is required. Close cylinder valve and ventilate area. Remove cylinder to a fume hood or remote area if it cannot be shut off. Emergency response and rescue procedures should be in place before beginning work with arsine. Local rescne assistance may be needed and should be prearranged. Excess arsine shonld be returned to the manufacturer, according to your institution s waste disposal guidelines. For more information on disposal procedures, see Chapter 7 of this volume. 

In the event of accidental release of boron trifluoride gas, evacuate the area, and if the cause of the release is a leaking cylinder, remove the cylinder to a fume hood or open area if it is possible to do so safely. Positive pressure air-supplied respiratory protection and protective elothing may be necessary to deal with a leaking cylinder of boron trifluoride, and emergency response personnel should be notified. 

In ease of aceidental release of chlorine gas, sueh as from a leaking cylinder or associated apparatus, evacuate the area and eliminate the source of the leak if this can be done safely. Full-face suppUed-air respiratory protection and protective clothing may be required to deal with a ehlorine release. Cylinders with slow leaks should be carefully removed to a fume hood or remote outdoor locations. Chlorine leaks may he detected by passing a rag dampened with aqueous ammonia over the suspected valve or fitting. White fumes indicate escaping chlorine gas. 

In the event of a spill, remove all ignition sources and close off the hood. Diazomethane solutions can be soaked up with a spill pillow or an absorbent material such as clay or vermiculite, placed in an appropriate container, and disposed of properly. Respiratory protection may be necessary in the event of a large spill or release in a confined area. 

In the event of a small leak, stop flow of gas if possible, or move cylinder to a fume hood or to a safe location in the open air. Accidental releases of fluorine require evacuation of the affected area and should be handled only by trained personnel equipped with proper protective clothing and respiratory protection. 

In the event of a release of nitrogen dioxide, use appropriate protective equipment and clothing. Positive pressure air-supplied respiratory protection may be required in cases involving a large release of nitrogen dioxide gas. If a cylinder is the source of the leak and the leak cannot be stopped, remove the leaking cylinder to a fume hood or a safe place, if possible, in the open air, and repair the leak or allow the cylinder to empty. 

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