Module 7 - IAFF

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IAFF Training for Hazardous Materials: Technician© Student Text Level B Protection Level B protection affords the user with the highest level of respiratory protection and protection against contact with product from spills and splashes. This level of protection should never be used when there is a possibility of contact with a dangerous vapor/gas. The NFPA standard for Level B protective garments is NFPA 1992, Standard for Splash-Protective Suits for Hazardous Chemical Emergencies. Suits meeting this standard are called for in NFPA 471—Recommended Practice for Responding to Hazardous Materials Incidents. Tests done on NFPA 1992 suits are for penetration, not permeation. Many manufacturers supply permeation data for their 1992 compliant garments because they use the same materials as in their 1991 garments. The standard was written to define construction for splash resistance and is concerned with liquid leaks through seams, closures and attachments. This is a critical issue to understand. The standard also eliminated tests against chemicals that were gases, or considered to be a hazard by skin contact or absorption, or carcinogenic. Compliant Level B garments require that SCBA be covered. Most manufacturers accomplish this by placing the SCBA inside the upper half of the suit. Many of these garments can be as confining, if not more confining, than compliant Level A suits. Indications for Using Level B Protection • “The highest level of respiratory protection is necessary, but a lesser level of skin protection is needed.” (1910.120, Appendix B) • Probable exposure to low concentrations—incidental splash • Chemical is mainly a respiratory hazard Level B Advantages • High level of respiratory protection • Increased mobility/dexterity (theoretically) • May be cooler • Compliant garments have good penetration characteristics • Cost—ranges from $45 (non-compliant) to $1,500 7-26 Module 7: Personal Protective Equipment
Student Text IAFF Training for Hazardous Materials: Technician© Level B Limitations • Not gas/vapor tight—not designed to protect from vapors/gases • Not designed or tested (NFPA 1992) to be used at scenes involving carcinogens or skin absorbable chemicals • Non compliant Level B may still leak in liquids • Non compliant Level B offers no thermal protection Questions 1. Recall the last incident you responded to, in which Level B PPE was worn. Was this level the highest level of protection worn at the incident? What was the hazard? 2. Have you ever donned Level B PPE? What were the primary problems you experienced? 3. What are some types of incidents that may require Level B PPE? ASTM F1001 Chemicals Used in Testing Level B Clothing (Liquid, Non-Skin, Non-Carcinogenic) Chemical Acetone Acetonitrile Ammonia Gas n-Hexane Chemical Class Ketones Nitriles Inorganic gases/vapor Hydrocarbons 40% Sodium hydroxide Inorganic bases 95% Sulfuric acid Inorganic acids Tetrahydrofuran Ethers Table 7.2 Module 7: Personal Protective Equipment 7-27
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Module 7 - IAFF

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