Fire-hazard classes

Laboratories are classified as Class A (High Fire Hazard), Class B (Moderate Fire Hazard), Class C (Low Fire Hazard), or Class D (Minimal Fire Hazard), according to the quantities of flammable and combustible liquids each is allowed to have. Table 8-16 and Table 8-17 (NFPA45) describe the flammable and combustible liquids limitations and the requirements involving automatic sprinkler protection and fire-resistive partition wall separations. The tables apply to laboratories less than 10,000 ft (929 m ) area and should be suitable for most labs in processing facilities. 

Laboratory Unit Fire Hazard Class Flammable and Combustible Liquid Class Maximum per 100 fP (9.3 m") of Laboratory Unit gal (1) Maximum per Laboratory Unit gal (1) Maximum per lOOfP (9.3 m ) of Laboratory Unit gal (1) M[Pg.308]

Laboratory Unit Fire Hazard Class Fire Separation-Fire-Resistive Partition Rating ... 

Fire extinguishers must match the type and class of fire hazards associated with the particular laboratory. Four fire hazard classes are defined by the U.S. Department of Labor Classes A, B, C and D. 

Recognition of three electrical fire-hazard classes by using the learning machine was examined by Ueisel and Fasching C3273. A set of 13 features was derived for 47 chemical compounds from physical measurements and structural information. However, only 67 % of the compounds could be classified correctly. 

TABLE 8.2.1.1 NFPA 45-2004 Code Allowable Container Sizes lor Flammable and Combustible Liquids/Maximum Quantity Allowed Outside Storage Cabinet per 100 fl Laboratory Space with Sprinkler System for Laboratory Unit Fire Hazard Class C... 

Laboratory Unit Fire Hazard Class C is an Instructional Laboratory Unit—above 12th grade and below postcollege graduate level (i.e., undCT-... 

What is the total quantity of Class I flammables allowed to be stored outside a storage cabinet, per 100 ft, for a laboratory unit in Fire Hazard Class C ... 

Health nd Safety Factors. The mononitrochlorobenzenes are toxic substances which may be absorbed through the skin and lungs giving rise to methemoglobin. Their toxicity is about the same as or greater than that of nitrobenzene. The para isomer is less toxic than the ortho isomer, and the maximum allowable concentration that has been adopted for -nitrochlorobenzene is 1 mg/m (0.1 ppm) (6). The mononitrochlorobenzenes are moderate fire hazards when exposed to heat or flame. They ate classified by the ICC as Class-B poisons. The same handling precautions should be used for these compounds as are used for nitrobenzene. 

Fire Hazards - Flash Point (deg. F) (a) <0 CC (b) 0 - 73 CC (3) 73 -141 CC Flammable Limits in Air (%) Data not available Fire Extinguishing Agents Foam, carbon dioxide, dry chemical Fire Extinguishing Agents Not to be Used Water may be ineffective Special Hazards of Combustion Products Not pertinent Behavior in Fire Not pertinent Ignition Temperature Data not available Electrical Hazard Class I, Group D Burning Rate Approx. 4 mm/min. 

Used Not pertinent Special Hazards of Combustion Products Not pertinent Behavior in Fire Vapors may explode Ignition Temperature (deg. F) 437 Electrical Hazard Class I, Group D Bunting Rate 7.3 mm/min. 

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