The U.S. Occupational Health and Safety Administration (OSHA) defines a flammable liquid as "any liquid having a flash point below
37.8 degree C. (100 deg. F), except for any mixture having components with flash points of 37.8 degree C. (100 deg. F) or above that
temperature, the total of which make up 99% or more of the total volume of the mixture. Flammable liquids following the condition
shall be known as Class I liquids."
For anything to catch fire or explode, there has to be the right composition of heat, fuel and oxygen. These are well-defined by
the flammable limits (also called the explosive limits), which are specific for each material.
The OSHA Standard 29 CFR 1910.106 for Flammable and Combustible Liquids, covers the following:
• Tanks and their construction
• Piping, valves and fittings
• Container and portable tank storage
• Industrial plants
• Bulk plants
• Service stations
• Processing plants
• Refineries, chemical plants, and distilleries
Proper storage and handling of flammable materials is absolutely very important in maintaining a safe work place. Never ever use
flammable materials near sources of heat, flame, sparks or static discharge (direct sunlight, furnaces, pilot lights etc.) or in
areas which are unventilated. Since solvent vapors are heavier than air. These can crowded in low-lying areas and can travel
significant distances to an ignition source.
Flowing liquids can generate static electricity (an invisible ghost), when transferring liquids from one vessel to another, be sure to
follow proper bonding and grounding procedures.
Also be careful when cutting or welding storage tanks and pipes having flammable material.