OSHA standard 1910.106 pertains to the handling, storage and use of flammable and combustible liquids with a flashpoint below 200 F. The flashpoint is the minimum temperature at which a liquid gives off enough vapor to form an ignitable mixture. Below is listed the definitions for flammable and combustible liquids in general industry and construction:
|Construction - 1926.155||General Industry - 1910.106|
|Combustible liquids||A liquid having a flash point at or above 140 °F. (60 °C.) and below 200 °F. (93.4 °C.)||A liquid having a flashpoint at or above 100 °F. (37.8 °C.).|
|Flammable liquids||A liquid having a flash point below 140 °F. and having a vapor pressure not exceeding 40 pounds per square inch (absolute) at 100 °F.||A liquid having a flashpoint below 100 °F. (37.8 °C.), except any mixture having components with flashpoints of 100 °F. (37.8 °C.) or higher, the total of which make up 99 percent or more of the total volume of the mixture.|
There are two primary hazards associated with flammable and combustible liquids: explosion and fire. To prevent these hazards, the OSHA Standard addresses the primary concern of design and construction, ventilation, ignition sources and storage. This module will discuss each of these issues in more depth.
Flammable and combustible liquids are, in short, liquids that can burn. They are classified, or grouped, as either flammable or combustible by their flashpoints.
Fuels and many common products like solvents, thinners, cleaners, adhesives, paints, waxes and polishes may be flammable or combustible liquids. Everyone who works with these liquids must be aware of their hazards and how to work safely with them.
At normal room temperatures, flammable liquids can give off enough vapors to form burnable mixtures with the air. As a result, they can be a serious fire hazard. Flammable liquid fires burn very fast. They also give off a lot of heat and often clouds of thick, black, toxic smoke.
Combustible liquids at temperatures above their flashpoint also release enough vapor to form burnable mixtures with the air. Hot combustible liquids can be as serious a fire hazard as flammable liquids.
Spray mists of flammable and combustible liquids in the air may burn at any temperature, if an ignition source is present. The vapors of flammable and combustible liquids are usually invisible. They can also be hard to detect unless special instruments are used.
Most flammable and combustible liquids flow easily. A small spill can cover a large area of workbench or floor. Burning liquids can flow under doors, down stairs and even into nearby buildings. Materials like wood, cardboard and cloth can easily absorb flammable and combustible liquids. Even after a spill has been cleaned up, a dangerous amount of liquid could still remain in surrounding materials or clothing, giving off hazardous vapors.
Well-designed and maintained ventilation systems remove flammable vapors from the workplace and reduce the risk of fire and health problems. The amount and type of ventilation needed to minimize the hazards of flammable and combustible liquid vapors depend on such things as the kind of job, the kind and amount of materials used, and the size and layout of the work area.
An assessment of the specific ways flammable and combustible liquids are stored, handled, used and disposed of is the best way to find out if existing ventilation controls (and other hazard control methods) are adequate.
Some workplaces may need a complete system of hoods and ducts to provide acceptable ventilation. If flammable vapors are likely to condense, the ducts should have welded joints. Other workplaces may only require a single, well-placed exhaust fan. Use non-ferrous fan blades and shrouds, and explosion-proof electrical equipment in ventilation systems for these liquids. Regular cleaning of the ventilation system will decrease the severity of any fires and will reduce the likelihood of spontaneous combustion if some self-heating material is present. Ventilation equipment used to handle solvent vapors should meet the relevant fire code requirements.
Skin and eye contact needs to be avoided when working near flammable or combustible liquids. Safety glasses with side shields, laboratory coats (coveralls are acceptable in shop settings) and closed-toe shoes need to be worn when handling these materials. This is only minimum protection and must be upgraded if necessary. Additional Personal Protective Equipment (PPE) such as chemical goggles, face shields, chemical aprons, and chemical resistant gloves and respiratory protection MUST be worn if there is a greater chance of chemical exposure. An emergency eyewash and safety shower should be located in all areas where flammable or combustible liquids are used. If there is skin or eye contact, then flush the affected area for at least 15 minutes and report to your employer for evaluation and treatment.
Even if employees take all the necessary precautions to protect themselves from hazardous material spills, they still need to be ready to handle emergencies safely. In emergencies like chemical fires and spills, act fast.
Only specially trained people, equipped with the proper tools and protective equipment, should handle the emergency. Nobody else should go near the area until it is declared safe.
In closing, planning, training, and practicing for emergencies are important so everyone knows what they must do.
Napo in... Danger: chemicals! - episode 004 - Flammable. Know more about Napo.
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