Safely storing flammable liquids
Nearly every workplace has some flammable liquids, whether solvents, sprays, or fuels. To prevent fires, the Occupational Safety and Health Administration (OSHA) regulates storage of flammable liquids and aerosols.
The following gives an overview of storage requirements, including the special provisions for industrial plants where flammable liquids are used incidentally. Other provisions (not covered here) address bulk plants, service stations, refineries, chemical plants, or distilleries.
Containers and cabinets
Among other things, OSHA requires storing flammable liquids in approved containers. The allowable container depends on the volume and class of the liquid, as well as the container material (glass, metal, or approved plastic).
In many cases, specially-designed storage cabinets will be needed. No more than 60 gallons of Category 1, 2, or 3 liquids, nor more than 120 gallons of Category 4 liquids may be stored in a cabinet. Cabinets must be labeled, “Flammable – Keep Fire Away.”
When a cabinet does not provide enough capacity, employers may need a storage room. If your facility has a storage room, make sure you understand the limitations and requirements for using it.
Fire control devices, such as portable fire extinguishers, must be available where flammable liquids are stored.
Incidental use at industrial plants
Not every manufacturer relies on chemical reactions, and the use of flammable liquids is incidental to the business, such as flammable finishing materials used in furniture manufacturing.
These flammable liquids must still be stored in tanks or closed containers, but might not require a cabinet. The quantity that may be located outside of a storage cabinet or room must not exceed:
- 25 gallons of Category 1 liquids in containers
- 120 gallons of Category 2, 3, or 4 liquids in containers
- 660 gallons of Category 2, 3, or 4 liquids in a single portable tank
OSHA also provides exceptions for flammable paints, oils, or varnishes used for maintenance when they are not kept for more than 30 days.
The regulation at 1910.106 has more detail than could be provided here, but the key issues include knowing the quantity of flammable liquids and the class of those liquids, and how long the material will be kept. These factors affect the acceptable storage methods.