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Cleanlink News 4/15/2009

Guide: Safe Handling of Flammable Liquids


Processing plants that require large quantities of flammable or combustible liquids often transfer these materials through closed piping systems. However, far more plants use these substances in smaller amounts and rely on manual methods to transfer the liquids from storage points to workstations. Although manual transfer involves having hazardous materials in open areas, following certain steps and using proper equipment can minimize the danger.

OSHA regulations require approved safety cans to transfer flammable liquids. Its broad criteria define a safety can as “an approved safety container, of not more than 5 gallons capacity, having a spring closing lid and spout cover and so designed that it will safely relieve internal pressure when subjected to fire exposure.”

Dozens of types and sizes of safety cans exist. Selecting the best type for the job is the key to safe and easy transfer and use of flammable liquids.

Flammable liquid transfer applications can be grouped into three categories: general process, gas powered equipment and other equipment using containers with small openings and laboratories and other small capacity uses.

General Process Applications
In an industrial plant, flammable cleaning solvents commonly are used to wash parts in bench cans, rinse and wash tanks and automatic washers. This equipment must be refilled periodically.

Often, flammable chemicals that are used in these factory processes are carried from storage areas in Type I single-spout safety cans. Type I safety cans are different from the typical poly gas can you see at your local big retailer or hardware store. They are built to specifications set forth by OSHA and the National Fire and Protection Association (NFPA). Type I safety cans are made of steel or polyethylene and go up to a 5-gallon capacity. Application is the principal criterion affecting size selection. For example, an operator can use a smaller safety can to fill a bench can faster and with less risk of a spill rather than using a 5-gallon can, even though both meet OSHA requirements. Similarly, for filling wash tanks, rinse tanks and other large containers, large-size cans are more efficient.

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