Gasoline Safety

What is Gasoline Safety?

A landscaping crew supervisor in Orlando was refueling a commercial string trimmer on the back of his work trailer when he spilled approximately half a cup of gasoline on the hot exhaust muffler of the trimmer he had shut off only 30 seconds earlier. The gasoline flash-ignited, and the flames spread instantly to the fuel container he was still holding, which was an open-top plastic cup he had been using to pour from the 5-gallon safety can because "the spout was too slow." The burning gasoline splashed onto his arms and legs as he dropped the cup, and he suffered second- and third-degree burns over 15 percent of his body. The approved safety can with its spring-loaded spout would have prevented the spill and the ignition entirely.

Gasoline safety encompasses the handling, storage, transport, and fueling practices required to control the extreme fire and explosion hazard of gasoline and its vapors. Gasoline is one of the most dangerous common substances in the workplace -- its vapors are heavier than air, can travel long distances to reach ignition sources, and ignite at concentrations as low as 1.4 percent in air, making it capable of explosive ignition from a spark, static discharge, or hot surface far from the point of the spill.

Key Components

1. Understanding Gasoline Vapor Hazards

• Gasoline vapors, not the liquid itself, are what ignite and explode -- a single gallon of gasoline produces enough vapor to create 140,000 cubic feet of explosive atmosphere under the right conditions
• Gasoline vapors are three to four times heavier than air, which means they flow downhill, collect in low spots, basements, and trenches, and can travel 12 feet or more to reach an ignition source
• The flash point of gasoline is minus 45 degrees Fahrenheit, meaning it produces ignitable vapors at every temperature humans can survive in, making it a constant ignition risk year-round
• Static electricity, cell phones near spills, nearby pilot lights, running engines, lit cigarettes, and even light switches can provide the tiny spark needed to ignite a gasoline vapor cloud

2. Safe Handling and Fueling Practices

• Use only approved safety containers -- typically red with spring-loaded caps, flame arrestor screens, and self-closing spouts -- for storing and dispensing gasoline in quantities under five gallons
• Always shut off engines and allow them to cool before refueling, because hot exhaust components, catalytic converters, and engine blocks can ignite gasoline vapors or liquid on contact
• Ground yourself before dispensing gasoline into portable containers by touching the metal container to the ground or to a grounded metal surface, eliminating the static charge that can ignite vapors at the fill point
• Never use gasoline as a cleaning solvent, fire starter, or for any purpose other than fuel, because every non-fuel use involves open containers, splashing, and uncontrolled vapor release in the presence of ignition sources

3. Storage, Spill Response, and Health Hazards

• Store gasoline containers outdoors or in well-ventilated detached structures away from living spaces, water heaters, furnaces, electrical panels, and any equipment with pilot lights or spark-producing components
• Clean up gasoline spills immediately using absorbent materials, ventilate the area thoroughly, and never wash gasoline into drains, storm sewers, or soil where vapors can accumulate in enclosed spaces below ground
• Recognize that gasoline is also a health hazard -- inhaling vapors causes headaches, dizziness, and nausea in the short term, and chronic exposure is linked to kidney damage and cancers including leukemia
• Never siphon gasoline by mouth, as swallowing even a small amount can cause chemical pneumonia if aspirated into the lungs, which can be fatal within hours

Building Your Safety Mindset

1. Respect the Invisible Vapor Cloud

   • Every time you open a gasoline container, visualize an invisible, heavier-than-air cloud of explosive vapor flowing outward and downward from the opening and reaching toward every ignition source within range
   • Eliminate all ignition sources within at least 20 feet of any gasoline handling operation, including running engines, smoking materials, and electrical devices that can produce sparks
   • Never assume outdoor ventilation is sufficient to disperse vapors quickly -- on calm days with no wind, gasoline vapors can pool at ground level and remain explosive for extended periods

2. Use the Right Container Every Time

   • Refuse to use open cups, bottles, unapproved cans, or any container not specifically designed and approved for gasoline, because the safety features built into approved containers exist to prevent exactly the scenarios that kill people
   • Inspect your safety containers regularly for damaged spouts, missing caps, cracked seals, and flame arrestor screens that have been removed or corroded through
   • Never store gasoline in glass containers, which can break and release the entire contents, or in non-approved plastic containers, which can build static charges and degrade over time

3. Plan Every Fueling Operation

   • Before fueling any equipment, identify where the vapors will go, what ignition sources are nearby, and what you will do if a spill occurs -- this 15-second assessment prevents the conditions that cause gasoline fires
   • Keep an appropriate fire extinguisher within reach during any fueling operation and know that water does not extinguish gasoline fires -- it spreads them
   • Designate fueling areas that are away from work zones, equipment storage, and building entrances, and enforce their use consistently rather than fueling wherever is most convenient

Discussion Points

1. What common gasoline handling shortcuts have you seen at work or at home that people justify as safe because "nothing has happened yet," and what is the actual risk each one creates?
2. How would you explain to a new worker why gasoline vapor is more dangerous than gasoline liquid, and why a nearly empty gas can is more explosive than a full one?
3. If a gasoline spill ignited on your worksite right now, what would you do in the first 10 seconds, and do you have the right extinguisher type within reach to respond effectively?

Action Steps

• Inspect every gasoline container in your work area and remove from service any that are not approved safety cans with spring-loaded caps, flame arrestors, and self-closing spouts
• Verify that all fueling operations occur in designated areas at least 20 feet from ignition sources and that engines are shut off and cooled before refueling begins
• Confirm that a Class B fire extinguisher is located within 25 feet of every gasoline storage and fueling area and that workers know water spreads gasoline fires rather than extinguishing them
• Review gasoline storage locations and relocate any containers that are stored near water heaters, electrical panels, furnaces, or other equipment with pilot lights or spark-producing components