1. Move it immediately.
Wear protective gloves and goggles, support the bottom with both hands, and avoid rolling or throwing it. Move the bulging can outdoors or to a well-ventilated, isolated area away from sources of fire, heat, or people. Place clear warning signs.
2. Prepare for pressure relief.
The operator should wear anti-static work clothing and a face shield or impact-resistant goggles. Stand sideways to the can opening, never facing the lid.
Tools: Hand socket wrench or pliers. Do not use any power tools.
3. Loosen the lid in stages to relieve pressure. Start by loosening the retaining bolts one turn (do not remove completely) until you hear a hissing sound. Once the puffing sound subsides, loosen a second turn until all the gas is exhausted. If the bolts are deformed and cannot be loosened, use a flat-blade screwdriver to slowly pry a gap between the lid and the barrel. Again, pause when you hear a sound, and repeat several times until the pressure is released. 4. Additional Safety Measures
Place a damp cloth or soft pad over the gap to prevent the contents from accidentally splashing.
If the tank is severely deformed and the lid cannot be loosened, slowly drill a small hole in the tank below the liquid level with a hand drill to relieve the pressure. (This step is risky and is recommended for a professional hazardous waste disposal agency.)
5. Post-processing
After the gas is exhausted and pressure is confirmed to be zero, seal the tank with a chemical-resistant bag and contact a local qualified hazardous waste disposal agency for collection. Do not discard or incinerate it.
