In a textile factory, at the start of a shift following the weekend shutdown, a forklift operator heard a dripping sound while recharging the forklift and discovered a gas leak in the 12-m³ propane supply tank. He alerted the team leader, who called the fire department and evacuated the staff and employees of the company next door. The fire department arrived at the scene at 7 am and set up a safety perimeter. Company activity was temporarily suspended. The propane leak on the outer flange of the manhole was rapidly brought under control. Explosimeter samples taken at a distance of 3 m around the tank turned out to be negative. The team leader called the service provider, who intervened from 9:15 am to 3:40 pm in order to empty the tank and render it inert. At 3:40 pm, fire-fighters left and the service provider installed a new tank. This intervention ended at around 10 pm. This site was forced to close during the second half of 2007; it was planned to eventually return the faulty tank to the company’s headquarters. In the initial analysis, the operator mentioned the rise in outside temperature over several days, which could have had an effect on the outer flange of the tank. The tank was filled to 85% on 11th July at 1:40 pm. A periodic inspection of the tank was carried out by the service provider on 2nd July and raised no particular comment. After this incident, the operator changed its warning procedure with respect to the regulation. The tank in question was to be disassembled on the premises of the service provider in the presence of a third party expert and give rise to a special report to be submitted to the Classified Facilities Inspectorate.