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Crash involving a Heavy Duty Vehicle Transporting Compressed Gases (852)

The truck was carrying cylinders of nitrogen (N2), oxygen (O2), hydrogen (H2) and acetylene on a national road. It struck the right protection, then the concrete-reinforced central division, and finally overturned across the roadway. The driver is slightly injured, no cylinder is damaged. Traffic jams are formed in both directions. The presence of motorists on the emergency stop strip slows the arrival of firefighters. Rescuers set up a security perimeter and cut traffic in one direction. Technical teams of the carrier and the charger go to the scene.

A Leak of Hydrogen, Methane and Hydrogen Sulfide from a Pipe in a Refinery (851)

The leak occurred on a process pipe of a pressurized at 17 bar and located 3.5 m from the ground The gaseous mixture composed of hydrogen, methane and hydrogen sulfide (density: 0.6) was released to the atmosphere. The operator evacuated a hundred employees, stopped production and put the establishment in the safe mode. The emergency plan is triggered. Water curtains are put into action and measurements of toxicity and explosimetry are carried out.

Hydrogen Transport Truck Crash (850)

The vehicle involved consisted of a tractor and semi-trailer and was carrying 17 cylinders of 200 m of compressed hydrogen each. The driver lost control of the vehicle, crossed the traffic lanes and stopped against the median barriers of a motorway. The driver was slightly injured but no leak was detected on the cylinders. The emergency services establish a security perimeter, interrupt the traffic in both directions and install two protection lances. Approximately two hours later, traffic on the highway is partially reopened in the south-north direction.

Unintended Hydrogen Formation from a Truck with Chemical Tank (849)

In the collective treatment plant of a chemical platform, the truck tank of 25 m containing hydrochloric acid (HCl) rose in pressure at 11 am; leakage of acid solution and gas evolution occurred in the upper part of the tank.The emergency plan of the site was triggered. The rescue confined 5 employees and switched off the electrical power on the site. The police interrupted the traffic. Reliefs opened the manhole of the tank to reduce the internal pressure. At 6pm, they measure 124, 923 and 230 ppm of HCl around the 3 manholes and a hydrogen (H2) level below the LEL.

Hydrogen and Gasoline Fire on an Heat Exchanger in a Refinery (848)

A fire, fuelled by a mixture of gasoline and hydrogen, occurred on a heat exchanger located at 15 m height in a gasoline processing unit of a refinery. The operator triggered the emergency plan. Site rescue teams controlled the fire during the depressurisation phase of the unit. After the fire was extinguished, the unit was put under nitrogen before being inspected to assess the damage. The fire did not have a significant impact on the operation of the site.

Road Accident involving a Liquid Hydrogen Transporter (847)

A 40,000-litre capacity tanker lorry carrying liquid hydrogen tipped over into a ditch on a curve in an intersection while travelling on a municipal road at the edge of town. The lorry had just left a SEVESO-rated industrial gas production plant.The cistern was retained by an electrical tower and did not completely overturn. A whitish cloud dispersed through the degassing chimney on top of the cistern. First responders set up a 200-m safety perimeter and evacuate the neighbours. The containers internal pressure remains at approximately 0.1 relative bar.

Explosion in a Chemical Plant Manufacturing Fuel Additives (846)

The accident occurred during the first phase of the batch synthesis of tricarbonyl compound (methylcyclopentadienyl) manganese (TMCM), while the reaction mixture in the reactor consisted of more than 0.5 t of sodium and organic compounds. Reaction runaway with hydrogen production caused a large increase in pressure and temperature leading to a rupture of the reactor (above 100 bar). The ignition of the released flammable cloud led to the formation of a fireball and generated a large heat flux.
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