A pick-up truck pulling a trailer carrying compressed hydrogen crashed in Ohio yesterday. The hydrogen leaked and ignited, producing flames ten metres into the air. The hydrogen quantity transported was 450 kg.

The incident consisted of a leakage of potassium hydroxide solution (KOH) from an alkaline electrolyzer in a renewable hydrogen production plant. One webpage news reported that smoke formation triggered the fire alarm system. According to the manufacturer, the equipment shut down and automatically went into safety mode in accordance with the integrated safety system.Nobody was injured in the event and there was no damage on the environment.

A researcher was conducting an experiment that involved sawdust being heated at pressure using hydrogen gas in an laboratory-scale autoclave.The gas leaked from the autoclave during the experiment and ignited, causing injuries to the scientist (cuts, bruises and facial burns).The explosion caused extensive damage to the building, propelling debris more than 20 metres into a garden area.

[NOTE: the attribution to hydrogen formation as cause of the explosion is 'probable 'but not fully demonstrated].Two explosions in two different sprinkler systems occurred, wit the same assumed cause.The first occurred at the premises of a company, where a service engineer was injured, even though the explosion actually moved out into the open air. The second occurred in the department store, where an installation contractor was burned because an explosion occurred in a large pressure storage tank in a small room with the result that the explosion was particularly powerful.

There was a massive explosion at one of the generator-turbine units of a coal-based power station. Undetected hydrogen leak from the generator was identified as a major trigger.According to the news, some workers, unaware of the leak, were trying to fix some dirt blocks and loose nuts and bearings in the generator. Just below was an oil tank. Fire sparked spread in minutes up to 16 metres, setting off the blast with a heavy noise.It took hours to control the fire. Four persons were injured.

A hydrogen car caught fire at a hydrogen fuelling station. During refuelling of a H2-fueled car the owner heard an abnormal noise and opened the fuel filler door to investigate. A small fire then occurred after the owner discharged static electricity when making contact with the fuelling cap. Fortunately, the fire suppression system of the refuelling station quickly extinguished the blaze.An analysis of this incident revealed that material from the fuel inlet receptacle filter detached shortly after fuelling was completed.

An explosion occurred while inflating a balloon with hydrogen gas. The News reported the involvement of the hydrogen bottle.

The hydrogen possible leaked and ignited from a tank which was inside a car parked in a hospital underground parking garage. The tank was supposed to be used for launching a weather balloon. Two people were injured and are being treated in the Emergency Department. The explosion damaged at least three other cars in the parking garage.The cause is under investigation by Detroit police and fire. The parking garage does not appear to have sustained any structural damage.

Hydrogen leak due to a fault with non-process related battery equipment.After reporting the hydrogen leak, fire crews have been called to a gas terminal. The leak was due to a fault with non-process related battery equipment.

At least one person was injured in an explosion at a theatre building. The investigation concluded that the accident has been caused by hydrogen entering the sprinkler room from the sprinkler piping, during maintenance of the building's sprinkler system. Together with indoor air, it formed a flammable mix of hydrogen gas and air. it is known that hydrogen forms in pipes due to corrosion of the pipe internal zinc coating by oxygen and water. The investigation could not identify the exact cause of the ignition.