The incident occurred in a facility chrome-plating metals. At the time of the event, a metal roller was being chrome-plated. A short circuit occurred due to a defective contacting (contact rails) on the rectifier. This short circuit caused a spark to reach the surface of the electrolyte bath, and the spark ignited the hydrogen produced during chrome plating, causing an explosion.Various windows within the company were destroyed, but nobosy was injured.

A leak occurred at a of a liquid withdrawal valve of a liquid hydrogen storage tank. The hydrogen escaped at the flange between the valve body and the upper part of the valve (flange with tongue and groove). 40 kg of hydrogen were lost.The accidental release was due to the use of bolts different from those prescribed. By using the wrong ones (old bolts), the bolt material was able to flow at the specified tighteningtorque. This meant that there was insufficient tightening torque, which led to a leak.

The accidental hydrogen release occurred when testing the storage system connected to a PEM electrolyzer. The leak test consisted in filling the storage with hydrogen at step-wise increase of pressure. After the step at 3 bar (0.3 MPa), which did not reveal any leak, the storage was pressurised up to 5 bar (0.5 MPa). At that moment a hissing sound occurred from the storage at the outside of the building indicating a leak.

The incident involves a gas booster provided by a manufacturer. This device is used in the experimental platform of the project to raise the pressure in pipelines from 60 to 80 barg (from 6 to 8 MPa), allowing the gas to flow in a close loop. After 5 weeks of operation, a critical gas leakage through the vent port was detected.At the moment of the incident, the compressor was working with a mixture of hydrogen and methane (H2/CH4 blend 20/80 %v/%v). The booster was sent to the manufacturer for inspection and reparation. Severe damage in the seals of the vent port was found.

This incident occurred at the electrolyzer of a refuelling station. An employee of the electrolyzers manufacturer was on-site to conduct a reset of the plant power breaker system and to restart gas generation. Whilst putting the system into generation, a loud bang was heard. By reviewing the station CCTV evidence, a cloud of water vapour was seen being emitted from the oxygen vent line of the electrolyzer container. The gas generation system was safely shut down, and an investigation was started to understand the cause and potential impacts.

The company affected manufactures valves and other hydrogen-storage components, equipment tests. It has offers as well a testing laboratory. The accident happened during testing of a hydrogen tank. A dull bang and a huge pressure wave was felt kilometres away. News report massive damage to the test facility, but a very small fire. Still according to the news, the most probable cause emerging from the investigation is the over-pressuring of the tank due to an erroneous connection of a compressed air hose.

This near miss occurred at the at an airport's hydrogen refilling station. Around 4:30 a.m., the hydrogen detector of the station was triggered and a sound and light alarm were activated. The hydrogen filling station was up in safe mode and the hydrogen storage system isolated. The connection pipes were purged via the vent and the power supply cut off. An on-call technician from the company in charge of managing the station arrived at 6:15 a.m., confirmed that the installation has been made safe and stopped the alarm. The leak was located on the compressors filter.

An in-line inspection of the hydrogen pipeline was being conducted and prior to the last run of the in-line inspection tool (mfl), hydrogen gas was released and ignited from a blind flange connection failure on a temporary separator filter installed at the receiver site. The fire was immediately identified by on-site personnel. There were no injuries. The pipeline section was isolated and de-pressurised to the facility flare. Local emergency responders were dispatched and contained and extinguished the fire. The fire affected the station piping and equipment in the surrounding area.

Early in the morning of (3:00 AM), the personnel on one of the companies on site reported a potential pipeline leak just south of the valve station. The potential leak was discovered due to bubbling water in the ditch. No visible hydrocarbon sheen was noted, indicating a probable non-hydrocarbon gas leak. Later in the morning, the personnel tested their area gas pipelines and determined that their company was not the source of the leak. Later on the same day, another company tested their pipelines and determined that their hydrogen pipeline was the source of the leak.

At 17:30 on 5 may 2019, the pipeline operator was notified by a third party that there was a possible leak on its hydrogen pipeline, as identified by sound. Operator personnel arrived on the site at 18:30 and confirmed that hydrogen was present in the area. The location was in an isolated area. Manual isolation valves were shut to close in the segment and it was manually blown down. At 08:52 on of the day after the operator determined that the incident met reportable criteria and called the national response centre at 09:22.