The event occurred in a university research building dedicated to the study of the take-off of space launchers . An operator gave the alarm during the hydrogen pressure pre-setting phase. he had seen on the video surveillance screen a flame at a pressure regulator on the line located on the walkway above the test hall.

Explosion accident while testing liquid water turbo-pump - A fire occurred during testing of a turbine pump which is a part of a rocket engine. On the day of the incident, seven seconds after the rpm of the pump reached its steady state (45,000 rpm), excessive vibration was detected. The pump was immediately stopped but a loud bang was heard. The operator started to apply nitrogen gas. One and a half minutes after the bang, flames were seen in front of the testing building which came from burning cables. Hydrogen gas discharged from the vent stack on a liquid hydrogen tank also caught fire.

An explosion occurred at testing equipment of a fuel-feeding system for a space rocket engine. According to the original source of this event, now lost, the test envisaged a 42 MPa high-pressure hydrogen gas flow system, an exhaust gas duct outlet was damaged and hydrogen blew out and exploded. High-pressure hydrogen was flowing during the test, and burned not in the burner (a gas generator), but in a silencer tower after flowing through an exhaust gas duct.

A leak of hydrogen gas, followed by an explosion, occurred when an engine was loaded with air, oxygen, and hydrogen, and then started for a preliminary ramjet engine combustion test. The engine was ignited with a fuse head. The test facilities were destroyed,

An explosion occurs during testing of the hydrogen feeding of an engine in the Spatial Agency Centre.

A hydrogen leak occurred on a flange located on a pipe coming from the hydrogen storage tank. The staff was confined and the Internal Operation Plan was launched.Helium was injected in the tank and an operator equipped with a breathing apparatus closed the valve between the tank and the leaking flange. No one was injured and no damages occurred.

An explosion occurred at testing facility of a space rocket engine. The incident occurred when executing a test studying the performance of a hydrogen gas flow measuring system for fuel feeding system of the rocket. During testing of a 42 MPa high-pressure hydrogen gas flow system, an exhaust gas duct outlet was damaged; hydrogen blew out and exploded. Apparently the cause of this accident was the deterioration of the exhaust gas duct outlet by thermal stress.A test started, The hydrogen gas begun flowing.

The last flight of the Space Shuttle Challenger ended 73 seconds after the launch in an explosive burn of hydrogen and oxygen propellants that destroyed the External Tank and exposed the Orbiter to severe aerodynamic loads that caused complete structural breakup. All seven crew members perished.

The accident occurred in a testing site for space equipment. The high pressure combustion took place in a liquid hydrogen tank (H2) under a high pressure and in presence of 12 m (700 kg) of liquid H2. The test was stopped as the malfunction was detected by the sensors, without consequences. The cryogenic tank, with a nominal working pressure of 250 bar was connected to H2 gas and liquid oxygen storage tanks.

The event occurred in a support building at a test stand complex. The explosion destroyed two support buildings and severely damaged a large amount of equipment. No one was injured.Gaseous hydrogen leaked into one of the support buildings from a high pressure hydrogen gas system consisting of two storage tanks and connecting pipes. A location at one pipe had been attacked by galvanic corrosion on the outer wall for some time, thinning the wall. However, the pipe was not routinely under pressure.