Flammable Gas and Vapor Explosions

2016 ◽  
pp. 2738-2765 ◽  
Author(s):  
Robert Zalosh
Keyword(s):  
Flammable Gas ◽  
Vapor Explosions

Study of Large-Scale Vapor Explosions in Interaction of Fusible Metals with Water

2001 ◽  
Vol 32 (7-8) ◽  
pp. 7
Author(s):  
G. A. Kapinos ◽  
Yu. P. Meleshko ◽  
V. I. Nalivaev ◽  
O. V. Remizov ◽  
S. R. Kharitonov
Keyword(s):  
Large Scale ◽  
Vapor Explosions

scholarly journals Influences of a square and circular vent on gasoline vapor explosions and its propagation: Comparative experimental study

2021 ◽  
pp. 101225
Author(s):  
Chuanyu Pan ◽  
Xishi Wang ◽  
Guochun Li ◽  
Yangpeng Liu ◽  
Yong Jiang
Keyword(s):  
Experimental Study ◽  
Gasoline Vapor ◽  
Vapor Explosions

Nucleation Processes in Large Scale Vapor Explosions

1979 ◽  
Vol 101 (2) ◽  
pp. 280-287 ◽  
Author(s):  
R. E. Henry ◽  
H. K. Fauske
Keyword(s):  
Large Scale ◽  
Interface Temperature ◽  
Liquid Droplets ◽  
Contact Interface ◽  
Vapor Cavity ◽  
Spontaneous Nucleation ◽  
System Pressure ◽  
Nucleation Model ◽  
Vapor Explosions ◽  
Cold Liquid

A spontaneous nucleation model is proposed for the mechanisms which lead to explosive boiling in the free contacting mode. The model considers that spontaneous nucleation cannot occur until the thermal boundary layer is sufficiently thick to support a critical size vapor cavity, and that significant bubble growth requires an established pressure gradient in the cold liquid. This results in a prediction that, for an interface temperature above the spontaneous nucleation limit, large cold liquid droplets will remain in film boiling due to coalescence of vapor nuclei, whereas smaller droplets will be captured by the hot liquid surface and rapidly vaporize, which agrees with the experimental observations. The model also predicts that explosions are eliminated by an elevated system pressure or a supercritical contact interface temperature, and this is also in agreement with experimental data.

Nuclear Power Plant Fires and Explosions: Part IV — Water Hammer Explosion Mechanisms

2017 ◽  
Author(s):  
Robert A. Leishear
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Nuclear Reactor ◽  
Water Hammer ◽  
Compression Process ◽  
Flammable Gas ◽  
Piping Systems ◽  
Fukushima Daiichi ◽  
Accident Conditions

Water hammers, or fluid transients, compress flammable gasses to their autognition temperatures in piping systems to cause fires or explosions. While this statement may be true for many industrial systems, the focus of this research are reactor coolant water systems (RCW) in nuclear power plants, which generate flammable gasses during normal operations and during accident conditions, such as loss of coolant accidents (LOCA’s) or reactor meltdowns. When combustion occurs, the gas will either burn (deflagrate) or explode, depending on the system geometry and the quantity of the flammable gas and oxygen. If there is sufficient oxygen inside the pipe during the compression process, an explosion can ignite immediately. If there is insufficient oxygen to initiate combustion inside the pipe, the flammable gas can only ignite if released to air, an oxygen rich environment. This presentation considers the fundamentals of gas compression and causes of ignition in nuclear reactor systems. In addition to these ignition mechanisms, specific applications are briefly considered. Those applications include a hydrogen fire following the Three Mile Island meltdown, hydrogen explosions following Fukushima Daiichi explosions, and on-going fires and explosions in U.S nuclear power plants. Novel conclusions are presented here as follows. 1. A hydrogen fire was ignited by water hammer at Three Mile Island. 2. Hydrogen explosions were ignited by water hammer at Fukushima Daiichi. 3. Piping damages in U.S. commercial nuclear reactor systems have occurred since reactors were first built. These damages were not caused by water hammer alone, but were caused by water hammer compression of flammable hydrogen and resultant deflagration or detonation inside of the piping.

STUDY OF GAS FUEL LEAKAGE AND EXPLOSION IN THE ENGINE ROOM OF A SMALL LNG-FUELED SHIP

2021 ◽  
Vol 161 (A3) ◽  
Author(s):  
Q G Zheng ◽  
W Q Wu ◽  
M Song
Keyword(s):  
Injury Risk ◽  
Engine Fuel ◽  
Limited Region ◽  
Gas Dispersion ◽  
Engine Room ◽  
Flammable Gas ◽  
Gas Fuel ◽  
Fuel Leakage ◽  
Gas Cloud ◽  
The Given

The engine fuel piping in LNG-fuelled ships’ engine room presents potential gas explosion risks due to possible gas fuel leakage and dispersion. A 3D CFD model with chemical reaction was described, validated and then used to simulate the possible gas dispersion and the consequent explosions in an engine room with regulations commanded ventilations. The results show that, with the given minor leaking of a fuel pipe, no more than 1kg of methane would accumulate in the engine room. The flammable gas clouds only exit in limited region and could lead to explosions with an overpressure about 12 mbar, presenting no injury risk to personnel. With the given major leaking, large region in the engine room would be filled with flammable gas cloud within tens of seconds. The gas cloud might lead to an explosion pressure of about 1 bar or higher, which might result in serious casualties in the engine room.

Cryogenic leakage risk analysis for FLNG and use of brittle crack arresting material as a risk mitigation measure

2015 ◽  
Author(s):  
Akio Usami ◽  
Naohiko Kishimoto ◽  
Hiroki Kusumoto ◽  
Fujio Kaneko ◽  
Takehiro Inoue
Keyword(s):  
Carbon Steel ◽  
Risk Analysis ◽  
Brittle Fracture ◽  
Risk Mitigation ◽  
Brittle Crack ◽  
Cryogenic Fluid ◽  
Mitigation Measure ◽  
Flammable Gas ◽  
Confined Environment

Leakage of cryogenic fluid can bring diverse consequences within confined environment like FLNG. In particular, leakage from pressurized refrigerant system is expected to form cryogenic pool, which could initiate brittle fracture of the structure as well as violent evaporation of flammable gas. The authors put the series of different leakage scenarios under light and quantitatively analyzed the potential consequences in an attempt to provide overall pictures of this hazard yet to have been made clear so far. Further, use of brittle fracture arresting steel – a new strain of carbon steel produced through special TMCP technology – was explored on its potential to mitigate the risk.

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