Eight fire fighters from a combination department injured in a natural gas explosion at a strip mall - Maryland.

2010 ◽  
Keyword(s):  
Natural Gas ◽  
Gas Explosion ◽  
Fire Fighters

scholarly journals Numerical Analysis of the Characteristics of Gas Explosion Process in Natural Gas Compartment of Utility Tunnel Using FLACS

2019 ◽  
Vol 12 (1) ◽  
pp. 153 ◽  
Author(s):  
Zexu Li ◽  
Jiansong Wu ◽  
Mingyu Liu ◽  
Yuntao Li ◽  
Qiuju Ma
Keyword(s):  
Natural Gas ◽  
Gas Explosion ◽  
Rapid Urbanization ◽  
Flame Acceleration ◽  
Natural Gas Pipelines ◽  
Natural Gas Pipeline ◽  
Urban Safety ◽  
Fire And Explosion ◽  
Utility Tunnel ◽  
Urbanization In China

With the rapid urbanization in China, directly buried municipal pipelines have been gradually replaced by urban utility tunnels due to a serious shortage of urban underground spaces and weak disaster prevention of traditional municipal pipelines. The urban utility tunnels normally contain electricity pipelines, natural gas pipelines, heat pipelines, sewer pipelines, etc. If a natural gas pipeline leaks, a fire and explosion might occur and lead to serious consequences. In this study, the characteristics of gas explosion in a natural gas compartment of urban utility tunnel are investigated based on FLACS (Flame Acceleration Simulator) simulations. The results revealed that the flame profile undergoes two unstable flame stages. When the ignition position is set at the middle area (100.25, 1.2, 1.4 m) of the 200 m-long natural gas compartment, the maximum overpressure of the gas explosion in the 200 m-long natural gas compartment is 25.17 bar, which is the largest maximum overpressure under all gas explosion simulation setups. It is also found that the length of the natural gas compartment and different ignition positions have slight effects on the maximum overpressure. This study could provide technical support for structural strength design and division of the fireproofing area of the natural gas compartment in the utility tunnel, which is of great significance to improve urban safety during sustainable development.

Suppression effect of porous media on natural gas explosion in utility tunnels

2022 ◽  
pp. 103522
Author(s):  
Jiansong Wu ◽  
Yimeng Zhao ◽  
Rui Zhou ◽  
Jitao Cai ◽  
Yiping Bai ◽  
...  
Keyword(s):  
Porous Media ◽  
Natural Gas ◽  
Gas Explosion ◽  
Suppression Effect

A Natural Gas Explosion near Waldron, Ind.

1902 ◽  
Vol 10 (8) ◽  
pp. 803-814
Author(s):  
J. F. Newsom
Keyword(s):  
Natural Gas ◽  
Gas Explosion

Case study of a natural gas explosion in Beijing, China

2017 ◽  
Vol 49 ◽  
pp. 401-410 ◽  
Author(s):  
Tingchao Ji ◽  
Xinming Qian ◽  
Mengqi Yuan ◽  
Dan Wang ◽  
Jingjie He ◽  
...  
Keyword(s):  
Natural Gas ◽  
Gas Explosion ◽  
Beijing China

scholarly journals Process of Natural Gas Explosion in Linked Vessels with Three Structures Obtained Using Numerical Simulation

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 52 ◽  
Author(s):  
Qiuhong Wang ◽  
Yilin Sun ◽  
Xin Li ◽  
Chi-Min Shu ◽  
Zhirong Wang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Natural Gas ◽  
Time Pressure ◽  
Combustion Products ◽  
Gas Explosion ◽  
Spherical Vessel ◽  
Flame Acceleration ◽  
Physical Experiments ◽  
Gas Explosions ◽  
Simulation Results

Combinations of spherical vessels and pipes are frequently employed in industries. Scholars have primarily studied gas explosions in closed vessels and pipes. However, knowledge of combined spherical vessel and pipe systems is limited. Therefore, a flame acceleration simulator was implemented with computational fluid dynamics software and was employed to conduct natural gas explosions in three structures, including a single spherical vessel, a single spherical vessel with a pipe connected to it, and a big spherical vessel connected to a small spherical vessel with a pipe. These simulations reflected physical experiments conducted by at Nanjing Tech University. By changing the sizes of vessels, lengths of pipes, and ignition positions in linked vessels, we obtained relevant laws for the time, pressure, temperature, and concentrations of combustion products. Moreover, the processes of natural gas explosions in different structures were obtained from simulation results. Simulation results agreed strongly with corresponding experimental data, validating the reliability of simulation.

Risk Assessment and Field Case Study on Oil/Natural Gas Explosion during High-Pressure Air Injection Process

SPE Journal ◽  
2021 ◽  
pp. 1-14
Author(s):  
Lijuan Huang ◽  
Yu Wang ◽  
Liang Zhang ◽  
Shufeng Pei ◽  
Zhe Zhang ◽  
...  
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Necessary Conditions ◽  
Safety Issue ◽  
Fault Tree Analysis ◽  
Air Injection ◽  
Heavy Oils ◽  
Gas Explosion ◽  
Flammability Limits ◽  
Injection Process

Summary Air injection techniques have been widely applied in oil fields, but the associated safety issue of natural gas (NG) and oil explosion has been of great concern. In this study, explosion experiments of different NG compositions were conducted under high-pressure and high-temperature conditions (up to 15 MPa and 373 K) to reveal the necessary conditions for gas explosion in the air injection process. The experimental results indicate that the lower flammability limits (LFLs) and upper flammability limits (UFLs) of NGs change logarithmically with increasing pressure, which can significantly increase the explosion risk. The rise of temperature can also expand the flammability limit range. Based on the mechanisms and necessary conditions for NG and oil component explosion, fault tree analysis (FTA) models for explosion occurring during the air injection process were proposed that can provide valuable guidelines for designing anti-explosion procedures for field applications. Several explosion incidents that have occurred in air injection operations in different oil reservoirs are described, and the explosion mechanisms are analyzed. NG explosion can occur during air injection when NG is the main component present in the gas phase that can mix with air to form a combustible gas. For heavy oils with little NG, autoignited explosion of vaporized oil components can be the main reason for the incidents during the steam and air coinjection process because the autoignition temperature of heavy oil can be greatly reduced at high pressure.

Numerical study of external explosion characteristics induced by indoor natural gas vented explosion

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lei Pang ◽  
Qianran Hu ◽  
Kai Yang
Keyword(s):  
Natural Gas ◽  
Design Methodology ◽  
Large Scale ◽  
Numerical Study ◽  
Outdoor Environment ◽  
Gas Explosion ◽  
Content Type ◽  
Gas Explosions ◽  
Explosion Overpressure ◽  
Vented Explosion

Purpose The purpose of this paper is to ascertain the harm to personnel and equipment caused by an external explosion during natural gas explosion venting. The external explosion characteristics induced by the indoor natural gas explosion are the focal points of the investigation. Design/methodology/approach Computational fluid dynamics technology was used to investigate the large-scale explosion venting process of natural gas in a 6 × 3 × 2.5 m room, and the characteristics of external explosion under different scaled vent size (Kv = Av/V2/3, 0.05, 0.08, 0.13, 0.18) were numerically analyzed. Findings When Kv = 0.08, the length and duration of the explosion fireball are 13.39 and 450 ms, respectively, which significantly expands the degree and range of high-temperature hazards. The suitable flow-field structure causes the external explosion overpressure to be more than twice that indoors, i.e. the natural gas explosion venting overpressure may be considerably more hazardous in an outdoor environment than inside a room. A specific range for the Kv can promote the superposition of outdoor rupture waves and explosion shock waves, thereby creating a new overpressure hazard. Originality/value Little attention has been devoted to investigating systematically the external explosion hazards. Based on the numerical simulation and the analysis, the external explosion characteristics induced by the indoor large-scale gas explosion were obtained. The research results are theoretically significant for mitigating the effects of external gas explosions on personnel and equipment.

The Damage of Gas Explosion on the Structure

2013 ◽  
Vol 405-408 ◽  
pp. 684-687 ◽  
Author(s):  
Qin Li
Keyword(s):  
Finite Element ◽  
Natural Gas ◽  
Sharp Increase ◽  
Simulation Analysis ◽  
Daily Life ◽  
Paper Analysis ◽  
Living Standard ◽  
Analysis Method ◽  
Gas Explosion ◽  
Element Simulation

With the development of science and technology and the improvement of people's living standard, Natural gas has been widely applied to daily life. But the sharp increase in natural gas explosion accident. In this paper, Analysis of the effects of gas explosion on the structure, and the safety of the structure was evaluated. By detecting the damage phenomena of gas explosion in a civil building, use the characteristics and law of the gas explosion and finite element simulation analysis method.

Sign in / Sign up

Export Citation Format

Share Document