A novel approach for hazardous area identification of toxic gas leakage accidents on offshore facilities

2020 ◽  
Vol 217 ◽  
pp. 107926
Author(s):  
Dongdong Yang ◽  
Guoming Chen ◽  
Jihao Shi ◽  
Yuan Zhu ◽  
Ziliang Dai
Keyword(s):  
Gas Leakage ◽  
Novel Approach ◽  
Hazardous Area ◽  
Toxic Gas

scholarly journals Evacuation Traffic Management under Diffusion of Toxic Gas Based on an Improved Road Risk Level Assessment Method

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Zheng Liu ◽  
Xingang Li ◽  
Xiaojing Chen
Keyword(s):  
Traffic Management ◽  
Numerical Test ◽  
Assessment Method ◽  
Transmission Model ◽  
Risk Level ◽  
Cell Transmission Model ◽  
Gas Leakage ◽  
Management Models ◽  
Toxic Gas ◽  
Evacuation Traffic

Toxic gas leakage has diffusion characteristics and thus dynamically affects surrounding zones. Most of current evacuation traffic management models set the road risk level as a static value, which is related to the distance to the hazard source, or a dynamic value, which is determined by the toxic gas concentration. However, the toxic gas propagation direction is not considered, and this may lead some evacuees driving from less dangerous regions to higher dangerous regions. To address the shortcomings of traditional evacuation traffic management models, this paper proposes an improved road risk level assessment method based on the difference of the risk levels of upstream and downstream zones of road and develops a safer evacuation traffic management model under the diffusion of toxic gas. The Cell Transmission Model (CTM) is used to depict the evacuation traffic loading process. A numerical test is carried out on Nguyen and Dupuis Network. The test results show that the improved road risk level assessment method can avoid the evacuees driving into higher risk level regions from less dangerous regions.

Numerical Simulation Analysis on Hazardous Area of Oil Gas Leakage and Dispersion in Underground Fuel Depot

2013 ◽  
Vol 827 ◽  
pp. 220-223
Author(s):  
Dong Wang ◽  
Xin Sheng Jiang ◽  
Yi Hong Ou ◽  
Jian Zhong Zhou
Keyword(s):  
Gas Flow ◽  
Simulation Analysis ◽  
Dispersion Model ◽  
Response Strategy ◽  
Dispersion Process ◽  
Factors Affecting ◽  
Gas Dispersion ◽  
Gas Leakage ◽  
Hazardous Area ◽  
Oil Gas

This paper is aimed to show that oil gas dispersion model of underground fuel depot are useful for predicting hazardous areas and choosing emergency response strategy. For this purpose, the factors affecting the dispersion process in the long narrow underground fuel depot are analyzed and the simulation model is put forward. The simulation results agree well with the experimental data and show the effects of oil gas flow rate and concentration on the hazardous areas.

The Analysis for the Environmental Impact of Natural Gas Leakage and Diffusion into the Atmosphere

2011 ◽  
Vol 225-226 ◽  
pp. 656-659
Author(s):  
Qing Min Hou ◽  
Wen Ling Jiao ◽  
Ping Hua Zou
Keyword(s):  
Natural Gas ◽  
Environmental Impact ◽  
Human Body ◽  
Buoyant Jets ◽  
Low Concentration ◽  
Gas Leakage ◽  
Diffusion Characteristics ◽  
Hazardous Area ◽  
Gas Leaks ◽  
And Diffusion

In this paper, we investigate the leakage and diffusion characteristics of natural gas. As results show, when the natural gas leaks from the pipeline, it jet into the atmosphere in the form of positively buoyant jets. As a result, a hazardous area can appear at an altitude of 150m from the ground. Furthermore, the natural gas has a low concentration near the ground, this means the natural gas is less harmful to human body. In addition, the wind should be considered in the transport of leaked natural gas.

scholarly journals Monitor Points Selection in CFD FLACS for Gas Detector Placement

2020 ◽  
Vol 9 (3) ◽  
pp. 3531-3536
Keyword(s):  
Wind Speed ◽  
Wind Direction ◽  
Detection System ◽  
Gas Detection ◽  
Gas Explosion ◽  
Gas Leakage ◽  
Hazardous Area ◽  
Gas Detector ◽  
Detector Placement ◽  
Explosion Cloud

Gas detector first invented was in 1815 to detect the presence of the methane gas and becomes part of a safety system when it is capable to detect the gas leakage and decrease the risk of major accident occurrence. However, the efficiency of the gas detector has been questioned among industry people due to unable to measure the effectiveness of the gas detector quantitatively. Industry people has a problem on how many and where should they locate the gas detector. This study explained the very beginning steps on how to determine the number and location of the gas detector should be installed. This research simulated the gas explosion cloud by using CFD FLACS at highly hazardous area by setting the four parameters with different values of wind speed, wind direction, leak rate and leak direction. In order to optimize the placement of the gas detector, three objectives need to be achieved: 1) to obtain the fastest response time of the gas detector to any gas leakage, 2) to ensure the availability of the gas detection system in worst conditions and 3) to place the gas detector in the potentially hazardous area. The locations of the gas detector meet the objectives based on the approach applied in this study.

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