Comparison of the Resulting Models of Dispersion of Hazardous Substances Created in the Software Aloha and Terex

Kotkova, Barbora; Hromada, Martin

doi:10.5593/sgem2020/2.1/s07.010

Cited by 1 publication

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“…Khalid et al [20], by using the ALOHA program and quantitative risk calculation approach, evaluated the potential results of jet fire caused by the release of natural gas from pipes at a natural gas power plant in Teluk Gong, Malaysia. Kotkava and Hromada [21] modeled a real methane leakage that happened in 2010 at the old ALSTOM power complex in Brno, Czechia using ALOHA and TerEx programs and compared the results they obtained with the measurement results during the accident. Özay et al [22], with the help of the ALOHA program, modeled the BLEVE scenario that occurred on a liquefied natural gas tanker cruising in the ˙Istanbul Strait and identified the affected areas.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Jet Fire Using Atmospheric Dispersion Modeling (ALOHA): A Case Study of Natural Gas Pipeline in Istanbul, Türkiye

Besiktas,

Baltaci,

Akkoyunlu

2024

Atmosphere

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Natural gas is known as a widely used energy source in residential, business and industrial areas. During the transportation of natural gas by pipelines, accidents occur due to various reasons, which can also lead to gas output. These accidents are events that have the potential to pose important risks in terms of life and property safety, particularly in urban areas and surrounding of pipeline routings. In this study, accident scenarios were generated based on a natural gas distribution pipeline fire that occurred in Istanbul (NW Türkiye) on 28 April 2020 and the impact areas of the jet fire were calculated using the ALOHA program. The effects of source release factors (i.e., pipe length and diameter) and atmospheric conditions (i.e., wind speed, cloud cover, air temperature and relative humidity) on the thermal radiation threat distances associated with jet fire were calculated for the current and worst scenarios. As a result, it was found that pipe length and diameter have a significant effect on threat distances. In addition to the role of the synoptic circulation mechanism on the jet fire for the selected episodic event (position of low/high pressure centers), local atmospheric conditions also have an effect on the threat distance. From the modeling analysis, significant impact of wind speed, air temperature and relative humidity values on the threat distances were found. In the worst scenario, if there were strong northeasterly winds reaching 30.9 m per hour at the time of the jet fire, the threat distances would have been 21 m (red), 28 m (orange) and 42 m (yellow). This case shows that if a natural gas jet fire occurs under the influence of strong northeasterly winds (passing over the Black Sea without encountering any topographic obstacles), poisonous gas will be transported to long distances in a short time and will negatively affect social life and economy.

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Section: Introductionmentioning

confidence: 99%