Vertical gas dispersion from high-pressure pipeline failures:Characterizing hazardous cloud formation in open environmentsOA
This paper examines how natural gas disperses vertically when high-pressure pipelines with large openings fail in unconfined environments,providing insight into hazardous gas cloud development and behavior.A comprehensive study was conducted using a full-scale field experiment(1,219 mm diameter,12 MPa pressure,100 mm aperture)combined with a validated computational fluid dynamics(CFD)numerical simulation model to systematically analyze the coupling effects of pipeline pressure and ambient wind speed.The results indicate that:(1)Pipeline pressure determines the vertical jet scale,where jet height is positively correlated with pressure;at 12 MPa,the maximum jet height reaches 69.4 m(approximately 2.65 times that at 4 MPa),and the lower explosive limit(LEL)cloud area follows a quadratic polynomial trend.(2)Ambient wind speed significantly alters the diffusion trajectory;at a wind speed of 10 m/s,the LEL gas cloud area expands by 1.69 times compared to calm conditions,while the jet height is suppressed to 29.9%of the calm wind value.(3)Our developed dynamic prediction model for the hazardous gas-cloud region achieves a determination coefficient of 0.975 and maintaining prediction errors maintained within approximately 12%.The proposed empirical correlations and dynamic prediction model provide essential quantitative data support for safety-distance design and emergency-response decision-making for high-pressure natural gas pipelines.
Jiahang Li;Shengzhu Zhang;Xu Wang;Xu Cao;Jiashuai Wang;Zongzhi Wu
College of Resources and Safety Engineering,China University of Mining and Technology(Beijing),Beijing,100083,China China Academy of Safety Science and Technology,Beijing,100012,ChinaChina Academy of Safety Science and Technology,Beijing,100012,ChinaChina Academy of Safety Science and Technology,Beijing,100012,ChinaChina Academy of Safety Science and Technology,Beijing,100012,ChinaChina Academy of Safety Science and Technology,Beijing,100012,China China University of Petroleum(Beijing),Beijing,102249,ChinaDepartment of Occupational Health,National Health Commission of the PRC,Beijing,100713,China
能源科技
High-pressure natural gas pipelineLarge-aperture leakageGas jetDiffusionNumerical simulation
《Natural Gas Industry B》 2026 (1)
P.111-127,17
supported by the National Natural Science Foundation of China(Grant No.52574278)the Xinjiang Uygur Autonomous Region Key R&D Program Project(Grant No.2024B01003).
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