Abstract
The leakage rate is an essential parameter for the risk assessment and failure analysis of natural gas pipelines. The leakage rate of a natural gas pipeline should be calculated quickly and accurately to minimize consequences. First, in this study, models to estimate the leakage rate of natural gas pipelines are reclassified, and the theoretical range of application for each model is also analysed. Second, the impact of the leakage on the flow rate upstream of the leak point is considered, and the method of successive approximation is used to realize this feedback effect of flow rate change. Then, a modified hole-pipe model is developed to calculate the natural gas leakage rate in this paper. Compared with the leakage rate calculated by the hole-pipe model, the leakage rate calculated by the modified hole-pipe model is smaller and closer to the actual leakage rate due to the consideration of the feedback effect of the flow rate change. Finally, the leakage rate curves of the hole-pipe model and the modified hole-pipe model under different d/D conditions are obtained through simulation. The simulation results show that the modified hole-pipe model is able to calculate the leakage rate of any leak aperture, such as the hole-pipe model, and also at a higher accuracy level than the hole-pipe model.
Highlights
Natural gas is a high-quality, efficient, and clean source of energy
International statistics of natural gas pipeline accidents show that artificial damage, construction errors, material defects, and corrosion are the common causes of natural gas pipeline leakages
Considering how flow rate changes in natural gas pipelines can cause a feedback phenomenon, a modified hole-pipe model is proposed in this paper for calculating the leakage rate of various apertures, and an example is used to verify the superiority and rationality of the models
Summary
Qingmin Hou ,1 Daheng Yang, Xiaoyan Li, Guanghua Xiao, and Siu Chun Michael Ho4. E leakage rate is an essential parameter for the risk assessment and failure analysis of natural gas pipelines. E leakage rate of a natural gas pipeline should be calculated quickly and accurately to minimize consequences. In this study, models to estimate the leakage rate of natural gas pipelines are reclassified, and the theoretical range of application for each model is analysed. En, a modified hole-pipe model is developed to calculate the natural gas leakage rate in this paper. The leakage rate curves of the hole-pipe model and the modified hole-pipe model under different d/D conditions are obtained through simulation. E simulation results show that the modified hole-pipe model is able to calculate the leakage rate of any leak aperture, such as the hole-pipe model, and at a higher accuracy level than the holepipe model The leakage rate curves of the hole-pipe model and the modified hole-pipe model under different d/D conditions are obtained through simulation. e simulation results show that the modified hole-pipe model is able to calculate the leakage rate of any leak aperture, such as the hole-pipe model, and at a higher accuracy level than the holepipe model
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