TY - JOUR A2 - Wang, Yufei AU - Hou, Qingmin AU - Yang, Daheng AU - Li, Xiaoyan AU - Xiao, Guanghua AU - Ho, Siu Chun Michael PY - 2020 DA - 2020/12/07 TI - Modified Leakage Rate Calculation Models of Natural Gas Pipelines SP - 6673107 VL - 2020 AB - 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. SN - 1024-123X UR - https://doi.org/10.1155/2020/6673107 DO - 10.1155/2020/6673107 JF - Mathematical Problems in Engineering PB - Hindawi KW - ER -