title: A method for simulating the entire leaking process and calculating the liquid leakage volume of a damaged pressurized pipeline.
abstract: The accidental leakage of long-distance pressurized oil pipelines is a major area of risk, capable of causing extensive damage to human health and environment. However, the complexity of the leaking process, with its complex boundary conditions, leads to difficulty in calculating the leakage volume. In this study, the leaking process is divided into 4 stages based on the strength of transient pressure. 3 models are established to calculate the leaking flowrate and volume. First, a negative pressure wave propagation attenuation model is applied to calculate the sizes of orifices. Second, a transient oil leaking model, consisting of continuity, momentum conservation, energy conservation and orifice flow equations, is built to calculate the leakage volume. Third, a steady-state oil leaking model is employed to calculate the leakage after valves and pumps shut down. Moreover, sensitive factors that affect the leak coefficient of orifices and volume are analyzed respectively to determine the most influential one. To validate the numerical simulation, two types of leakage test with different sizes of leakage holes were conducted from Sinopec product pipelines. More validations were carried out by applying commercial software to supplement the experimental insufficiency. Thus, the leaking process under different leaking conditions are described and analyzed.
authors.affiliation: Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Fuxue Road No. 18, Changping District, Beijing 102249, PR China. Electronic address: heguoxicup@163.com.
authors.forename: Guoxi
authors.initials: G
authors.lastname: He
authors.affiliation: Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Fuxue Road No. 18, Changping District, Beijing 102249, PR China. Electronic address: liangyt21st@163.com.
authors.forename: Yongtu
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Fuxue Road No. 18, Changping District, Beijing 102249, PR China.
authors.forename: Yansong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Fuxue Road No. 18, Changping District, Beijing 102249, PR China.
authors.forename: Mengyu
authors.initials: M
authors.lastname: Wu
authors.affiliation: Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Fuxue Road No. 18, Changping District, Beijing 102249, PR China.
authors.forename: Liying
authors.initials: L
authors.lastname: Sun
authors.affiliation: SINOPEC Sales Company South China Branch, Guangzhou 510620, PR China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Xie
authors.affiliation: SINOPEC Beihai Liquefied Natural Gas Limited Liability Company, Beihai 536000, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
keywords: Leakage volume; Leaking coefficients estimation; Leaking process; Long-distance pipeline; Transient flow